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Fabrication of a novel poly(dimethylsiloxane) microchips with two sharpened stretching tips 被引量:2
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作者 Chun Ye Liu Xu Xu +1 位作者 Hong Jun Gao Jie Rong Chen 《Chinese Chemical Letters》 SCIE CAS CSCD 2007年第2期221-224,共4页
An integrated poly(dimethylsiloxane) (PDMS) microchip with two sharpened stretching has been presented. The sample was directly introduced into the separation channel through the stretching inlet tip without complicat... An integrated poly(dimethylsiloxane) (PDMS) microchip with two sharpened stretching has been presented. The sample was directly introduced into the separation channel through the stretching inlet tip without complicated power switching supplies and without injection cross-channel. Operations of running buffer refreshing or channel cleaning also becomes simple by vacuumed in one end and placed another tip into solution vial. The fabrication method can be easily applied in most analytical laboratories at low cost in the absence of soft lithography and plasma bonding equipments. Characteristics of the chips were tested and it can be used to separate fluorescence labeled molecules. 展开更多
关键词 poly(dimethylsiloxane) MICROCHIP ELECTROPHORESIS Sample injection
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Pervaporation Characteristics in Removal of Benzene from Water through Polystyrene-Poly (Dimethylsiloxane) IPN Membranes 被引量:2
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作者 Tadashi Uragami Iusaku Sumida +3 位作者 Takashi Miyata Tadashi Shiraiwa Hiroshi Tamura Tatsuo Yajima 《Materials Sciences and Applications》 2011年第3期169-179,共11页
This paper focuses on the effects of the PSt content of polystyrene (PSt)-poly (dimethylsiloxane) (PDMS) interpenetrateing network (IPN) polymer membranes, on the pervaporation (PV) characteristics during the removal ... This paper focuses on the effects of the PSt content of polystyrene (PSt)-poly (dimethylsiloxane) (PDMS) interpenetrateing network (IPN) polymer membranes, on the pervaporation (PV) characteristics during the removal of benzene from an aqueous solution of dilute benzene. When an aqueous solution of 0.05wt% benzene was permeated through the PSt-PDMS IPN membranes, they showed high benzene/water selectivity. Both the permeability and the benzene/water selectivity of the membranes were enhanced with increasing PSt content in the PSt-PDMS IPN membrane. The physicochemical mechanism of permeation and separation through the PSt-PDMS IPN membranes during PV is also discussed. The best normalized permeation rate, separation factor for benzene selectivity, and PV separation index of the PSt-PDMS IPN membrane were 1.27 × 10-6 kgm (m2hr)-1, 3293, and 41821, respectively. These PV characteristics are discussed from the viewpoint of the chemical and physical structure of the PSt-PDMS IPN membranes. 展开更多
关键词 Interpenetrating Network polymer polySTYRENE poly (dimethylsiloxane) PERVAPORATION REMOVAL of BENZENE
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Operational Model for Evaluating the Permeation of Mixed Gas Through Poly(dimethylsiloxane) Membrane 被引量:1
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作者 武法文 李磊 +2 位作者 徐志红 谭淑娟 张志炳 《Chinese Journal of Chemical Engineering》 SCIE EI CAS CSCD 2006年第5期700-707,共8页
