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Reattachment of the Osteotomized Greater Trochanter in Hip Surgery Using an Ultrahigh Molecular Weight Polyethylene Fiber Cable: A Multi-Institutional Study 被引量:1
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作者 Seiya Jingushi Tsutomu Kawano +8 位作者 Hirokazu Iida Kenichi Oe Kenji Ohzono Yoshihide Nakamura Makoto Osaki Hidetsugu Ohara Seung Bak Lee Toshihiko Hara Naohide Tomita 《Open Journal of Orthopedics》 2013年第6期283-289,共7页
The purpose of this multicenter study was to evaluate the clinical performance of an ultrahigh molecular weight polyethylene (UHMWPE) fiber cable for re-attachment of the osteotomized greater trochanter in hip surgery... The purpose of this multicenter study was to evaluate the clinical performance of an ultrahigh molecular weight polyethylene (UHMWPE) fiber cable for re-attachment of the osteotomized greater trochanter in hip surgery. Included in the study were 85 hips that had undergone surgery with greater trochanter osteotomy, including 50 hip arthroplasty procedures and 35 hip osteotomies. The osteotomized greater trochanter was reattached using one or more UHMWPE fiber cables. The bone union and displacement of the greater trochanter were assessed in radiographs for up to 12 months after surgery. Non-union of the osteotomy site occurred in 4.7% of the cases. In approximately 90% of the cases, displacement was less than 2 mm at up to 12 months after surgery. The UHMWPE fiber cable was a good biomaterial for reattaching the osteotomized greater trochanter and may also be an option for osteosynthesis procedures. 展开更多
关键词 ultrahigh molecular weight polyethylene fiber CABLE Biomaterials OSTEOSYNTHESIS Greater Trochanter OSTEOTOMY Hip Operations ARTHROPLASTY
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Manufacturing of Ultra-high Molecular Weight Polyethylene Fiber Reinforced Tape and the Loss of Strength
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作者 胡祖明 刘兆峰 《Journal of China Textile University(English Edition)》 EI CAS 1999年第4期92-94,共3页
Due to the low density and excellent mechanical proper-ties,high performance fiber reinforced materials have aconsiderable application in the area of high technologyand dally usage.In this paper,the Ultra-high Molecu-... Due to the low density and excellent mechanical proper-ties,high performance fiber reinforced materials have aconsiderable application in the area of high technologyand dally usage.In this paper,the Ultra-high Molecu-lar Weight Polyethylene(UHMWPE)fiber reinforcedPE tape prepared with the method of powder impregnat-ion was studied.The effect of impregnate length and thetensile force of the yarn on the fiber content as well as on the strength and modulus of the tape were discussed.Calculation shows that the strength and the modulus ofthe ULMWPE fiber can keep about 85% after it undergothe process. 展开更多
关键词 ultra - high molecular weight polyethylene fiber REINFORCED material TAPE IMPREGNATION
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PREPARATION OF MICROPOROUS ULTRA HIGH MOLECULAR WEIGHT POLYETHYLENE (UHMWPE) BY THERMALLY INDUCED PHASE SEPARATION OF A UHMWPE/LIQUID PARAFFIN MIXTURE 被引量:8
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作者 沈烈 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2008年第6期653-657,共5页
Ultra-high molecular weight polyethylene (UHMWPE) with a microporous structure was prepared via thermally induced phase separation (TIPS).Liquid paraffin (LP) was used as a diluent in the preparation of microporous UH... Ultra-high molecular weight polyethylene (UHMWPE) with a microporous structure was prepared via thermally induced phase separation (TIPS).Liquid paraffin (LP) was used as a diluent in the preparation of microporous UHMWPE. Small angle laser light scattering (SALLS) and differential scanning calorimetry (DSC) were used to determine the phase separation temperatures,i.e.the cloud points and the dynamic crystallization temperatures,respectively.It was found that the cloudI points were coincident with the cryst... 展开更多
关键词 ultra high molecular weight polyethylene Thermally induced phase separation Liquid paraffin.
