NBR,TPU改性软质PVC性能的比较

本文讨论了ＮＢＲ、ＴＰＵ两种不同类型的弹性材料，对软质ＰＶＣ的改性情况，比较了二者对共混物力学性能、弹性性能、老化性能和流变性能的影响，获得了二者共混改性的规律。     

聚甲醛／热塑性聚氨酯弹性共混增韧的研究

本文选用热塑性聚氨酯弹性体（ＴＰＵ）、用Ｂｒａｂｅｎｄｅｒ熔融挤出共混的方法对聚甲醛（ＰＯＭ）的改性增韧性进行了研究。对ＰＯＭ／ＴＰＵ共混体系的力学性能、流变性能、动态力学性能和形态结构进行了测试及分析。结果表明：随着ＴＰＵ用量的增加，共混体系的冲击强度出现峰值，而同时又保持了其它性能的适当水平。     

聚氯乙烯与热塑性聚氨酯的共混改性

将聚氯乙烯（ＰＶＣ）与自制的热塑性聚氨酯（ＴＰＵ）进行共混改性，试验研究了ＰＶＣ分子量、ＰＶＣ／ＴＰＵ共混比及共混方法对共混物性能的影响。结果表明，ＸＳ－３型ＰＶＣ与ＴＰＵ的相容性最好，性能也较为满意。     

HNBR/NBR共混物的动态硫化

以硫黄（１．５份）、促进剂ＤＭ９１．５份）作为ＮＢ交联剂,在１００℃下动态硫化８ｍｉｎ,制得ＨＮＢＲ／ＮＢＲ共混物。考察了不同硫化体系及并用比对动态硫化共混物性能的影响。对比了动态硫化和静态硫化共混物在性能上的差异,并对其加工流动性和微观结构作了探讨。结果表明,随着ＨＮＢＲ含量的增加,动态硫化共混物性能提高,尤其是动态硫化共混物的耐热空气第化性能要优于静态硫化共混物,ＴＥＭ分析表明,ＨＮＢＲ／ＮＮ     

聚甲醛/聚氨酯高韧合金的研究

通过机械共混法制备了ＰＯＭ／ＴＰＵ合金,考查了ＴＰＵ含量、增容剂以及开矿结构对共混物韧性的影响。结果表明,共混方法以及形态结构对共混物的性能有较大影响,增窝剂Ｇ是促进ＴＰＵ分散、使共混物实现高韧化的关键组分。     

TPU／PVC弹性体性能的研究

文章研究了热塑性聚氨酯（ＴＰＵ）对软质聚氯乙烯材料共混改性的情况,探讨了不同类型,不同含量的ＴＰＵ对共混物的力学性能,弹性性能,老化性能及流变性能的影响,从而获得性能较好的共混弹性材料。     

HNBR/EPDM共混物结构与性能研究

分别采用过氧化物和硫给予体作交联剂,考察了不同共混比对氢化丁腈橡胶（ＨＮＢＲ）／ＥＰＤＭ共混物性能的影响,并能力ＤＳＣ和ＴＥＭ分析了共混物的相容性,对两胶的共硫化也作了初步探讨。结果表明,两种硫化体系硫化的共混胶扯断伸长率保持率均在６０％以上,都具有优异的耐热氧老化性能。随ＨＮＢＲ用量增大,共混物的定伸应力、拉伸强度和撕裂强度均提高,磨耗明显降低。ＨＮＢＲ和ＥＰＤＭ为不相容体系,但硫化仪曲线显示二     

TPU/PVC弹性材料性能的研究

研究了热塑性聚氨酯（ＴＰＵ）对软质聚氯乙烯材料共混改性的情况,探讨了不同类型,不同含量的ＴＰＵ对共混物的力学性能、弹性性能、老化性能及流变性能的影响,从而获得了性能较好的共混弹性材料。     

