热塑性聚氨酯与聚氯乙烯共混研究进展

综述了热塑性聚氨酯与聚氯乙烯共混改性研究进展，重点介绍了热塑性聚氨酯与聚氯乙烯共混物的相容性、共混方式、热塑性聚氨酯的类型和组分、助剂和第三组分聚合物等对共混物性能的影响及其应用。     

热塑性聚氨酯与弹性体的共混及应用

本文简要论述了热塑性聚氨酯和苯乙烯嵌段共聚物的结构与性能。在分析聚合物共混的基本条件如混溶性与相容性的基础上,介绍了热塑性聚氨酯与热塑性弹性体(如苯乙烯嵌段共聚物)的共混方法及设备,并对其共混效果与应用作了简单的介绍。     

热塑性聚氨酯与聚烯烃共混改性研究进展

综述了热塑性聚氨酯(TPU)与其他聚合物共混改性以提高其相容性的方法,TPU与聚烯烃共混改性的应用及研究进展。共混改性后的复合材科在某些性能上得到提高或改善,共混为开发新材料提供了途径,扩大了热塑性聚氨酯的应用范围。     

耐磨型可扁平聚氨酯软管的研制

利用共混改性和增韧方法,选择聚醚型热塑性聚氨酯为内胶层胶料,增强纤维层的强度,利用热塑性聚氨酯和EPDM共混,改进内外胶层的生产工艺,使可扁平聚氨酯软管的耐磨性得到提高。     

热塑性聚氨酯/聚氯乙烯/橡胶共混物的结构和性能

目前由于在北方条件下广泛使用聚合物,急需解决具有高强度、高耐寒性和可焊性的新型共混聚合物材料的加工。热塑性聚氨酯与聚氯乙烯的共混物是用于制造这种材料的最有效原料。但是,欠佳的耐寒性限制了它们的使用。为了提高它们的耐寒性,人们对利用具有酯基的橡胶来改性聚氯乙烯与热塑性聚氨酯共混物的性能研究引起了兴趣。以牌号ЮМЭ的热塑性聚氨酯、牌号为C—7058M含稳定剂的聚氯乙烯、酯基橡胶     

ABS树脂的共混改性

简要介绍了采用聚氯乙烯、聚碳酸酯、热塑性聚氨酯单体等不同热塑性塑料对丙烯腈－丁二烯－苯乙烯三元共聚物（ＡＢＳ）树脂进行共混改性,从而提高ＡＢＳ树脂的性能,并且对共混改性的机理进行了探讨,指明了不同组分对ＡＢＳ树脂性能的影响。     

粹文详摘

CW147 超高分子量聚乙烯和聚氨酯共混物的相容性 超高分子量聚乙烯(UHMWPE)是一种有优异机械性能的耐磨热塑性塑料,聚氨酯(PU)是有良好韧性的热塑性弹性体,若把二者共混在一起成为塑料-橡胶型的共混物,用作耐磨材料则有     

热塑性聚氨酯弹性体的发展

简单介绍了热塑性聚氨酯弹性体的合成、性能及其在共混、补强、互穿网络等方面的最新发展。     

聚氨酯材料的再生利用

介绍了聚氨酯材料的再生利用 ,研究了NBR类、SBS类和EPDM类 3种热塑性弹性体及NBR类热塑性弹性体和氧化铝填料的用量对改性废聚氨酯材料物理性能的影响。结果表明 ,热塑性弹性体在一定用量内能明显提高改性废聚氨酯材料的物理性能 ,其中EPDM类热塑性弹性体对共混材料的综合改性效果最好 ,NBR类最差。     

热塑性聚氨酯共混物的增容方法

综述了作为聚氨酯弹性体的一种,热塑性聚氨酯（TPU）与其他聚合物共混改性时,可提高增容性的6种方法（如调整分子链结构、改变共混聚合物的极性、化学改生引入反应性官能团、改变分子极性、加入相容剂、形成互穿网络等）,并提到了对相容性影响很大的共混方法和工艺条件.     