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Structure and Properties of Self-reinforced Material Made from Ultra-high Molecular Weight Polyethylene-montmorillonite Nanocomposite 被引量:3
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作者 WANGQing-zhao LIAOXian-ling LIUZong-lin 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2004年第4期504-510,共7页
High-strength and high-modulus ultra-high molecular weight polyethylene(UHMWPE), named self-reinforced material, was obtained by the elongation of UHMWPE-montmorillonite nanocomposite at melting temperature. According... High-strength and high-modulus ultra-high molecular weight polyethylene(UHMWPE), named self-reinforced material, was obtained by the elongation of UHMWPE-montmorillonite nanocomposite at melting temperature. According to the scanning electron microscope(SEM) analysis, a great deal of fibrillar texture formed in the direction of elongation, and the tensile fractured surface was similar to that of highly oriented fiber. The transmission electron microscope(TEM) and selective area electron diffraction(SAED) analyses reveal that the reinforced phase of the self-reinforced material is an extended chain crystal and its size is about 50_200 nm wide and several microns long, and the montmorillonite layers are broken up to pieces in the size from 100 to 10 nm. The broken layers which have a huge surface area interacting strongly with macromolecules reduces the entanglement density of UHMWPE and induces the chain orientation in flow field. It is supposed that the astriction of montmorillonite layers to polyethylene chains is not only end-tethered but also side-tethered. The differential scan calorimetry(DSC) analysis shows that there are two endothermal peaks for the self-reinforced material, of which the peak at a higher temperature(136.4 ℃) is ascribed to the melting of the reinforced phase. 展开更多
关键词 ultra-high molecular weight polyethylene-montmorillonite nanocomposite ELONGATION Self-reinforced material Properties Structure
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Ultra-High Molecular Weight Polyethylene Tape Applied for Distal Humeral Condyle Fracture around Total Elbow Arthroplasty in Patients with Rheumatoid Arthritis: Report of Two Cases 被引量:1
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作者 Norio Yamamoto Mitsuhiko Takahashi +1 位作者 Naohito Hibino Koichi Sairyo 《Open Journal of Orthopedics》 2015年第9期283-287,共5页
Managing fractures of distal humerus in patients with rheumatoid arthritis (RA) is technically challenging. Total elbow arthroplasty (TEA) is one of the treatment options for these fractures. While elbow motion is lar... Managing fractures of distal humerus in patients with rheumatoid arthritis (RA) is technically challenging. Total elbow arthroplasty (TEA) is one of the treatment options for these fractures. While elbow motion is largely regained by TEA, comminuted condyle fragments are often ignored. Although numerous approaches for repair of condylar fragments around TEA are described, any universal fixation strategy for these fractures has not been established. This report describes, for the first time, application of an ultra-high molecular weight polyethylene (UHMWPE) tape for the treatment of distal humerus fracture in 2 patients with rheumatic elbow arthropathy. The post-operative clinical courses were good. Radiographs showed bony union of the condylar fragments without loosening in two cases. Because of its flat configuration, softness, and flexibility, UHMWPE tape is a promising material for stabilizing fracture of the distal humerus associated with TEA. 展开更多
关键词 Total Elbow ARTHROPLASTY DISTAL HUMERUS ultra-high molecular weight polyethylene RHEUMATOID Arthritis
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PREPARATION AND CHARACTERIZATION OF ULTRA-HIGH MOLECULAR WEIGHT POLY(ETHYLENE TEREPHTHALATE)(PET)FIBER
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作者 章谭莉 胡学超 +1 位作者 谢又乐 严建华 《Journal of China Textile University(English Edition)》 EI CAS 1997年第4期7-12,共6页
