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Enhancing surface adhesion of polytetrafluoroethylene induced by two-step in-situ treatment with radiofrequency capacitively coupled Ar/Ar+CH_(4)+NH_(3) plasma
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作者 卢曼婷 何弈 +4 位作者 刘学 黄嘉敏 张佳伟 马晓萍 辛煜 《Plasma Science and Technology》 SCIE EI CAS CSCD 2023年第10期97-104,共8页
Although some progress in plasma modification of the polytetrafluoroethylene(PTFE) surface has been made recently,its adhesion strength still needs to be further improved.In this work,the surface of a PTFE sample was ... Although some progress in plasma modification of the polytetrafluoroethylene(PTFE) surface has been made recently,its adhesion strength still needs to be further improved.In this work,the surface of a PTFE sample was treated with a two-step in-situ method.Firstly,the PTFE surface was treated with capacitively coupled Ar plasma to improve its mechanical interlocking performance;then,Ar+NH_(3)+CH_(4) plasma was used to deposit an a-CNx:H cross-linking layer on the PTFE surface to improve the molecular bonding ability.After treatment,a high specific surface area of 2.20 and a low F/C ratio of 0.32 were achieved on the PTFE surface.Its surface free energy was increased significantly and its maximum adhesion strength reached77.1 N·10 mm^(-1),which is 56% higher than that of the single-step Ar plasma-treated sample and32% higher than that of the single-step Ar+CH_(4)+NH_(3) plasma-treated sample. 展开更多
关键词 adhesion property surface modification capacitively coupled plasma polytetrafluoroethylene(Some figures may appear in colour only in the online journal)
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Antimicrobial Expanded Polytetrafluoroethylene Film Prepared by 3-ray Radiation Induced Grafting of Poly(acrylic acid) 被引量:4
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作者 王运龙 汪谟贞 +2 位作者 吴启超 周晓 葛学武 《Chinese Journal of Chemical Physics》 SCIE CAS CSCD 2015年第1期107-112,I0002,共7页
The simultaneous γ-ray-radiation-induced grafting polymerization of acrylic acid on ex- panded polytetrafluoroethylene (ePTFE) film was investigated. It was found that the degree of grafting (DG) of poly(acrylic... The simultaneous γ-ray-radiation-induced grafting polymerization of acrylic acid on ex- panded polytetrafluoroethylene (ePTFE) film was investigated. It was found that the degree of grafting (DG) of poly(acrylic acid) (PAA) can be controlled by the monomer concentration, absorbed dose, and dose rate under an optimal inhibitor concentration of [Fe2+]=18 mmol/L. SEM observation showed that the macroporous structure in ePTFE films would be covered gradually with the increase of the DG of PAA. The prepared ePTFE-g-PAA film was im- mersed in a neutral silver nitrate solution to fabricate an ePTFE-g-PAA/Ag hybrid film after the addition of NaBH4 as a reduction agent of Ag+ to Ag atom. SEM, XRD, and XPS results proved that Ag nanoparticles with a size of several tens of nanometers to 100 nanometers were in situ immobilized on ePTFE film. The loading capacity of Ag nanoparticles could be tuned by the DG of PAA, and determined by thermal gravimetric analysis. The quart- titative antibacterial activity of the obtained ePTFE-g-PAA/Ag hybrid films was measured using counting plate method. It can kill all the Escherichia coli in the suspension in 1 h. Moreover, this excellent antibacterial activity can last at least for 4 h. This work provides a facile and practical way to make ePTFE meet the demanding antimicrobial requirement in more and more practical application areas. 展开更多
关键词 Expanded polytetrafluoroethylene film Radiation grafting Poly(acrylic acid) Silver nanoparticles Antibacterial property
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Experimental Study of Vacuum Ultraviolet Radiation Effects and Its Synergistic Effects with Atomic Oxygen on a Spacecraft Material-Polytetrafluoroethylene 被引量:5
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作者 赵小虎 沈志刚 +1 位作者 邢玉山 麻树林 《Chinese Journal of Aeronautics》 SCIE EI CAS CSCD 2004年第3期181-186,共6页
Polytetrafluoroethylene (Teflon), a widely used spacecraft material, isstudied to investigate the vacuum ultraviolet (VUV) effects and its synergistic effects with atomicoxygen (AO) in a ground-based simulation facili... Polytetrafluoroethylene (Teflon), a widely used spacecraft material, isstudied to investigate the vacuum ultraviolet (VUV) effects and its synergistic effects with atomicoxygen (AO) in a ground-based simulation facility. The samples before and after the experiments arecompared in appearance, mass, optical properties and surface composition. The reactioncharacteristics of Teflon are summarized and the reaction mechanisms are analyzed. The followingconclusion can be drawn: at the action of VUV the Teflon sample surface is darkened for theaccumulation of carbon; and when the sample is exposed to AO, the carbon is oxidized and thedarkening surface is bleached; the synergistic effects of VUV and AO may cause the erosion of Teflonmore severe. 展开更多