聚氨酯／顺丁橡胶共混物结构与性能的研究

采用物理共混的方法,制备了廉价的ＢＲ和贵的热塑性聚氨酯（ＴＰＵ）共混物。利用电子拉力机,液变仪,动态粘弹仪,偏光显微镜和电子显微镜对力学性能、流变性能,动态粘弹性和形态结构进行了研究和分析。结果表明,ＢＲ和ＴＰＵ有较好的相容性,ＴＰＵ／ＢＲ共混物能达到使用要求,一些性能好于纯ＴＰＵ《     

Compatibilization of thermosetting-thermoplastic polymer blends

Polymer blends of thermosetting and thermoplastic polymers were developed by properly mixing them in the presence of compatibilizers. Two compatibilizers that are structurally and chemically similar to thermosetting and thermoplastic polymers and a compatibilizer that does not have such similarity were synthesized. Polymer blends of phenol formaldehydepoly(methyl methacrylate) and phenol formaldehyde-polystyrene were prepared by using the compatibilizers, poly(phenol formal dehyde-s-triazine-methyl methacrylate), P(PF-g-MMA), poly(phenol formaldehyde-s-triazine-styrene), P(PF-g-S), and poly (cinnamaldehyde-co-oxy propylene oxy isophthaloyl-cooxy propylene oxy fumaroyl), P(C-g-E). The effects of molecular weight and quantity of the copolymer on the compatibility of the polymer were examined. The optimum compatibility which leads to superior tensile properties of the present blends was observed with P(PF-g-MMA) and P(PF-g-S) copolymers. The superior properties were also found to occur only in the range of the optimum molecular weight and quantity of the copolymer present in the blend. The polymer blends were analyzed by differential scanning calorimetry (DSC) and Electron Microscopy. DSC scans of P(PF-g-MMA) and P(PF-g-S) copolymer blends showed a single T_g whereas the scans of P(Cg-E) copolymer blends showed an additional T_g for unblended thermoplastic fractions. The electron microscopy studies also revealed good compatibility in P(PF-g-MMA) and P(PF-g-S) copolymer blends in which the unblended thermoplastic fractions are negligibly less. The UV-vacuum and heat resistance of the P(PF-g-MMA) and P(PF-g-S) copolymer blends were found to be good.     

Electron beam cross-linking of EVA/TPU blends

Abstract

Ethylene vinyl acetate (EVA) copolymer and thermoplastic polyurethane (TPU) with different blending ratios were melt mixed in an internal mixer. The blends were then exposed to electron beam (EB) irradiation with different doses of 50, 100, 150, 200 and 250 kGy. FTIR spectroscopy and dynamic mechanical thermal analysis (DMTA) were used to investigate the effect of cross-linking and blending ratio on chemical structure as well as solid state viscoelastic properties of the blends. FTIR spectroscopy showed interchain cross-linking during melt blending and also radiation cross-linking during solid state irradiation. Observation of one damping peak for blends at almost all blending ratios was an indication of miscibility of these blends. The results indicated formation of interchain cross-linking stabilised with exposure to EB irradiation. Mechanical properties of the blends were investigated via stress–strain curves. Modulus showed a monotonic increasing trend with the radiation dose, but tensile strength and elongation at break were initially increased and then decreased with increasing radiation dose. This was attributed to two competing parallel factors of strain induced crystallisation and degree of cross-linking.     