This paper reports the spinning and drawing behavior of Ultra-high Molecular Weight polyethylene Terephthalate) (UHMW-PET) fibers. The as-spun fibers were produced by dry-jet wet spinning of a 15%-17% solution in 50:5... This paper reports the spinning and drawing behavior of Ultra-high Molecular Weight polyethylene Terephthalate) (UHMW-PET) fibers. The as-spun fibers were produced by dry-jet wet spinning of a 15%-17% solution in 50:50(v:v) trifluroroacetic acid and dichloromethane. Both molecular weight and polymer solution concentration have marked effect on the drawability of the as-spun-fibers. The maximum extension drawing ratio (EDRmax) of as-spun fiber increases with increasing molecular weight, whereas optimal concentration to achieve the EDRmax of as-spun fibers decreases with increasing molecular weight. Drawing speed and temperature during the first step have remarkable effect on the drawability of these fiber during the second step. Relatively lower drawing temperature and drawing speed (19 ℃ , 60 mm/min) during the first drawing step was beneficial to mechanical properties of ultimate fibers. At the range of 210 ℃ to 230 ℃, the draw ratio (DR) during the second step increases with increasing temperature. 展开更多
关键词 ultra-high molecular weight polyethylene TEREPHTHALATE DRAWING STRENGTH
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Determination and Temperature Dependence of Plateau Modulus for Polymerization of Propylene to Isotactic Polypropylene with Ultra-high Molecular Weight under Catalysis of Ziegler-Natta Catalyst 被引量:1
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作者 DINGJian DINGXue-jia XURi-wei YUDing-sheng 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2005年第2期227-231,共5页
The viscoelastic behavior of isotactic polypropylene with ultra-high molecular weight(UHPPH) and broad molecular weight distribution(MWD), produced in the presence of Ziegler-Natta catalyst, was investigated by means ... The viscoelastic behavior of isotactic polypropylene with ultra-high molecular weight(UHPPH) and broad molecular weight distribution(MWD), produced in the presence of Ziegler-Natta catalyst, was investigated by means of oscillatory rheometry at 180 and 200 ℃, whose loss modulus(G″) plots at 180 and 200 ℃ versus the natural logarithm of angular frequency(ω) present a pronounced maximum at 34.35 and 69.21 rad/s, respectively, and do not show a maximum peak at 0.01-100 rad/s for Ziegler-Natta catalyzing ethylene-propylene random copolymerization(PPR) with a conventional molecular weight and broad MWD. The fact indicates that the high molecular weight is responsible for a maximum peak of G″(ω) vs. lnω curves for UHPPH. This makes it possible to determine the plateau modulus(G 0_N) of UHPPH from a certain experimental temperature G″(ω) curve directly. For UHPPH, the G 0_N determined to be 4.28×10 5 and 3.62×10 5 Pa at 180 and 200 ℃, respectively, decreases with the increase of temperature and is independent of the molecular weight, which directly confirms reputation theoretical prediction that the G 0_N has no relation to the molecular weight. 展开更多
关键词 Isotactic polypropylene ultra-high molecular weight Broad molecular weight distribution Plateau modulus
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Influence of Molecular Weight of Ultra-high Molecular Weight Polyacrylonitrile on Its Rheological Behavior in Dimethylsulfoxide
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作者 沈新元 朱新远 刘永建 《Journal of Donghua University(English Edition)》 EI CAS 2001年第3期7-10,共4页
Ultra-high molecular weight polyacrylonitrile (UHMW PAN ) was prepared by aqueous suspension polymerization, and the effect of molecular weight on its rheological behaviors in dimethylsulfoxide (DMSO) and the spinning... Ultra-high molecular weight polyacrylonitrile (UHMW PAN ) was prepared by aqueous suspension polymerization, and the effect of molecular weight on its rheological behaviors in dimethylsulfoxide (DMSO) and the spinning stability were investigated. It shows that,compared with common polyacrylonitrile (C-PAN),UHMW- PAN/DMS0 solution has smaller non- Newtonian index, larger structural viscosity index, much longer maximum relaxation time, and no first- Newtonian region appears in the flow curves under the same experimental conditions. The explanations for these phenomena are given in the view of chain- entanglements. The optimal technology of preparing UHMW-PAN fibers and hollow fiber membranes could be obtained based on the theological study. 展开更多
关键词 ultra-high molecular weight POLYACRYLONITRILE rheological behavior spinnability.