An operational model is developed to evaluate and predict the permeation performance of mixed gas through poly(dimethylsiloxane) (PDMS) membranes by combining the ideal gas permeation model with the ex-perimental anal... An operational model is developed to evaluate and predict the permeation performance of mixed gas through poly(dimethylsiloxane) (PDMS) membranes by combining the ideal gas permeation model with the ex-perimental analysis of the mixed gas transport character. This model is tested using the binary and ternary mixed gas with various compositions through the PDMS membranes, and the predicted data of the permeation flux and the compositions of the permeated gas are in good agreement with the experimental ones, which indicates that the op-erational model is applicable for the evaluation of the permeation performance of mixed gas through PDMS mem-branes. 展开更多
关键词 operational model poly (dimethylsiloxane membrane mixed gas permeation performance
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CONFIGURATION-DEPENDENT PROPERTIES OF POLY(DIMETHYLSILOXANE) CHAIN
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作者 章林溪 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 1999年第4期347-354,共8页
The intermolecular rotational potential energies for poly(dimethylsiloxane) (PDMS) chains are directly obtained from a priori probability P-alpha beta. Here the differing statistical weight matrices for the Si-O and O... The intermolecular rotational potential energies for poly(dimethylsiloxane) (PDMS) chains are directly obtained from a priori probability P-alpha beta. Here the differing statistical weight matrices for the Si-O and O-Si bonds are considered in calculating the configuration partition function. In the Bahar's model, as the same statistical weight matrices for the Si-O and O-Si bonds are adopted, there exists a large deviation of a priori probability P-alpha beta between the theory and the molecular dynamics (MD) simulation. Our model gives satisfactory agreement with experiment on the mean-square unperturbed end-to-end distance, the mean-square dipole moment and its temperature dependence, and the molar cyclization equilibrium constants for dimethylsiloxane oligomers. This new rotational isomeric state approach can be widely applied to other chains; such as -CH2-C[(CH2)(m)H](2)- and -O-Si[(CH2)(m)H](2) for arbitrary m. 展开更多
关键词 poly(dimethylsiloxane) configuration property A priori propability
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Mechanical, Thermal and Morphology Properties of Thermoplastic Polyurethane Copolymers Incorporating α,ω-Dihydroxy-[poly(propyleneoxide)-poly (dimethylsiloxane)-poly(propyleneoxide)] of Varying Poly(propyleneoxide) Molecular Weight
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作者 Zeliang Dai Kai Yang Qingzhi Dong 《Open Journal of Synthesis Theory and Applications》 2015年第3期41-57,共17页
Novel segmented thermoplastic polyurethane (TPU) copolymers were synthesized using two-step solventless bulk polymerization. 4,4’-methylenediphenyl diisocyanate (MDI) and 1,4-Butanediol (BDO) were used to form hard s... Novel segmented thermoplastic polyurethane (TPU) copolymers were synthesized using two-step solventless bulk polymerization. 