动态硫化了腈橡胶／酚醛树脂共混型热塑性弹性体性能的研究

用动态硫化法制备了丁腈（ＮＢＲ）／酚醛树脂（ＰＦ）共混型热塑性弹性体。研究了ＮＢＲ中丙烯腈含量、ＰＦ品种、橡塑并用比和硫化体系对共混物性能的影响。研究结果表明：随ＮＢＲ中丙烯腈含量的增加，共混物的强度有所提高；随ＰＦ用量的增加，共混物的拉伸强度显著提高，耐油性能和老化性能均得到明显提高：硫磺硫化体系可使ＮＢＲ／ＰＦ并用体系硫化胶有较好的物理机械性能。     

动态硫化丁腈橡胶／酚醛树脂共混型热塑性弹性体性能的研究

用动态硫化法制备了丁腈（ＮＢＲ）／酚醛树脂（ＰＦ）共混型热塑性弹性。研究了ＮＢＲ中丙烯腈含量、ＰＦ品种、橡塑并比和硫化体系对共混通用性能的影响。研究结果表明：随ＮＢＲ中烯腈含量的增加，共混物的强度有所提高：随ＰＦ用量的增加，共混物的拉伸强度显著提高，耐油性能和老化性能均得到明显的提高硫磺硫人体系可使ＮＢＲ／ＰＦ并用 化胶有较好的机理机械性能。     

Scrutinizing the influence of peroxide crosslinking of dynamically vulcanized EVA/TPU blends with special reference to cable sheathing applications

A novel thermoplastic vulcanizate (TPV) based on the blends of ethylene vinyl acetate/thermoplastic polyurethane (EVA/TPU) at various blend ratios has been developed via dynamic vulcanization at 180 °C using di‐(2‐tert‐butyl peroxy isopropyl) benzene (DTBPIB) peroxide as the cross‐linking agent. Modification of the EVA/TPU blends via dynamic crosslinking significantly improves the tensile strength and modulus of the system and the improvement is more significant for EVA/TPU 50/50 and 60/40 blends. AFM study shows that crosslinked EVA particles are dispersed in the continuous TPU matrix and the dispersed EVA domain sizes are relatively smaller in EVA/TPU 50/50 and 60/40 blends leading to good mechanical properties. FTIR spectroscopy has been used to characterize the specific chemical changes occurring due to dynamic vulcanization. This TPV has excellent retention of physico‐mechanical properties even after reprocessing twice and the blends also have very good thermal resistance as indicated by aging study. The samples were found to exhibit remarkable improvement in oil resistance property as compared to their uncrosslinked counterpart. The creep behavior of the blends significantly improves after dynamic crosslinking and blends with higher TPU content show better creep resistance. Volume resistivity of all the peroxide vulcanized blends is in the range of 10¹³ ohm cm, which is suitable for cable sheathing application. © 2016 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2016 , 133, 43706.     

含异氰酸酯基的低聚物和聚醚增容改性POM/TPU共混物

利用双螺杆挤出机制备了聚甲醛(POM)/热塑性聚氨酯弹性体(TPU)、POM/TPU/含异氰酸酯基的低聚物(Z)以及POM/TPU/Z/聚醚3种共混物。采用力学性能测试、差示扫描量热分析(DSC)、偏光显微镜(PLM)、傅里叶转换红外线光谱 (FTIR)、扫描电子显微镜(SEM)、动态力学性能分析(DMA)等,研究了3种共混物的力学性能、结晶行为及形态结构。结果表明：共混物的缺口冲击强度和断裂伸长率随TPU含量的增加而提高;异氰酸酯基低聚物（Z）和聚醚在促进分散相分散、增强两相间的相容性方面发挥重要作用,降低了聚甲醛的结晶度,能够有效地提高共混物的缺口冲击强度和断裂伸长率。     