关键词 polytetrafluoroethylene spacecraft material vacuum ultraviolet radiation atomic oxygen synergistic effects ground-based test
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Affinity Adsorption of Bilirubin on Cibacron Blue F3GA-modified Microporous Polytetrafluoroethylene Capillary 被引量:2
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作者 JIN Gu YAO Jian-xia 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2010年第2期323-330,共8页
Bilirubin removal from human plasma was obtained via an affinity microporous polytetrafluoroethylene(MPTFE) capillary. The new adsorbent comprised grafted glycidyl methacrylate(GMA) via radiation-induced polymeriz... Bilirubin removal from human plasma was obtained via an affinity microporous polytetrafluoroethylene(MPTFE) capillary. The new adsorbent comprised grafted glycidyl methacrylate(GMA) via radiation-induced polymerization as hydrophilic coating and reactive sites; ethylenediamine(EDA) as a spacer arm; Cibacron Blue F3GA(CB F3GA) as an affinity ligand; MPTFE capillary as the supporting matrix. The average density of CB F3GA attachment to MPTFE capillaries was found to be 136.5 μmol/g. The capacity of bilirubin adsorbed on affinity MPTFE capillaries is 76.1 mg bilirubin/g polymer(at 25℃). This new adsorbent has advantages over both membrane and traditional micro-column, and this system is stable and easy to operate. The results of blood tests suggest the CB F3GA affinity capillary has good blood compatibility. 展开更多
关键词 Bilirubin removal Radiation grafting Cibacron Blue F3GA polytetrafluoroethylene Microporous capillary
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Composites on Base of the Ultradispersed Polytetrafluoroethylene and Graphite Oxide Intercalated Compounds 被引量:3
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作者 Vitaly I. Saldin Alexander K. Tsvetnikov 《Journal of Materials Science and Chemical Engineering》 2015年第12期12-16,共5页
Composites based on ultradispersed polytetrafluoroethylene and intercalated graphite oxide compounds with dodecahydro-closo-dodecaborates and methods of their fabrication have been developed. The fabricated composites... Composites based on ultradispersed polytetrafluoroethylene and intercalated graphite oxide compounds with dodecahydro-closo-dodecaborates and methods of their fabrication have been developed. The fabricated composites have been characterized using XRD analysis, and optical microscopy. These composites are distinguished with completeness of their combustion, since the combustion products comprise gaseous boron fluorine-containing compounds of boron, boron trifluoride (BF3), and boron oxyfluoride ((BOF)3). Besides, these composites are characterized with increased energy capacity as compared to purely oxygen-containing compounds, since the heat of formation of boron fluorine-containing compounds is higher than that of boron oxide. Introduction of ultradispersed polytetrafluoroethylene imparts composites with hydrophobicity, thus improving their functioning properties. 展开更多
关键词 COMPOSITES Ultradispersed polytetrafluoroethylene Graphite Oxide INTERCALATED COMPOUNDS Dodecahydro-Closo-Dodecaborates Energy-Intensive COMPOSITIONS
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The Application of Polytetrafluoroethylene (PTFE) Fiber Grafted Acrylic Acid as a Cation Exchanger for Removing Cu^(12) 被引量:1
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作者 ZhengPuZHANG ZhiPengWANG +1 位作者 BaoGuiZHANG YanGengZHANG 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第6期609-610,共2页
The polytetrafluoroethylene fiber grafted acrylic acid was used as a cation exchanger. The exchange capacity of the cation fiber is 3.06 mmol/g. The maximum Cu2+ adsorption capacity is 107.48 mg/g. It could be deso... The polytetrafluoroethylene fiber grafted acrylic acid was used as a cation exchanger. The exchange capacity of the cation fiber is 3.06 mmol/g. The maximum Cu2+ adsorption capacity is 107.48 mg/g. It could be desorbed completely by 1mol/L HCl. 展开更多
关键词 polytetrafluoroethylene fiber acrylic acid grafting Cu2+ adsorption.