4,4’-methylenediphenyl diisocyanate (MDI) and 1,4-Butanediol (BDO) were used to form hard segment of TPU and α,ω-dihydroxy-[poly(propyleneoxide)-poly (dimethylsiloxane)-poly(propyleneoxide)] (α,ω-dihydroxy-(PPO-PDMS-PPO)) was used to form soft segment of TPU, where the molar ratio of the –N=C=O/OH was 1.02 and the hard segment weight percentage was 30%. A series of TPUs were characterized by fourier transform infrared spectroscopy (FT-IR). The investigation of triblock oligomer’s PPO molecular weight impact on the derived TPU’s mechanical properties, thermal performance, surface water repellency and morphology performance was carried by Instron material tester, thermogravimetric analysis (TGA), differential scanning calorimetry (DSC), water contact angles (WCA), scanning electron microscope and energy dispersive X-ray spectroscopy (SEM-EDX) and wide angle X-ray diffraction (WAXD), respectively. FT-IR confirmed α,ω-dihydroxy-(PPO-PDMS-PPO) well cooperating into urethane structure and analyzed hydrogen bonding between N-H group with hard segment C=O group and N-H group with soft segment C-O-C group. DSC and WAXD results showed α,ω-dihydroxy-(PPO-PDMS-PPO) segments crystallization. SEM-EDX results showed that the presence of a spherulitic morphology, which arose from the crystallization of the PPO segments. The thermal properties measured by TGA and DSC were slightly affected by molecular weight of PPO and microphase separation. The weight loss of TPUs started between 294°C and 300°C, and Tg was in the range of -70°C to -107°C. TPU copolymers’ surface hydrophobicity property was excellent with WCA range of 95°?to 112°. TPU-3 with 1000 molecular weight PPO has the optimized mechanical properties with tensile strength 16.4 MPa and the modulus at 100% elongation 6.2 MPa and elongation 398%. 展开更多
关键词 Thermoplastic polyurethane COpolyMERS MECHANICAL Properties THERMAL Performance HYDROPHOBICITY Property MORPHOLOGY α ω-Dihydroxy-[poly(propyleneoxide)-poly(dimethylsiloxane)-poly(propyleneoxide)]
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A Flexible Pressure Sensor Based on Poly(dimethylsiloxane) Nanostructures Film
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作者 Man Zhang Liangping Xia +3 位作者 Suihu Dang Lifang Shi Axiu Cao Chunlei Du 《Journal of Microelectronic Manufacturing》 2019年第3期7-12,共6页
This paper proposed a flexible pressure sensor based on poly(dimethylsiloxane) nanostructures film and report an efficient,simple,and low-cost fabrication strategy via soft nanoimprint lithography.The pressure sensor ... This paper proposed a flexible pressure sensor based on poly(dimethylsiloxane) nanostructures film and report an efficient,simple,and low-cost fabrication strategy via soft nanoimprint lithography.The pressure sensor can convert external pressure or mechanical deformation into electrical signal to detect pressure and strain changes based on the coupling of triboelectrification and electrostatic induction.To enhance the performance of the pressure sensor,it consists of sub-500 nm resolution on the surface of elastic poly(dimethylsiloxane) sensitive layer and an indium tin oxide electrode thin film.When the pressure applied on the nanostructures layer,triboelectrostatic charges are induced.In the experiment,it measures up to sensitivity of 0.8 V/kPa at frequency of 5 Hz.This study results in potential applications such as wearable smart devices and skin-attachable diagnostics sensing systems. 展开更多
关键词 FLEXIBLE pressure sensor poly(dimethylsiloxane) soft NANOIMPRINT lithography triboelectrostatic CHARGES
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微纳层叠技术对ACM/PP热塑性弹性体性能的影响
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作者 杨帆 罗讴阳 +3 位作者 李明谦 劳志超 阎华 马秀清 《塑料》 CAS CSCD 北大核心 2024年第3期88-92,98,共6页
采用微纳层叠共挤出技术制备了ACM/PP热塑性硫化胶(TPV),研究了动态硫化温度、橡塑比、相容剂含量、炭黑与增塑剂含量对TPV力学性能与耐油性能的影响。结果表明,当动态硫化温度为190℃时,TPV具有较好的力学性能,拉伸强度、断裂伸长率、... 采用微纳层叠共挤出技术制备了ACM/PP热塑性硫化胶(TPV),研究了动态硫化温度、橡塑比、相容剂含量、炭黑与增塑剂含量对TPV力学性能与耐油性能的影响。结果表明,当动态硫化温度为190℃时,TPV具有较好的力学性能,拉伸强度、断裂伸长率、硬度、压缩永久变形分别为12.83 MPa、104.67%、86.50%、50.00%;随着TPV橡塑比的增大,材料的拉伸强度、断裂伸长率、硬度、耐油性能明显降低;当相容剂PP-g-MAH(马来酸酐接枝聚丙烯)的含量为15份时,TPV的综合力学性能与耐油性能最佳;TPV的拉伸强度、压缩永久变形、硬度随炭黑含量的增加而升高,随增塑剂DOTP含量的增加而降低,TPV的耐油性随炭黑含量的增加而提高,随DOTP含量的增加而变差,TPV的断裂伸长率随炭黑与DOTP含量的增加而降低。 展开更多