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Synthesis and properties of ultrahigh molecular weight polyethylene/WS_2 nanoparticle fiber for bullet-proof materials 被引量:6
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作者 MA Tian ZHANG Tao +1 位作者 GAO PengGang ZHANG JianChun 《Chinese Science Bulletin》 SCIE EI CAS 2013年第8期945-948,共4页
Ultrahigh molecular weight polyethylene (UHMWPE)/WS2 nanoparticle fibers were prepared by adding WS2 nanoparticles treated by coupling agent in the precursor solution of UHMWPE. The influence of WS2 nanoparticles on t... Ultrahigh molecular weight polyethylene (UHMWPE)/WS2 nanoparticle fibers were prepared by adding WS2 nanoparticles treated by coupling agent in the precursor solution of UHMWPE. The influence of WS2 nanoparticles on the microstructure and properties of UHMWPE fibers was characterized by SEM, TGA, mechanical property measurement and bullet-shock test. The results showed that WS2 nanoparticles can be uniformly dispersed in the UHMWPE fiber. After incorporating of WS2 nanoparticles, UHMWPE fibers became stiffer and tougher than the pristine ones. Particularly, the modulus of the fiber increased from 1203 to 1326cN/dtex. Furthermore, UHMWPE/WSfibers showed an improved thermal stability. 展开更多
关键词 超高分子量聚乙烯纤维 WS2纳米纤维 力学性能测试 防弹材料 UHMWPE 合成 钛酸酯偶联剂 纳米粒子
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Structural, Pasting, and Thermal Properties of Ultra-high Pressure-treated Lotus Seed Starch 被引量:3
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作者 郭泽镔 陈秉彦 +2 位作者 卢旭 曾绍校 郑宝东 《Chinese Journal of Structural Chemistry》 SCIE CAS CSCD 2014年第4期647-653,共7页
Lotus seed starch (15%, w/w) was subjected to ultra-high pressure (UHP) at 500 MPa for 10~60 min. The effects of UHP on the structural, pasting, and thermal properties of starch were investigated using solid-stat... Lotus seed starch (15%, w/w) was subjected to ultra-high pressure (UHP) at 500 MPa for 10~60 min. The effects of UHP on the structural, pasting, and thermal properties of starch were investigated using solid-state 13C CP/MAS NMR, differential scanning calorimetry (DSC), HPSEC-MALLS-RI, and a rapid visco analyzer. The 13C CP/MAS NMR results revealed a reduction in the relative crystallinity and peak intensity of the crystalline state with increasing the UHP time. The molecular weight of native starch was 1.433 × 107 Da, which was higher than that of the UHP-treated starch. Viscograms of UHP-treated starch revealed an increase in paste viscosity, peak time, and pasting temperature and a reduction in breakdown and setback viscosity compared to the native starch. Furthermore, the DSC results showed a reduction in gelatinization temperature and gelatinization enthalpy with increasing the UHP time. 展开更多
关键词 lotus seed Starch ultra-high pressure molecular weights pasting properties thermal properties
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Optimum Combination of Femoral Head Size, Femoral Head Material, and Acetabular Cup Liner’s Highly-Cross-Linked Polyethylene Brand for Hip Implant
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作者 Gladius Lewis Daniel M. Werdofa 《Journal of Biomedical Science and Engineering》 2015年第1期31-39,共9页