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Free-radical evolution and decay in cross-linked polytetrafluoroethylene irradiated by gamma-rays 被引量:1
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作者 Fei-Xiang Sha Guo-Jun Cheng +4 位作者 Zi-Yue Xuan Yang Liu Wei-Hua Liu Xiao-Dong Zhang Zhong-Feng Tang 《Nuclear Science and Techniques》 SCIE EI CAS CSCD 2022年第5期113-125,共13页
Electron spin resonance techniques were employed to investigate the effects of the absorbed dose and post-irradiation conditions on the evolution and decay of free-radicals in cross-linked polytetrafluoroethylene(XPTF... Electron spin resonance techniques were employed to investigate the effects of the absorbed dose and post-irradiation conditions on the evolution and decay of free-radicals in cross-linked polytetrafluoroethylene(XPTFE),induced byγ-ray radiation.Chain-end free-radicals,chain alkyl free-radicals,and tertiary alkyl free-radicals were detected when XPTFE was irradiated under Ar atmosphere.The corresponding peroxy free-radicals were formed upon exposure of irradiated XPTFE to air;the freeradicals concentration first increased linearly with increasing absorbed dose and then gradually saturated.The free-radicals yield under air atmosphere was greater than that under Ar,and the peroxy free-radicals were preserved for a relatively long time when irradiated XPTFE was stored under air atmosphere.The chain alkyl free-radicals may be converted to chain end free-radicals byβ-scission,while chain end free-radicals are more sensitive to oxygen than chain alkyl free-radicals.When the annealing temperature was raised above the a-transition temperature of XPTFE,the decay of the free-radicals was greatly affected and accelerated by the motion of the molecules over the long range. 展开更多
关键词 polytetrafluoroethylene Cross-linked polytetrafluoroethylene Electron spinresonance DECAY Radiation c-ray
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Proliferation of endothelial cell on polytetrafluoroethylene vascular graft materials carried VEGF gene plasmid 被引量:3
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作者 TAO Si-feng CHEN Li +3 位作者 ZHENG Yi-xiong XU Yuan CHEN Jian YU Hong 《Journal of Zhejiang University-Science B(Biomedicine & Biotechnology)》 SCIE CAS CSCD 2006年第6期421-428,共8页
Objective: To investigate whether vascular endothelial growth factor (VEGF) gene plasmid carried by polytetrafluoroethylene (PTFE) vascular graft materials could transfect endothelial cells (ECs) and promote th... Objective: To investigate whether vascular endothelial growth factor (VEGF) gene plasmid carried by polytetrafluoroethylene (PTFE) vascular graft materials could transfect endothelial cells (ECs) and promote their growth. Methods: PTFE vascular graft materials carried with pCDI-hVEGF121, pCDI or pEGFP were incubated in Tris-buffer solution and the values of optical density of 260 nm at different time were plotted, then the DNA controlled release curve was made. ECs derived from human umbilical vein were seeded on the pCDI-hVEGF121/pCDI/pEGFP-PTFE materials or tissue culture plates, ECs numbers were counted and VEGF protein concentrations at different time were measured by enzyme-linked immunoadsorbent assay method. Green fluorescent protein (GFP) expression in ECs on pEGFP-PTFE materials was examined with fluorescence mi- croscopy. Results: The controlled release curve showed that the gene released from PTFE materials was rapid within 8 h, then slowed down and that the gene released continuously even after 72 h. At 24, 72 and 120 h, ECs number and proliferation rate of pCDI-hVEGFI21-PTFE materials were higher than those ofpCDI or pEGFP-PTFE materials (P〈0.05). VEGF protein concentration of pCDI-hVEGF121-PTFE materials was higher than that of pC DI or pEGFP-PTFE materials at 6, 24, 72 and 120 h (P〈0.01). GFP expression in ECs on the pEGFP-PTFE materials could be detected by fluorescence microscopy. Conclusion: PTFE graft can be used as a carrier of VEGF gene plasmid, VEGF gene carried by PTFE can transfect ECs and promote ECs growth. 展开更多