关键词 微纳层叠 热塑性弹性体 丙烯酸酯橡胶 聚丙烯 耐油性能
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A robust mechanochromic self-healing poly(dimethylsiloxane)elastomer
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作者 ZHAO KaiFeng LV Chi ZHENG JunPing 《Science China(Technological Sciences)》 SCIE EI CAS CSCD 2020年第5期740-747,共8页
Simultaneously introducing mechanochromic and self-healing properties into polymers is almost a field unexplored,and the integration of these capabilities in one material has important theoretical and substantial sign... Simultaneously introducing mechanochromic and self-healing properties into polymers is almost a field unexplored,and the integration of these capabilities in one material has important theoretical and substantial significance.In this paper,a mechanochromic poly(dimethylsiloxane)(PDMS)elastomer with self-healing ability and superior mechanical properties is first reported.Spiropyran mechanophore and reversible hydrogen bonds are incorporated into the system to realize multi-stimuliinduced color change and self-healing ability,respectively.Upon uniaxial stretching,heating or UV irradiation,the elastomer exhibits a reversible color variation from yellow to purple,which can recover rapidly by white light illumination.Its excellent tensile strength(10.5 MPa)and elongation at break(785%)are distinctive among PDMS elastomers with no fillers.After heat treatment at 60℃for 24 h,the self-healing efficiency of strength can achieve 92.1%.This novel robust PDMS elastomer holds great promise for applications in visualized stress/strain sensing,self-healing biomaterials and wearable devices. 展开更多
关键词 mechanochromic SELF-HEALING poly(dimethylsiloxane)elastomer
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辐射降温聚烯烃纳米纤维膜的制备及其性能
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作者 昌康琪 罗梦颖 +2 位作者 赵青华 王栋 李沐芳 《纺织学报》 EI CAS CSCD 北大核心 2024年第7期24-30,共7页
为提高纳米纤维防护材料的热湿舒适性,利用乙烯-辛烯共聚弹性体(POE)和醋酸丁酸纤维素酯(CAB)为原料,通过熔融共混相分离法制备了辐射降温POE纳米纤维膜,并与乙烯醇-乙烯共聚物(PVA-co-PE)纳米纤维膜、棉织物进行对比,研究其形态结构、... 为提高纳米纤维防护材料的热湿舒适性,利用乙烯-辛烯共聚弹性体(POE)和醋酸丁酸纤维素酯(CAB)为原料,通过熔融共混相分离法制备了辐射降温POE纳米纤维膜,并与乙烯醇-乙烯共聚物(PVA-co-PE)纳米纤维膜、棉织物进行对比,研究其形态结构、红外辐射透过率、降温效果及透湿性。结果表明:POE纳米纤维膜的形态均匀,平均直径为570 nm,其直径及孔径均大于PVA-co-PE纳米纤维膜;POE纳米纤维膜的中红外辐射(7~14μm)透过率接近100%,且随着纳米纤维膜厚度的增加而明显下降。与之对比,PVA-co-PE纳米纤维膜在相应波段的透过率有所下降,而棉织物完全不能透过中红外光;POE纳米纤维膜具有更好的红外辐射降温效果,将其覆盖在加热模块表面后,真空条件下模块温度保持不变,室温条件下模块温度仅升高0.5℃;此外,POE纳米纤维膜表现出良好的透湿性,其透湿率为2845 g/(m 2·d),略低于棉织物的(3530 g/(m 2·d));将POE纳米纤维作为涂层材料涂覆在棉织物表面构筑复合防护膜,可提升棉织物的过滤阻隔性能,且不影响其热湿舒适性。 展开更多
关键词 乙烯醇-乙烯共聚物 乙烯-辛烯共聚弹性体 聚烯烃纳米纤维 防护材料 辐射降温 透湿性
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基于奇数碳软链段PBT基弹力丝的制备及结构性能
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作者 许昌杰 袁如超 +1 位作者 纪峰 李发学 《东华大学学报(自然科学版)》 CAS 北大核心 2024年第4期33-40,共8页
通过分子结构和聚合工艺设计合成了基于奇数碳软链段(聚三亚甲基醚二醇,PO3G)的聚对苯二甲酸丁二醇酯(PBT)基弹性体(PBT-PO3G),并分别以PO3G质量分数为20%和30%的PBT-PO3G为原料,采用熔融纺丝法制备弹力丝。通过与偶数碳软链段(聚四氢... 通过分子结构和聚合工艺设计合成了基于奇数碳软链段(聚三亚甲基醚二醇,PO3G)的聚对苯二甲酸丁二醇酯(PBT)基弹性体(PBT-PO3G),并分别以PO3G质量分数为20%和30%的PBT-PO3G为原料,采用熔融纺丝法制备弹力丝。通过与偶数碳软链段(聚四氢呋喃醚二醇,PTMG)质量分数为30%的PBT基弹性体(PBT-PTMG)及其弹力丝进行对比,探究奇数碳软链段结构对弹性体和弹力丝热力学性能的影响规律。结果显示,PBT-PO3G弹性体和弹力丝的回弹性优于PBT-PTMG,这是因为奇数碳软链段不易结晶。当牵伸倍数为2.5时,PO3G质量分数为30%的PBT-PO3G弹力丝的断裂强度为1.25cN/dtex,在定伸长10%条件下循环拉伸10次,回复率达93%。研究结果可为聚醚酯在弹性纤维领域的应用提供借鉴。 展开更多
关键词 弹力丝 PBT基弹性体 聚三亚甲基醚二醇 熔融纺丝