Clinical two-dimensional linear wear rate data for acetabular cup liners fabricated using approved brands of highly cross-linked ultra-high-molecular-weight polyethylene, as reported in 39 articles in the literature, ... Clinical two-dimensional linear wear rate data for acetabular cup liners fabricated using approved brands of highly cross-linked ultra-high-molecular-weight polyethylene, as reported in 39 articles in the literature, were analyzed using a statistical technique called response surface methodology. The output was a series comprising16 acceptable combinations of femoral head diameter (HD), femoral head material (HM), and HXLPE brand (PB), each of which would yield the optimum wear rate (herein taken to be a wear rate of practically zero). An example of such a combination is 28- mm-diameter Oxinium? femoral head articulated against an acetabular cup liner fabricated from ReflectionTM HXLPE. The findings in this work may guide an orthopaedic surgeon’s selection of the combination of HD, HM, and PB to use in a primary total hip joint replacement. 展开更多
关键词 highly-Cross-Linked ultra-high molecular-weight polyethylene ACETABULAR Cup Liner Linear Wear
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Investigation of the Low Molecular Weight Thiol Composition in a Metastatic Prostate Cancer Cell Line (LNCaP) by LC-UV-MS and NMR after Labelling with the Ellman Reagent
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作者 Stephen Childs Nicolas Haroune +1 位作者 Lee Williams Michael Gronow 《American Journal of Analytical Chemistry》 2017年第1期1-18,共18页
The low molecular weight thiols present in the deproteinized extract of a prostate cancer cell line (LNCaP-FGC) were analysed after derivatization with the Ellman reagent (ESSE). The mixed disulphides formed (RSSE) we... The low molecular weight thiols present in the deproteinized extract of a prostate cancer cell line (LNCaP-FGC) were analysed after derivatization with the Ellman reagent (ESSE). The mixed disulphides formed (RSSE) were fractionated, characterized and quantified by liquid chromatography on a C-18 column using UV detection. This revealed the presence, in femtomoles per cell, of glutathione (8.30 ± 0.73), cysteine (2.71 ± 0.04) and cysteinylglycine (0.83 ± 0.10), accounting for the bulk of the thiol present. Further analysis of the cell extracts using a novel and sensitive mass spectrometry technique allowed the detection of low level of an additional derivative which was identified as cysteinylglycerate using NMRspectroscopy. 展开更多
关键词 Prostate Cancer Low molecular weight THIOLS THIOL Analysis ultra-high Performance Liquid Chromatography Novel THIOL LC-MS NMR Ellman’s REAGENT
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Compression Molded Ultra High Molecular Weight Polyethylene-Hydroxyapatite-Aluminum Oxide-Carbon Nanotube Hybrid Composites for Hard Tissue Replacement 被引量:8
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作者 Ankur Gupta Garima Tripathi +1 位作者 Debrupa Lahiri Kantesh Balani 《Journal of Materials Science & Technology》 SCIE EI CAS CSCD 2013年第6期514-522,共9页
Ultra high molecular weight polyethylene (UHMWPE) is widely used for articulating surfaces in total hip and knee replacements. In the present work, UHMWPE based polymer composites were synthesized by synergistic rei... Ultra high molecular weight polyethylene (UHMWPE) is widely used for articulating surfaces in total hip and knee replacements. In the present work, UHMWPE based polymer composites were synthesized by synergistic reinforcing of bioactive hydroxyapatite (HA), bioinert aluminum oxide (Al2O3), and carbon nanotubes (CNTs) using compression molding. Phase and microstructural analysis suggests retention of UHMWPE