关键词 polytetrafluoroethylene Vascular endothelial growth factor Vascular grafts GENE Endothelial cell
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Experimental study on mechanical properties of modified polytetrafluoroethylene
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作者 李运禄 尹建平 刘同鑫 《Journal of Measurement Science and Instrumentation》 CAS CSCD 2015年第4期390-395,共6页
In order to study the mechanical properties of modified low-density polytetrafluoroethylene (PTFE), universal testing machine is used for quasi-static tension and compression tests and Hopkinson bar test is for mech... In order to study the mechanical properties of modified low-density polytetrafluoroethylene (PTFE), universal testing machine is used for quasi-static tension and compression tests and Hopkinson bar test is for mechanical property under impact load. The mechanical properties of the samples with different length-diameter ratios under different impact loads are analyzed and dynamic response characteristics of the modified PTFE at different impact speeds are studied. The results show that, adding the copper powder in PTFE material can increase not only the tensile strength and elongation of the PTFE material sig- nificantly, but also the compressive strength; with the increase of strain rate, the yield strength of modified PTFE increases. 展开更多
关键词 mechanical properties modified polytetrafluoroethylene (PTFE) split Hopkinson pressure bar (SHPB)
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Variations in surface and electrical properties of polytetrafluoroethylene film after plasma-induced grafting of acrylic acid 被引量:2
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作者 Rong Li Xin-Zhong He +5 位作者 Qian-Hong Gao Li-Juan Pang Hong-Long Wang Jiang-Tao Hu Zhe Xing Guo-Zhong Wu 《Nuclear Science and Techniques》 SCIE CAS CSCD 2016年第3期88-95,共8页
Polytetrafluoroethylene(PTFE) film was graftpolymerized with acrylic acid(AAc) via a low-temperature plasma technique.The effect of plasma treatment parameters(radio-frequency power and treatment time) on the spin num... Polytetrafluoroethylene(PTFE) film was graftpolymerized with acrylic acid(AAc) via a low-temperature plasma technique.The effect of plasma treatment parameters(radio-frequency power and treatment time) on the spin number of free radicals in PTFE film was examined.Attenuated total reflection Fourier transform infrared(ATR-FTIR)spectroscopy,X-ray photoelectron spectroscopy,scanning electron microscopy,and atomic force microscopy were employed to characterize the chemical structure,surface composition,and microstructure of the original PTFE and PTFE-g-PAAc films,respectively,in order to verify the successful graft polymerization of AAc onto a PTFE film surface.Thermogravimetric analysis illustrated that the thermal stability of bulk PTFE film remains unchanged after graft modification.Water contact angle measurements confirmed that the hydrophilicity of PTFE-g-PAAc film was effectively improved as compared to the original PTFE film.The dielectric constant(ε_r) of PTFE-g-PAAc(GD =218 μg/cm^2) film remained invariable,compared to that of the unmodified PTFE film.Nevertheless,the dielectric loss(tanδ) of PTFE film increased considerably,from 0.0002(GD = 0μg/cm^2) to 0.0073(GD = 218 μg/cm^2),which might be due to the increase in surface polarity and moisture resulting from AAc graft modification.In addition,the surface electrical resistance(R_s) of PTFE film decreased slightly,from 131.89(GD = 0 μg/cm^2) to 110.28 Ω cm^2(GD = 218μg/cm^2) after surface modification,but still retained its inherent high impedance. 展开更多
关键词 聚四氟乙烯膜 表面组成 接枝聚合 等离子体引发 丙烯酸 导电性能 膨体聚四氟乙烯薄膜 低温等离子体技术
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The Research on Compressive Properties of Polytetrafluoroethylene at High Strain Rate 被引量:1