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茂金属聚丙烯/聚丁烯弹性体复合材料的制备及其控制降解特性研究
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作者 林晓年 雷珺宇 +5 位作者 梁新龙 曾锦润 汪寒辰 张蔚 蔺隆 杨军忠 《广东化工》 CAS 2024年第19期26-31,共6页
茂金属聚丙烯(mPP)具有结晶度高、微晶尺寸小、分子量分布窄以及熔体流动速率易调控等优势,是熔喷无纺布专用料的优质原料。实验结果显示,聚丁烯弹性体(PBt-TPE)加入mPP,可降低mPP的结晶度,减小其微晶尺寸,还能降低其熔体黏度,提高其柔... 茂金属聚丙烯(mPP)具有结晶度高、微晶尺寸小、分子量分布窄以及熔体流动速率易调控等优势,是熔喷无纺布专用料的优质原料。实验结果显示,聚丁烯弹性体(PBt-TPE)加入mPP,可降低mPP的结晶度,减小其微晶尺寸,还能降低其熔体黏度,提高其柔韧性。PBt-TPE也会降低mPP的化学降解反应速率,相应调控mPP/PBt-TPE共混体系的降解过程,可以获得分子量分布更窄的mPP/PBt-TPE复合物。丙烯基弹性体(POE)可以在一定程度上促进mPP/PBt-TPE共混体系的降解反应,获得分子量更低、分子量分布更窄的mPP/PBt-TPE复合体系,进一步改善复合材料的熔喷加工性能。 展开更多
关键词 茂金属聚丙烯 聚丁烯弹性体 丙烯基弹性体 共混 控制降解
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A healable, mechanically robust and ultrastretchable ionic conductive elastomer for durably wearable sensor
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作者 Guoxian Zhang Chunmei Li +4 位作者 JiaoJun Tan Mingqi Wang Yafeng Ren Feijie Ge Qiuyu Zhang 《Nano Research》 SCIE EI CSCD 2024年第4期3369-3378,共10页
The ionic conductive elastomers show great promise in multifunctional wearable electronics,but they currently suffer from liquid leakage/evaporation or mechanical compliance.Developing ionic conductive elastomers inte... The ionic conductive elastomers show great promise in multifunctional wearable electronics,but they currently suffer from liquid leakage/evaporation or mechanical compliance.Developing ionic conductive elastomers integrating non-volatility,mechanical robustness,superior ionic conductivity,and ultra-stretchability remains urgent and challenging.Here,we developed a healable,robust,and conductive elastomer via impregnating free ionic liquids(ILs)into the ILs-multigrafted poly(urethane-urea)(PUU)elastomer networks.A crucial strategy in the molecular design is that imidazolium cations are largely introduced by double-modification of PUU and centipede-like structures are obtained,which can lock the impregnated ILs through strong ionic interactions.In this system,the PUU matrix contributes outstanding mechanical properties,while the hydrogen bonds and ionic interactions endow the elastomer with self-healing ability,conductivity,as well as non-volatility and transparency.The fabricated ionic conductive elastomers show good conductivity(3.8×10^(-6) S·cm^(-1)),high mechanical properties,including tensile stress(4.64 MPa),elongation(1470%),and excellent healing ability(repairing efficiency of 90%after healing at room temperature for 12 h).Significantly,the conductive elastomers have excellent antifatigue properties,and demonstrate a highly reproducible response after 1000 uninterrupted extension-release cycles.This work provides a promising strategy to prepare ionic conductive elastomers with excellent mechanical properties and stable sensing capacity,and further promote the development of mechanically adaptable intelligent sensors. 展开更多
关键词 ionic conductive elastomers poly(urethane-urea)(PUU) ionic interactions centipede-like SELF-HEALING
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聚乳酸/聚烯烃弹性体共混体系的发泡行为
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作者 徐远 邵玮玮 +3 位作者 吴王坚 曾谛 庞永艳 郑文革 《工程塑料应用》 CAS CSCD 北大核心 2024年第7期70-77,共8页
为研究聚乳酸(PLA)共混体系的界面相互作用对发泡材料泡孔结构的影响,选择聚烯烃弹性体(POE)和马来酸酐接枝聚烯烃弹性体(POE-g-MAH)分别与PLA共混,制备PLA/POE和PLA/POE-g-MAH共混物,然后利用釜压发泡,制备共混体系发泡材料。首先,利... 为研究聚乳酸(PLA)共混体系的界面相互作用对发泡材料泡孔结构的影响,选择聚烯烃弹性体(POE)和马来酸酐接枝聚烯烃弹性体(POE-g-MAH)分别与PLA共混,制备PLA/POE和PLA/POE-g-MAH共混物,然后利用釜压发泡,制备共混体系发泡材料。首先,利用扫描电子显微镜(SEM)观察了POE和POE-g-MAH在PLA中的分散情况;然后,利用旋转流变仪研究了PLA/POE和PLA/POE-g-MAH共混体系的流变行为;最后,利用SEM研究了PLA/POE和PLA/POE-g-MAH共混体系发泡材料的泡孔结构,通过测试样品发泡前后的密度计算了膨胀倍率,并探讨了界面相互作用对泡孔结构的影响。结果显示,随着弹性体含量增加,POE和POE-g-MAH的相区尺寸都随之增大,后者的相区尺寸较小;POE和POE-g-MAH含量增加,体系的复数黏度和储能模量也都增大,由于后者与PLA的界面相互作用更强,因此其体系复数黏度和储能模量增大得更显著;当弹性体质量分数为10%和20%时,POE的加入可增强体系的气泡异相成核,因此形成的泡孔尺寸较小,而POE-g-MAH的加入有利于泡孔生长,因此形成的泡孔尺寸较大;在90℃发泡后,PLA/POE-g-MAH10和PLA/POE-g-MAH20发泡材料的膨胀倍率比PLA/POE10和PLA/POE20的更大。 展开更多