and reinforcing phases in the compression molded composites. Microstructural analysis elicited variation in densification due to the size effect of the reinforcing particles. The hybrid composites exhibited hardness, elastic modulus and toughness comparable to that of UHMWPE. The interfacial effect of reinforcement phases has evinced the effectiveness of Al2O3 over HA and CNT reinforcements, depicting synergistic enhancement in hardness and elastic modulus. Weak interfacial bonding of polymer matrix with HA and CNT requires utilization of coupling agents to achieve enhanced mechanical properties without deteriorating cytocompatible properties. 展开更多
关键词 Compression molding ultra high molecular weight polyethylene (UHMWPE) HYDROXYAPATITE Aluminum oxide (AI2O3) Carbon nanotubes (CNTs) Nanoindcntation
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Improving the Stab-Resistance Performance of Ultra High Molecular Weight Polyethylene Fabric Intercalated with Nano-Silica-Fluid 被引量:2
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作者 顾隽 黄献聪 +3 位作者 李焱 王新灵 施楣梧 郑震 《Journal of Shanghai Jiaotong university(Science)》 EI 2014年第1期102-109,共8页
High performance fibers impregnated by shear thickening fluids(STFs) have been recognized as a kind of latent stab-resistant materials. In our work, the rheological properties of various nano-silica particles in diffi... High performance fibers impregnated by shear thickening fluids(STFs) have been recognized as a kind of latent stab-resistant materials. In our work, the rheological properties of various nano-silica particles in diffierent carriers were first investigated, some of which showed the typical characteristic of shear thickening phenomena.And then, the effiects of add-on and surface hydrophilicity of silica particles, the type and concentration of the carriers were discussed in detail. It was found that the systems of hydrophilic silica in ethylene glycol, butylenes glycol and polyethylene glycol(PEG) demonstrated shear thickening; moreover, the reversibility of rheological behaviors of hydrophilic silica-PEG300 suspensions indicated energy dissipation existed within a circulation of shear stress. Furthermore, the detail mechanism of STF based nano-silica particles was explored and a process diagram was presented. Finally, the stab-resistance and morphology of cutting edge of ultra high molecular weight polyethylene(UHMWPE) fabric impregnated STF composites were investigated and the results were analyzed.The higher silica add-on was benefit to the improvement of the stab resistance of the composites. 展开更多
关键词 nanoparticle ultra high molecular weight polyethylene(UHMWPE) composite shear thickening stab-resistance
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超高分子量聚乙烯纤维表面改性及其与水性聚氨酯复合粘接性能的研究
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作者 张虹 王贵 +3 位作者 李晓明 李佳辉 邢凌新 裴克梅 《中国胶粘剂》 2025年第1期27-32,共6页
对纤维进行表面改性处理是解决超高分子量聚乙烯(UHMWPE)纤维表面活性较低以及粘接性能问题的重要方法。为解决单独一种改性方法的不足,本研究采用液相氧化法(高锰酸钾法、氢氧化钠法和过氧化氢法)、等离子体处理法以及两者相结合的方... 对纤维进行表面改性处理是解决超高分子量聚乙烯(UHMWPE)纤维表面活性较低以及粘接性能问题的重要方法。为解决单独一种改性方法的不足,本研究采用液相氧化法(高锰酸钾法、氢氧化钠法和过氧化氢法)、等离子体处理法以及两者相结合的方法来对UHMWPE纤维布进行表面改性处理,研究了改性前后纤维的表面分子结构特征、外观形貌以及与水性聚氨酯树脂之间的粘接性能。研究结果表明:(1)通过对比不同液相氧化处理、不同处理时间的峰值载荷和180°剥离强度,可以看出高锰酸钾溶液处理24 h的改性效果相对最好(180°剥离强度最高可达1.28 N/mm,峰值载荷最高可达32.831 N)。这从FT-IR谱图的有关吸收峰得到明显加强以及SEM图的表面粗糙度明显增加可以得到印证。(2)对未处理的UHMWPE纤维布试样条进行等离子体处理,经180 s等离子体处理改性后,180°剥离强度最高可达到1.01 N/mm,峰值载荷最高可达到26.439 N,说明等离子体处理可以明显提升UHMWPE纤维布的表面粘接性能。但过度处理,表面粘接性能会因为形成致密的交联层而下降。(3)经过高锰酸钾液相氧化处理和等离子体共同处理后,180°剥离强度最高可达到2.12 N/mm,峰值载荷最高可达到53.087 N。改性处理后的剥离强度较改性前提高了4倍多,峰值载荷提高了近4倍。高锰酸钾溶液和等离子体共同改性后纤维表面的极性基团和粗糙度明显增加,有效提高纤维与水性聚氨酯基体的粘接性能。 展开更多