用于全钢子午线轮胎胎侧胶的反式-1,4-聚异戊二烯/天然橡胶/顺丁橡胶并用胶的性能

研究了不同反式-1,4-聚异戊二烯(TPI)用量对用于全钢子午线轮胎胎侧胶的TPI/天然橡胶(NR)/顺丁橡胶(BR)并用胶力学性能、动态力学性能和热老化性能的影响,并对并用胶进行了配方优化。结果表明,当TPI/NR/BR的并用比(质量比)为15.0/42.5/42.5时,混炼胶外表光滑,硬度适中;TPI/NR/BR并用胶的硫化特性与NR/BR并用胶相比变化不大,且在保持后者力学性能的基础上,动态力学性能明显提高;经配方优化后,并用胶耐屈挠性优异,滚动阻力、压缩生热降低,是一种较为理想的全钢子午线轮胎胎侧胶材料。     

The influence of filler treatment on the properties of TPU/PP blends: I. Thermal properties and stability

Commercially available organosilane (3‐glycidoxypropyltrimethoxysilane (GPTMS)) coupling agent was used to treat talc in order to improve the affinity relative between the filler and the polymer in composites as well as filler and polymer in the thermoplastic polyurethane/polypropylene (TPU/PP) blends (talc content was 5 wt%). The talc particles were first modified with GPTMS and then introduced into TPU, PP as well as TPU/PP blends with different weight ratios of polymers using blending method and subsequently injection molded in a hydraulic press. The aim was to report the effect of silane coupling agent on the thermal and morphological properties of talc filled composites and blends. The results showed that the thermal properties of the TPU, PP composites and TPU/PP blends were improved with the addition of silane treated talc (higher melting (T_m), crystallization (T_c) temperatures and degree of crystallinity (χ_c)). The glass transition temperature (T_g) obtained by dynamic mechanical analysis (DMA) of the TPU soft segments in TPU/PP blends increased with the addition of untreated and silane treated talc due to lower mobility of the soft segments in TPU and better miscibility of TPU and PP. TPU/PP blends with the silane treated talc show better thermal stability than the TPU/PP blends with untreated talc. POLYM. ENG. SCI., 55:1920–1930, 2015. © 2014 Society of Plastics Engineers     

Rheology and properties of EPDM/BR blends with or without a homogenizing agent or a coupling agent

Rheology, dynamic mechanical properties, mechanical properties, and morphology of ethylene–propylene–diene rubber/butadiene rubber (EPDM/BR) blends with or without a homogenizing agent or a coupling agent were investigated. AAHR (a mixture of aliphatic and aromatic hydrocarbon resins) was used as a coupling agent. The dynamic mechanical analysis and the morphological studies revealed that EPDM and BR were incompatible and the addition of AAHR was very effective to plasticize the EPDM/BR blend and enhance the compatibility between EPDM and BR. It was found that the addition of an AAHR increased the amounts of bound rubbers and, hence, the vulcanizate properties such as tear strength and fatigue resistance of the EPDM/BR blends were improved. The blends of maleic anhydride-grafted EPDM and BR were also prepared and the properties were compared. The dynamic mechanical analysis and the morphological studies revealed that the addition of TESPT increased the weight of bound rubbers and provided better dispersion of carbon black, resulting in good mechanical properties such as tear strength and fatigue resistance of the vulcanized EPDM/BR blends. © 1996 John Wiley & Sons, Inc.     

Thermoplastic polyurethane/polypropylene blends based on novel vane extruder: A study of morphology and mechanical properties

Thermoplastic polyurethane (TPU) polypropylene (PP) blends of different weight ratios were prepared with a self‐made vane extruder (VE), which generates global dynamic elongational flow, and a traditional twin‐screw extruder (TSE), which generates shear flow. The mechanical properties, phase morphology, thermal behavior, and spherulite size of the blends were investigated to compare the different processing techniques. Samples prepared with a VE had superior mechanical properties than the samples prepared with a TSE. Scanning emission micrographs show that the fiber morphology of the TPU/PP blends (<60 wt% TPU) was improved by elongational flow in VE. Differential scanning calorimetry curves indicate that a dynamical elongational flow could improve the miscibility of the TPU/PP blends. The U‐shaped spherulite size curve indicates the changes in the spherulite size, as observed from a polarization microscope. Interlocked spherulites also reveal the apparent partial miscibility of the TPU/PP blends under elongational flow. POLYM. ENG. SCI., 54:716–724, 2014. © 2013 Society of Plastics Engineers     