关键词 聚乳酸 聚烯烃弹性体 马来酸酐接枝聚烯烃弹性体 共混体系 发泡行为
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GAP/PBAMO基含能热塑性弹性体的可控合成和性能研究
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作者 闫镒腾 白森虎 +2 位作者 孙善虎 吉应旭 刘杉 《化学推进剂与高分子材料》 CAS 2024年第5期30-36,共7页
为了改善传统聚叠氮缩水甘油醚(GAP)基含能热塑性弹性体(ETPE)的性能,以GAP、聚3,3'-双(叠氮甲基)氧杂环丁烷(PBAMO)为预聚物,采用官能团预聚法合成了不同结构组成的GAP/PBAMO基含能热塑性弹性体(GBETPE)。通过傅里叶变换红外光谱(F... 为了改善传统聚叠氮缩水甘油醚(GAP)基含能热塑性弹性体(ETPE)的性能,以GAP、聚3,3'-双(叠氮甲基)氧杂环丁烷(PBAMO)为预聚物,采用官能团预聚法合成了不同结构组成的GAP/PBAMO基含能热塑性弹性体(GBETPE)。通过傅里叶变换红外光谱(FTIR)、核磁共振氢谱(^(1)H-NMR)、凝胶渗透色谱(GPC)以及元素分析等测试手段对共聚物的结构进行表征,证实了共聚物结构与组成的可控性。GBETPE的数均相对分子质量(Mn)为30243~33480,分子量分布(PD)保持在1.22~1.60,氮质量分数为37.47%~39.22%。通过热重(TG)、差示扫描量热仪(DSC)以及拉伸测试对共聚物的热性能和力学性能进行了研究,建立了共聚物结构与性能之间的关系。GBETPE的初始热分解温度(T5%)为219.66~234.88℃,玻璃化转变温度(T_(g))为-37.0~-29.7℃,熔点(T_(m))为60.0~75.5℃,具有较佳的热性能。以HMDI(4,4'-二环己基甲烷二异氰酸酯)和1,4-丁二醇(BDO)作硬段,GAP的质量分数为50.98%,硬段质量分数为25.5%时,GBETPE的最大拉伸强度(σ_(m))为4.70MPa,断裂伸长率(ε_(b))为487.2%,具有较好的力学性能。 展开更多
关键词 聚叠氮缩水甘油醚(GAP) 聚3 3'-双(叠氮甲基)氧杂环丁烷(PBAMO) 含能热塑性弹性体(ETPE) 可控合成 性能
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Composition Dependence of the Thermal Behavior,Morphology and Properties of Biodegradable PBS/PTMO Segment Block Copolymer 被引量:6
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作者 黄勇 LIU Junhong +1 位作者 周涛 张爱民 《Journal of Wuhan University of Technology(Materials Science)》 SCIE EI CAS 2016年第1期219-226,共8页
A series of aliphatic biodegradable poly(ether-ester)s based on poly(butylene succinate)(PBS)as hard segment and poly(tetramethylene oxide)(PTMO,M_n=1 000 g/mol) as soft segment were synthesized.The composit... A series of aliphatic biodegradable poly(ether-ester)s based on poly(butylene succinate)(PBS)as hard segment and poly(tetramethylene oxide)(PTMO,M_n=1 000 g/mol) as soft segment were synthesized.The composition dependence of thermal behavior,morphology and mechanical properties was investigated by differential scanning calorimetry(DSC),atomic force microscopy(AFM),and tensile testing.The crystallization temperature(T_c) and melting temperature(T_m) of the PBS block within poly(ether-ester)s decrease steadily at first,but decrease sharply with PTMO content above 50 wt%.Two crystallization peaks were detected for PTMO in PBSPTMO60 sample,suggesting the occurrence of fractionated crystallization.The crystallization enthalpies(△H_c) and melting enthalpies(△H_m) of PBS block decrease at first,then increase as PTMO content increases further.AFM has demonstrated that phase-separated morphology transforms from a phase of continuous hard matrix to one of continuous soft matrix containing isolated hard domain as PTMO content is increased.Finally,the results of tensile testing show that the poly(ether-ester)s present the behavior of plastics when PTMO content is below 40 wt%,and of thermoplastic elastomers with PTMO content above 50 wt%.By varying the composition of copolymer,the aliphatic poly(ether-ester)s plastics,or especially biodegradable aliphatic poly(ether-ester)s thermoplastic elastomers can be obtained. 展开更多
关键词 poly(ether-ester)s poly(butylene succinate) poly(tetramethylene oxide) thermoplastic elastomers biodegradable polymer