关键词 超高分子量聚乙烯纤维 表面改性 水性聚氨酯 粘接
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马坑矿业磁性铁精粉运输仓储防黏料及堵料措施研究
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作者 曾衍寿 《现代矿业》 2025年第1期101-104,110,共5页
福建马坑矿业股份有限公司为了解决铁精粉在运输及仓储过程中存在的易黏料、堵料的问题,在铁精粉物理性质研究的基础上,找出了铁精粉运输及仓储中易黏料、堵料的原因,并针对性地提出了解决措施。通过优化带式输送机的转运溜槽结构、在... 福建马坑矿业股份有限公司为了解决铁精粉在运输及仓储过程中存在的易黏料、堵料的问题,在铁精粉物理性质研究的基础上,找出了铁精粉运输及仓储中易黏料、堵料的原因,并针对性地提出了解决措施。通过优化带式输送机的转运溜槽结构、在铁精粉接触面液压翻板上方铺贴超高分子量聚乙烯板、优化空气炮组安装位置、优化锥斗结构及内衬材料、使用空气炮(低压)清堵系统等措施,有效解决了铁精粉运输及仓储中的黏料、堵料问题,保证了生产的稳定顺行且经济效益显著。 展开更多
关键词 钢结构仓体 超高分子量聚乙烯板 气动助流清堵系统 黏料 堵料
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Optimization of the Production Process of Flash-Spinning UHMWPE Superfine Fiber by Response Surface Methodology 被引量:3
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作者 夏磊 西鹏 程博闻 《Journal of Donghua University(English Edition)》 EI CAS 2011年第2期209-212,共4页
In this paper, statistical optimization method was used to optimize the flash-spinning process conditions. Ultra-high molecular weight polyethylene (UHMWPE) superfine fiber was fabricated by flash-spinning method us... In this paper, statistical optimization method was used to optimize the flash-spinning process conditions. Ultra-high molecular weight polyethylene (UHMWPE) superfine fiber was fabricated by flash-spinning method using UHMWPE as the fiberforming polymer, 1, 2-dichloroethane as the main solvent. The important parameters of the flash-spinning were filtered by Plackett-Burman experimental design based on the single factor experiments. After determining the best regions of the fiber properties, the optimum level of the important parameters were determined by Box-Behnken design. The results of the design showed that the important parameters influencing on the properties of the flash.spinning fiber were spinning temperature, spinning pressure, and spinning solution concentration. The optimum technical parameters were: spinning temperature 186. 4 ~C, spinning pressure 6. 16 MPa, spinning solution concentration 3.06 %. The highest combination property of the flash-spinning fiber was 86.39 under this condition. 展开更多
关键词 flash-spinning ultra-high molecular weight polyethylene (UHMWPE) superfine fiber response surface OPTIMUM
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A Simple Method for Synthesizing Ultra-high-molecular-weight Polystyrene through Emulsion Polymerization Using Alkyl-9-BBN as an Initiator 被引量:1
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作者 Chao Zhao Ryuichi Sugimoto Yusuke Naruoka 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2018年第5期592-597,共6页
Styrene emulsion polymerization using an alkyl-9-BBN, synthesized by reacting 9-BBN(9-borabicyclo-[3.3.1]-nonane) and styrene, in an aqueous sodium dodecyl sulfate(SDS) solution was studied. Ultra-high-molecular-w... Styrene emulsion polymerization using an alkyl-9-BBN, synthesized by reacting 9-BBN(9-borabicyclo-[3.3.1]-nonane) and styrene, in an aqueous sodium dodecyl sulfate(SDS) solution was studied. Ultra-high-molecular-weight(〉 1.0 × 10~7) polystyrene was synthesized using a radical initiator formed through the aerobic oxidation of this alkyl-9-BBN in a high yield(〉 80%). The kinetics of this emulsion polymerization of styrene with the alkyl-9-BBN was investigated. We confirmed that in the initial stage of the polymerization, the initial reaction rate followed first-order kinetics. The activation energy for this emulsion polymerization of styrene was approximately 56.2 kJ/mol. 展开更多