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作者 Jun-fa ZHANG Yu-tao JU +1 位作者 Chao-xiang SUN Peng-bo WANG 《Defence Technology(防务技术)》 SCIE EI CAS 2013年第3期181-185,共5页
The mechanical behaviors of polytetrafluoroethylene(PTFE)in compressive test performed at different strain rates ranging from 10~2 s^(-1)to10~3 s^(-1)are studied.The experimental results show that the yield strength i... The mechanical behaviors of polytetrafluoroethylene(PTFE)in compressive test performed at different strain rates ranging from 10~2 s^(-1)to10~3 s^(-1)are studied.The experimental results show that the yield strength increases with the increase in strain rate and exhibits a bilinear dependence on the logarithms of the stain rates,but the yield strain decreases with the increase in strain rate.Based on the mathematical model proposed by Nunes and the bilinear relationship between yield strength and strain rate,a modified constitutive model which can describe its complex non-linear mechanical behavior is proposed.The experimental results are in a good agreement with the predicted results of model within 40%of strain. 展开更多
关键词 聚四氟乙烯 高应变率 压缩性能 非线性力学行为 应变速率 屈服强度 数学模型 压缩试验
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Effect of Addition of Polytetrafluoroethylene (PTFE) and Silicon Carbide (SiC) on Properties of Electroless Nickel Alloy Coatings 被引量:1
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作者 WUYu-cheng HUXiao-ye WANGWen.fang HUANGXin-min 《材料热处理学报》 EI CAS CSCD 北大核心 2004年第05B期1102-1105,共4页
Electroless nickel (copper)-phosphorus-silicon carbide (SiC)-polytetrafluoroethylene (PTFE) composite coatings were prepared by adding SiC and PTFE into electroless nickel (copper)-phosphorus alloy baths. The effects ... Electroless nickel (copper)-phosphorus-silicon carbide (SiC)-polytetrafluoroethylene (PTFE) composite coatings were prepared by adding SiC and PTFE into electroless nickel (copper)-phosphorus alloy baths. The effects of addition of SiC and PTFE on depositing rate, microhardness, wear resistance and anti-friction of the resulted composite coatings were studied. The results indicated that electroless nickel (copper)-phosphorus alloy coatings were greatly improved in depositing rate, microhardness, wear resistance and antifriction by co-deposited proper amount of SiC and PTFE. 展开更多
关键词 非电解淀积 聚四氟乙烯 碳化硅 镍合金
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Preparation and Selectivity of Molecularly Imprinted Polymer Coating on the Micro Pore Membrane of Polytetrafluoroethylene
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作者 Hong Sheng GUO, Yu Mei JIA, Xi Wen HEState Key Laboratory of Functional Polymer Materials for Adsorption and Separation,Department of Chemistry, Nankai University, Tianjin 300071 The College of Pharmaceuticals and Biotechnology, Tianjin University, Tianjin 300072 《Chinese Chemical Letters》 SCIE CAS CSCD 2003年第9期979-982,共4页
In order to obtain mechanically stable membrane for practical application, the imprinted polymer was synthesized in the pores of polyfluoromembrane, the binding and transport ability of the membrane were studied.
关键词 Molecular imprinting TRIMETHOPRIM membrane of polytetrafluoroethylene.
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Dependence of Mechanical Performance of Polytetrafluoroethylene Filament on Elongation of Dispersion Particles
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作者 YANG Bin XU Yukang JIN Xiangyu 《Journal of Donghua University(English Edition)》 EI CAS 2019年第2期187-191,共5页
The effect of elongation of particles in dispersion powders on mechanical performance of polytetrafluoroethylene(PTFE)flat filament is analyzed.Morphology and elongation of particles in four different PTFE dispersion ... The effect of elongation of particles in dispersion powders on mechanical performance of polytetrafluoroethylene(PTFE)flat filament is analyzed.Morphology and elongation of particles in four different PTFE dispersion powders are analyzed.Meanwhile,the correlation between elongation and diameter of dispersion particles is discussed.Strength-elongation curves of PTFE flat filaments made of four different dispersion powders are obtained from measurements of mechanical behaviors.Experimental results show that PTFE flat filament manufactured with dispersion particles having appropriate elongation(0.55-0.60)shows excellent mechanical performance.This work could be regarded as a reference for manufacturing high performance PTFE flat filaments. 展开更多