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Determination of Specific Refractive Index Increment (dn/dc)_μ at a Constant Chemical Potential,for Solutions of Polymer in Mixed Solvents by the GPC Method 被引量:1
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作者 WANG Qing-guo LI Xiao-wen CHENG Rong-shi 《Chemical Research in Chinese Universities》 SCIE CAS CSCD 2007年第5期602-606,共5页
A new chromatographic method is described for the determination of specific refractive index increment(dn/dc)μ at a constant chemical potential,for polymer/mixed solvent systems.In this method the(dn/dc)is obtain... A new chromatographic method is described for the determination of specific refractive index increment(dn/dc)μ at a constant chemical potential,for polymer/mixed solvent systems.In this method the(dn/dc)is obtained by measuring the areas of solvated-polymer peaks when the mixed solvent is used as an eluent.Values of(dn/dc)μ for the poly(dimethylsiloxane)(PDMS)-benzene-methanol system,determined by the proposed method are in good agreement with those determined by the conventional dialysis method.The new approach has the advantages of simplicity,fast speed,and high reproducibility.The experimental results for stearic acid-chloroform-methanol system show that this method can also be applied to nonpolymer/mixed solvent systems for the determination of(dn/dc)μ. 展开更多
关键词 Specific refractive index increment GPC poly(dimethylsiloxane Stearic acid
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Electrode Effects on Polyurethane Soft Actuator
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作者 Masato Ohmukai Jun Kyokane 《World Journal of Engineering and Technology》 2017年第3期520-525,共6页
A polymer soft actuator is under investigation using a poly urethane elastomer film that bends by means of an applied voltage, which is based on the electrostriction. Bending experiments were performed under different... A polymer soft actuator is under investigation using a poly urethane elastomer film that bends by means of an applied voltage, which is based on the electrostriction. Bending experiments were performed under different metal electrodes deposited the both sides of the film. Even if the thickness of the both electrodes?is the same, the metal of the both electrodes?is desirable to be the same to bend more. It is suggested that the balance of the physical properties of the both metal is critical for larger bending. 展开更多
关键词 poly URETHANE elastomer Soft ACTUATOR FULLERENOL Metal ELECTRODE
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Response to Applied Voltage to Polyurethane Soft Actuators with Loaded Weights
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作者 Masato Ohmukai Jun Kyokane 《World Journal of Engineering and Technology》 2017年第3期383-388,共6页
We are investigating a polymer soft actuator using a poly urethane elastomer film that bends by an applied voltage, which is based on the electrostriction. In this article, the bending magnitude was studied in a weigh... We are investigating a polymer soft actuator using a poly urethane elastomer film that bends by an applied voltage, which is based on the electrostriction. In this article, the bending magnitude was studied in a weight-loaded condition. It was found that the thinner film can bend the more without any load, but that the film of 200-μm thickness gave the largest bending when weights were loaded. The thickness of some degree is critical for large bending torque. 展开更多
关键词 poly URETHANE elastomer Soft Actuator FULLERENOL DIPOLE MOMENT