关键词 Emulsion polymerization 9-BBN ultra-high molecular weight polystyrene
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硅酮粉改性超高分子量聚乙烯及其熔体纺丝加工性能 被引量:1
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作者 刘杰 高阳 +2 位作者 秦升学 张弘斌 周海萍 《工程塑料应用》 CAS CSCD 北大核心 2024年第3期28-32,共5页
针对超高分子量聚乙烯(PE-UHMW)熔体加工性能差的问题,应用硅酮粉,采用熔融共混方法对PE-UHMW进行改性,以提高其熔体加工时的流动性。通过扫描电子显微镜与能量色散谱(EDS)表征了硅酮粉在PE-UHMW中的分布,并采用熔体速率测试、旋转流变... 针对超高分子量聚乙烯(PE-UHMW)熔体加工性能差的问题,应用硅酮粉,采用熔融共混方法对PE-UHMW进行改性,以提高其熔体加工时的流动性。通过扫描电子显微镜与能量色散谱(EDS)表征了硅酮粉在PE-UHMW中的分布,并采用熔体速率测试、旋转流变测试,分析了硅酮粉含量对PE-UHMW熔体流动速率与流变性能的影响。对改性后的PE-UHMW采用熔体纺丝法制备了PE-UHMW单丝,并进行了拉伸强度测试。实验结果表明,随着硅酮粉的增加,其分散性逐渐变差,PE-UHMW熔体流动速率随硅酮粉含量先增加后降低,当硅酮粉质量分数达到4%,其熔体流动速率最高,复数黏度与储能模量最低,5%质量分数的硅酮粉在PE-UHMW基体中团聚较明显,改性后的PE-UHMW熔体流动性降低。熔体纺丝实验结果表明改性后的PE-UHMW可以通过普通单螺杆挤出机熔融挤出初生丝,经超倍热拉伸可以制备高强度单丝。当拉伸倍率为36时,质量分数3%的硅酮粉改性PE-UHMW单丝拉伸强度最高,可达1565MPa。因此综合考虑加工性能与单丝强度,采用质量分数3%的硅酮粉改性PE-UHMW较合适。 展开更多
关键词 超高分子量聚乙烯 硅酮粉 熔融共混 熔体纺丝 拉伸强度
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Progressive Failure Analysis of Quasi-isotropic Self-reinforced Polyethylene Composites by Comparing Unsupervised and Supervised Classifications of Acoustic Emission Data
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作者 杨璧玲 黄龙全 梁海先 《Journal of Donghua University(English Edition)》 EI CAS 2014年第4期468-473,共6页
Unsupervised and supervised pattern recognition( PR)techniques are used to classify the acoustic emission( AE) data originating from the quasi-isotropic self-reinforced polyethylene composites,in order to identify the... Unsupervised and supervised pattern recognition( PR)techniques are used to classify the acoustic emission( AE) data originating from the quasi-isotropic self-reinforced polyethylene composites,in order to identify the various mechanisms in the multiangle-ply thermoplastic composites. Ultra-high molecular weight polyethylene / low density polyethylene( UHMWPE / LDPE)composites were made and tested under quasi-static tensile load. The failure process was monitored by the AE technique. The collected AE signals were classified by unsupervised and supervised PR techniques, respectively. AE signals were clustered with unsupervised PR scheme automatically and mathematically. While in the supervised PR scheme,the labeled AE data from simple lay-up UHMWPE / LDPE laminates were utilized as the reference data.Comparison was drawn according to the analytical results. Fracture surfaces of the UHMWPE / LDPE specimens were observed by a scanning electron microscope( SEM) for some physical support. By combining both classification results with the observation results,correlations were established between the AE signal classes and their originating damage modes. The comparison between the two classifying schemes showed a good agreement in the main damage modes and their failure process. It indicates both PR techniques are powerful for the complicated thermoplastic composites. Supervised PR scheme can lead to a more precise classification in that a suitable reference data set is input. 展开更多
关键词 ultra-high molecular weight polyethylene / low density polyethylene(UHMWPE / LDPE) composites THERMOPLASTIC progressive failure analysis damage modes pattern recognition(PR) acoustic emission(AE)
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