热塑性聚氨酯弹性体／氯化聚乙烯共混体系的研究

选用ＣＰＥ和ＣＰＥ／ＰＶＣ为改性剂．用双辊熔融共混的方式对ＴＰＵ的共混改性进行了系统的研究，对ＴＰＵ／ＣＰＥ和ＴＰＵ／ＣＰＥ／ＰＶＣ共混体系的性能进行了测试分析及对比。结果表明：选择适宜的ＴＰＵ种类和ＣＰＥ、ＣＰＥ／ＰＶＣ分别组成二元和三元共混体系，能明显改善ＴＰＵ的加工特性，并且基本保待了ＴＰＵ优良的耐油性和耐寒性。     

Thermoplastic urethane elastomers V. Compatible and incompatible blends with various polymers

Various blends over extended compositional ranges have beer, prepared for combinations of a thermoplastic urethane elastomer with polystyrene, a styrene-acrylonitrile copolymer, a polyhydroxyether (Phenoxy A), and poly(vinyl ethyl ether). The thermoplastic urethane elastomer was based on a polycaprolactone diol of approximately 2100 number average molecular weight, 4,4′-diphenylmethane diisocyanate and 1,4-butanediol at a molar ratio of 1/2/1, respectively. At ambient temperature, the tensile properties of the blends typically are intermediate between the values of the two separate components. Characterizations of the dynamic mechanical properties of the blends show the relative degree of compatibility for the thermoplastic urethane elastomer and the respective polymers. Two separate glass transitions are obtained for blends of polystyrene and the styrene-acrylonitrile copolymer with the thermoplastic urethane elastomer. This behavior demonstrates that these blend systems are incompatible. The blends of Phenoxy A and the thermoplastic urethane elastomer exhibit a single glass transition for which the temperature is dependent on the respective concentration of the components. These mixtures are considered to be compatible in nature.     

高聚合度PVC／TPU共混物的制备与研究

本文研究了采用高聚合度聚氯乙烯(PVC)和热塑性聚氨酯(TPU)为主体材料制备高聚合度PVC/TPU共混物的过程,讨论了高聚合度PVC/TPU并用比、填料、增塑剂、共混工艺等因素对高聚合度PVC/TPU共混物性能的影响。     

Co-extruded multilayer shape memory materials: Comparing layered and blend architectures

Shape memory polymers (SMPs) are a class of materials that exhibit the ability to form multiple temporary shapes, with shape change most often occurring upon exposure to heat. Applications of SMPs can be found in many areas such as sensors, packaging, smart fabrics, and most commonly medicine. Often, thermoplastic SMPs are based on block copolymer or blend morphologies that create two distinct phases, which are on the nano- or micro-scale respectively, to facilitate shape fixing and shape recovery. Forced assembly multilayer co-extrusion of commercially available polyurethane (PU) and polycaprolactone (PCL) polymers was used to create a continuous periodic alternating layer architecture that exhibits shape memory behavior. Similar shape memory properties were observed between PU/PCL layers and blends at 50/50 volume composition; however, offset compositions showed significantly different behavior. The layered structure was maintained across all compositions, as compared with blends that exhibit a composition dependent morphology. The difference in morphology was directly attributed to the difference in shape memory behavior observed between layered and blend films with domain sizes on the micro-scale.     

热塑性聚氨酯弹性体与乙华平橡胶共混物的性能

将聚酯型和聚醚型聚氨酯弹性体(TPU385E,TPU8685)分别与不同乙酸乙烯酯含量的乙华平橡胶(EVM400,EVM700)进行共混,考察了原料种类、共混比对共混物力学性能和耐磨性的影响。结果表明,随着TPU用量的增加,EVM/TPU共混物的拉伸强度、邵尔A硬度、100%定伸应力和300%定伸应力均提高,扯断伸长率下降;随着EVM用量的增加,EVM/TPU共混物的拉伸强度、邵尔A硬度、100%定伸应力和300%定伸应力均降低,扯断伸长率增大;随着TPU用量的增加,EVM/TPU共混物的耐磨性提高;TPU8685/EVM400共混物具有最大的拉伸强度,TPU385E/EVM700共混物具有最大的扯断伸长率,TPU8685/EVM700共混物具有最好的耐磨性;当2种TPU与EVM400质量比都为50/50时,TPU385E/EVM400的耐磨性最差。