关键词 polytetrafluoroethylene(PTFE) FILAMENT particle ELONGATION mechanical performance
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Effects of Stretching Parameters on Morphological and Mechanical Properties of Polytetrafluoroethylene Filaments
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作者 徐玉康 朱尚 +2 位作者 张寅江 黄晨 靳向煜 《Journal of Donghua University(English Edition)》 EI CAS 2017年第2期293-297,共5页
Comprehensive performances of polytetrafluoroethylene(PTFE) flat filaments used as suture materials in medical field can be affected significantly by morphological and mechanical characteristics.Due to low tensile str... Comprehensive performances of polytetrafluoroethylene(PTFE) flat filaments used as suture materials in medical field can be affected significantly by morphological and mechanical characteristics.Due to low tensile strength and non-uniform morphology,PTFE flat filaments cannot be applied widely as medical sutures.In order to solve flaws above,PTFE flat filaments with constant linear density,550 dtex,are manufactured and dependences of morphology,frictional features and mechanical behaviors on stretching ratio and temperature are also analyzed.The results indicate that PTFE flat filaments with high tensile strength(1 922.0 cN) and excellent apparent performance can be manufactured at optimal stretching ratio and temperature,18.0 and350 ℃,respectively. 展开更多
关键词 medical materials polytetrafluoroethylene(PTFE) flat filament tensile strength frictional coefficients stretching process
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Influence of external load on friction coefficient of Fe-polytetrafluoroethylene
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作者 Xiu-Hong Hao Deng Pan +3 位作者 Ze-Yang Zhang Shu-Qiang Wang Yu-Jin Gao Da-Peng Gu 《Chinese Physics B》 SCIE EI CAS CSCD 2020年第4期397-404,共8页
A coarse-grained molecular dynamics simulation model was developed in this study to investigate the friction process occurring between Fe and polytetrafluoroethylene(PTFE).We investigated the effect of an external loa... A coarse-grained molecular dynamics simulation model was developed in this study to investigate the friction process occurring between Fe and polytetrafluoroethylene(PTFE).We investigated the effect of an external load on the friction coefficient of Fe–PTFE using the molecular dynamics simulations and experimental methods.The simulation results show that the friction coefficient decreases with the external load increasing,which is in a good agreement with the experimental results.The high external load could result in a larger contact area between the Fe and PTFE layers,severer springback as a consequence of the deformed PTFE molecules,and faster motion of the PTFE molecules,thereby affecting the friction force and normal force during friction and consequently varying the friction coefficient. 展开更多
关键词 FRICTION polytetrafluoroethylene(PTFE) COARSE-GRAINED MOLECULAR DYNAMICS LOAD
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Composites on Base of the Ultradispersed Polytetrafluoroethylene and Chitosan Salts
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作者 Vitaly I. Saldin Alexander K. Tsvetnikov 《Journal of Materials Science and Chemical Engineering》 2016年第12期22-28,共7页