Influence of Graphene Oxide on Thermally Induced Shape Memory Behavior of PLA/TPU Blends: Correlation with Morphology,Creep Behavior,Crystallinity, and Dynamic Mechanical Properties

In this study, shape memory is thermally induced in a series of graphene oxide (GO) filled poly(lactic acid)/thermoplastic polyurethane (PLA/TPU) blends, prepared via melt mixing process, and their shape recovery and shape fixity are measured, and the results are correlated with morphology, dynamic mechanical properties, crystallinity and creep recovery behavior. Morphological analysis by scanning and transmission electron microscopy reveals that the blends are immiscible, and GO platelets are mainly localized in the TPU phase of the blends, which lead to smaller and more elongated TPU droplets with improved interfacial adhesion being responsible for the improved shape recovery performance compared to the unfilled blend. A systematic enhancement found in storage and Young's modulus, tensile strength, creep resistance and creep recovery, and cold crystallinity as a result of GO inclusion are in agreement with the improved shape recovery, shape fixity and overall shape memory performance of the filled systems. The developed PLA/TPU/GO nanocomposites with highly improved mechanical properties can be utilized as a new class of environmentally friendly shape memory materials for a broad range of applications.     

Thermoplastic elastomers-based natural rubber and thermoplastic polyurethane blends

Thermoplastic elastomers based on the blends of thermoplastic polyurethane (TPU) and natural rubber were prepared by a simple blend technique. The influence of the two different types of natural rubber (i.e., unmodified natural rubber (NR) and epoxidized natural rubber (ENR)) on properties of the blends was investigated. The main aim of this study was to improve heat resistance and damping properties, and also to prepare the TPU material with low hardness by blending with various amounts of natural rubber. It was found that the TPU/ENR blends exhibited superior modulus, hardness, shear viscosity, stress relaxation behavior and heat-resistant properties compared to the blends with TPU and unmodified NR. This was attributed to higher chemical interaction between the polar functional groups of ENR and TPU by improving the interfacial adhesion. It was also found that the ENR/TPU blends exhibited finer grain morphology than the blends with unmodified NR. Furthermore, lower tension set, damping factor (Tan ??) and hardness, but higher degradation temperature, were observed in natural rubber/TPU blends compared to pure TPU. This proves the formation of TPU material with high heat resistance, low hardness and better damping properties. However, the blends with higher proportion of natural rubber exhibited lower tensile strength and elongation at break.     

偶联剂Si 69对NR/BR/NBR共混硫化胶性能的影响

研究了偶联剂Si 69对NR／BR／NBR共混胶体系的硫化特性、交联密度和硫化胶的物理机械性能及动态力学性能的影响。结果表明，偶联剂Si 69在共混硫化胶中可以起到提高聚合物与填料间的相互作用和交联密度的作用，它在白炭黑增强硫化胶中对性能的改善比在炭黑增强硫化胶中的改善更显著。     

TPU增韧改性POM的研究

利用双螺杆挤出机制备了聚甲醛(POM)/热塑性聚氨酯弹性体(TPU)和POM/TPU/异氰酸酯预聚物(Z)共混物.采用力学性能测试方法、偏光显微镜(PLM)、傅立叶转换红外线光谱 (FTIR)、扫描电子显微镜(SEM)等研究了共混物的力学性能、结晶行为及形态结构.结果表明,不同种类TPU增韧的共混物的缺口冲击强度和断裂伸长率都随TPU含量的增加而增加,TPU(95A)增韧的POM/TPU共混物的刚性较好,TPU(250)增韧的POM/TPU共混物的韧性较好;Z能促进TPU在基体树脂中的均匀分散,增强两相界面的粘结力,并能细化球晶.