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Fabrication and Characterization of Poly(Styrene-Butadiene-Styrene)/Thermoplastic Polyurethane Blends
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作者 Yuhsin Tsai Mu-Chen Kuo Jyh-Horng Wu 《Journal of Materials Science and Chemical Engineering》 2021年第2期1-10,共10页
This investigation presents thermoplastic elastomers (TPEs) based on poly (styrene-butadiene-styrene) (SBS) and thermoplastic polyurethane (TPU) materials were prepared with varying compositions. A series of works wer... This investigation presents thermoplastic elastomers (TPEs) based on poly (styrene-butadiene-styrene) (SBS) and thermoplastic polyurethane (TPU) materials were prepared with varying compositions. A series of works were conducted on the relationships between rheological, optical properties, morphology, mechanical properties, abrasion resistance and thermostability given. The results showed that the shear viscosity of SBS not obvious effect with TPU content. The optical properties of the SBS/TPU blend that its uniform transparency. The morphology characteristics indicating the phase diversion and the variation in the size of the SBS domains from large to small as the TPU contents increased, with heterogeneous domain dispersions. Additionally, the mechanical properties, abrasion resistance and thermal resistance are improved as the amount of added TPU is increased, suggesting that the blending of SBS with TPU is consistent with the compound rule. 展开更多
关键词 Thermoplastic elastomers poly(Styrene-Butadiene-Styrene) Thermoplastic polyurethane
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Synthesis and Characterization of Crystallizable Aliphatic Thermoplastic Poly(ester urethane) Elastomers through a Non-isocyanate Route 被引量:2
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作者 Yue Li Su-qing Li +3 位作者 赵京波 Zhi-yuan Zhang Jun-ying Zhang Wan-tai Yang 《Chinese Journal of Polymer Science》 SCIE CAS CSCD 2016年第10期1220-1233,共14页
A simple non-isocyanate route is developed for synthesizing crystallizable aliphatic thermoplastic poly(ester urethane) elastomers (TPEURs) with good thermal and mechanical properties. Three prepolymers of 1,6-bis... A simple non-isocyanate route is developed for synthesizing crystallizable aliphatic thermoplastic poly(ester urethane) elastomers (TPEURs) with good thermal and mechanical properties. Three prepolymers of 1,6-bis(hydroxyethyloxycarbonylamino) hexane (BHCH), i.e. PrePBHCHs, were prepared through the self-transurethane polycondensation of BHCH. A poly(butylene adipate) prepolymer (PrePBA) with terminal HO-- groups was prepared and used as a polyester glycol. A series of TPEURs were prepared by the co-polycondensation of the PrePBHCHs with PrePBA at 170 ℃under a reduced pressure of 399 Pa. The TPEURs were characterized by gel permeation chromatography, FTIR, 1H-NMR, differential scanning calorimetry, thermogravimetric analysis, wide-angle X-ray diffraction, atomic force microscopy, and tensile test. The TPEURs exhibited Mn up to 23300 g/mol, Mw up to 51100 g/mol, Tg ranging from -33.8 ℃ to -3.1 ℃, Tm from 94.3 ℃ to 111.9 ℃, initial decomposition temperature over 274.7℃, tensile strength up to18.8 MPa with a strain at break of 450.0%, and resilience up to 77.5%. TPU elastomers with good crystallization and mechanical properties were obtained through a non-isocyanate route. 展开更多
关键词 Non-isocyanate route Thermoplastic polyurethane elastomers Diurethanediol Transurethane polycondensation poly(ester urethane)s.
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