Composites based on ultradispersed polytetrafluoroethylene and chitosan salts (nitrate, perchlorate and dodecahydro-closo-dodecaborate) and methods of their fabrication have been developed. For this purpose, the ultra... Composites based on ultradispersed polytetrafluoroethylene and chitosan salts (nitrate, perchlorate and dodecahydro-closo-dodecaborate) and methods of their fabrication have been developed. For this purpose, the ultrasonic effect on the mixture of the aqueous gels of chitosan salts with dry UPTHE or UPTFE ethanol dispersion with propeller agitators. Introduction of ultradispersed polytetrafluoroethylene improving their functioning properties, namely high combustion efficiency and resistance to air moisture. 展开更多
关键词 COMPOSITES Ultradispersed polytetrafluoroethylene CHITOSAN Chitosan Nitrate PERCHLORATE Dodecahydro-Closo-Dodecaborate Graphite Oxid Ultrasonic Treatment COMPOSITES XRD IR
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Effect of Expanded Polytetrafluoroethylene Combined with Autologous Ear Cartilage in Nasal Plastic Surgery
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作者 Jinqing Xie Zhiqiang Wang 《Journal of Clinical and Nursing Research》 2021年第2期62-65,共4页
Objective:To explore the effect of combined application of expanded polytetrafluoroethylene and autologous ear cartilage in nasal plastic surgery.Methods:76 cases of nasal plastic surgery patients in our hospital from... Objective:To explore the effect of combined application of expanded polytetrafluoroethylene and autologous ear cartilage in nasal plastic surgery.Methods:76 cases of nasal plastic surgery patients in our hospital from September 2019 to September 2020 were selected as the research objects and divided into experimental group(38 cases,treated with expanded polytetrafluoroethylene+autologous ear cartilage surgery)and control group(38 cases,treated with autologous ear cartilage surgery).The treatment effect,appearance score and complications were compared.Results:The total effective rate of the experimental group(97.37%,37/38)was higher than that of the control group(78.95%,30/38),P<0.05;After treatment,the appearance score of the experimental group was(8.97±0.37),which was significantly higher than that of the control group(P<0.05);The total incidence of complications in the experimental group(5.26%,2/38)was significantly lower than that in the control group(21.05%,8/38),P<0.05.Conclusion:In the process of nasal plastic surgery,the combined application of autologous ear cartilage surgery and expanded polytetrafluoroethylene has obvious effect,improves the appearance of patients,and has less postoperative complications,which is worthy of promotion. 展开更多
关键词 Expanded polytetrafluoroethylene Autogenous auricular cartilage Nose plastic surgery EFFECT
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聚四氟乙烯材料切削工艺和应用研究进展
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作者 倪敬 崔智 +2 位作者 何利华 付新 朱泽飞 《中国机械工程》 EI CAS CSCD 北大核心 2024年第3期498-514,共17页
聚四氟乙烯(polytetrafluoroethylene,PTFE)因其优异的物理化学性能而成为生产制造电子通信、航空航天等领域关键零部件的重要材料。相比模压烧结工艺,切削工艺能够更高效地加工结构较为复杂的PTFE零部件。然而,PTFE材料具有韧性强、回... 聚四氟乙烯(polytetrafluoroethylene,PTFE)因其优异的物理化学性能而成为生产制造电子通信、航空航天等领域关键零部件的重要材料。相比模压烧结工艺,切削工艺能够更高效地加工结构较为复杂的PTFE零部件。然而,PTFE材料具有韧性强、回弹性高、导热性差和线膨胀系数大等特点,使得其切削加工质量难以保证,在一些特殊领域,对PTFE零部件的表面洁净度更是有极高的要求,这些都对PTFE材料的切削工艺提出了新的挑战。从PTFE材料的基础力学和物理化学等特性出发,总结了PTFE材料的切削加工性;结合聚合物切削理论及其研究方法分析了PTFE材料的切削去除机理;阐述了PTFE及其复合材料的车、铣、钻等切削加工工艺;最后概述了PTFE材料切削工艺在相关重要领域的应用现状,并从材料性能研究、基础切削理论研究、切削工艺探索等方面总结了现有研究和应用中存在的问题,对未来研究的发展趋势和研究重点进行了展望。 展开更多
关键词 聚四氟乙烯 切削机理 切削工艺 力学性能
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聚四氟乙烯膜的超疏水改性及应用研究进展
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作者 李成才 朱登辉 +1 位作者 朱海霖 郭玉海 《纺织学报》 EI CAS CSCD 北大核心 2024年第8期65-71,共7页
超疏水聚四氟乙烯膜材料具有突出的化学稳定性、高耐热性、强疏水性和高断裂韧性等优点,在膜分离技术领域中广泛应用。为开发高效、低成本、耐久稳定、绿色环保的超疏水改性技术,根据聚四氟乙烯膜的超疏水改性原理,从聚四氟乙烯分子化... 超疏水聚四氟乙烯膜材料具有突出的化学稳定性、高耐热性、强疏水性和高断裂韧性等优点,在膜分离技术领域中广泛应用。为开发高效、低成本、耐久稳定、绿色环保的超疏水改性技术,根据聚四氟乙烯膜的超疏水改性原理,从聚四氟乙烯分子化学结构出发,分析了2种改性机制“不改变聚四氟乙烯的化学结构”和“改变聚四氟乙烯的化学结构”,介绍了超疏水聚四氟乙烯膜材料制备和改性中的优缺点,阐述了超疏水聚四氟乙烯膜材料的功能性应用形式和领域,最后探讨了超疏水聚四氟乙烯膜材料目前存在的问题及未来发展的方向,以期为高性能超疏水聚四氟乙烯膜材料的进一步研究提供参考。 展开更多
关键词 分离膜材料 聚四氟乙烯膜 超疏水 改性方法 分离技术
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