TPU／CPE及TPU／CPE／PVC的性能研究

采用机械共混的方法，将CPE、PVC与TPU熔融共混。研究了TPU／CPE及TPU／CPE／PVC共混体系。对其力学性能、流变性能及耐油性能进行了测试及分析。结果表明：CPE及CPE／PVC的加入可改善TPU的加工性能并降低其成本。     

IFR对TPU/CPE体系的阻燃作用

采用国产热塑性聚氨酯弹性体（TPU）、氯化聚乙烯（CPE）在TPU／CPE二元共混改性体系的基础上，添加自行复配研制的膨胀型阻燃剂（IFR），对所构成的TPU／CPE／IFR进行了研究。结果表明：TPU／CPE／IFR阻燃体系阻燃性可达到FV—0级（IFR为19.2份），并具有较好的力学性能；该阻燃体系的拉伸强度、断裂伸长率分别保持了TPU／CPE的56％和73％。TPV／CPE／IFR体系随着IFR用量的增加，流动性变好。     

TPU/CPE共混物性能研究

研究热塑性聚氨酯(TPU)/氯化聚乙烯(CPE)共混比和补强剂品种及用量对TPU/CPE共混物性能的影响.结果表明,当TPU/CPE共混比为70/30和60/40时,TPU与CPE的相容性较好,共混物综合性能优异;补强剂可改善TPU/CPE共混物的加工性能,随着补强剂用量的增大,共混物邵尔A型硬度、拉伸强度和撕裂强度增大,拉断伸长率减小;改性白炭黑对共混物的补强效果优于炭黑N330和N550,其适宜用量为30份左右.     

PU文摘

TL-650无钾聚醚多元醇的开发；TMXDI在水性聚氨酯中的应用；TPU／CPE及TPU／CPE／PVC的性能研究；TPU与改性聚丙烯的共混研究及分析；TPU增韧改性PBT的研究；TPU生产工艺路线的比较与选择；[编者按]     

热塑性聚氨酯/氯化聚乙烯共混物形态与性能的影响因素

采用机械共混法制备了热塑性聚氯酯(TPU)/氯化聚乙烯(CPE)共混物,考察了共混比(质量比,下同)对共混物加工性能、力学性能及微观形态的影响.研究了热稳定剂种类对共混物力学性能、热稳定性的影响.结果表明.加入CPE可以明显改善TPU的加工性能;在TPU与CPE的共混比分别为70/30和60/40时,TPU/CPE共混物具有较好的力学性能;TPU与CPE共混,二者的相容性较好,热稳定性均得到提高;自制环保型钙锌复合稳定剂的综合稳定作用较好,且所得共混物的力学性能也好.     

微胶囊红磷在TPU阻燃系统中的应用

采用国产TPU、CPE,在TPU/CPE二元共混改性体系中添加阻燃合金HT 951,对所构成的TPU阻燃体系进行研究。实验表明:TPU/CPE/HT 951阻燃体系可达到FV 0级(HT 951=10phr),具有很好的阻燃性能;同时拉伸强度保持了纯TPU的71%,断裂伸长率保持了纯TPU断裂伸长率的87%,具有较好的力学性能;加工性能也随着阻燃剂份数的增加有一定的改善。     

TPU/CPE体系中膨胀型阻燃剂的应用研究

采用国产TPU、CPE,在TPU/CPE二元共混改性体系的基础上,添加膨胀型阻燃剂HT931,对所构成的TPU阻燃体系进行了研究。结果表明:TPU/CPE/HT931阻燃体系有较好的阻燃性能,可达到FV0级(HT931=15份),并有较好的力学性能,与纯TPU相比,该体系的拉伸强度保持了纯TPU拉伸强度的67%,断裂伸长率保持了纯TPU断裂伸长率的80%,流动性变好。     

共混条件对HPVC／PP共混物力学性能,形态和流变性能的影响

本文考察了加料方式、共混温度和时间等共混条件对HPVC/PP共混物力学性能、形态和流变性能的影响.对HPVC50/PP50/CPE10共混物采用7种加料方式,对HPVC50/PP50/ABS10共混物采用2种加料方式来分别考察加料方式的影响;采用B加料方式,分别在160、170和180℃共混,考察温度的影响;在B加料方式170℃时分别共混2、5、10、15min,考察共混时间的影响.结果表明,采用CPE预先与HPVC共混后再与PP共混的加料方式,所得共混物具有最佳的综合力学性能,共混物组分分散最细微;共混温度以170℃为宜;共混时间以5min恰当.加料方式也影响共混物的熔体粘度,CPE或ABS先与HPVC共混后再与PP共混的共混物,其η_α高于CPE或ABS先与PP共混后再与HPVC共混的共混物η_α.     

CR/HPVC热塑性弹性体的性能研究

选用氯丁橡胶（CR）和高聚合度聚氯乙烯（HPVC）为主体材料，用动态硫化法制备了一类性能优异的材料－CR／HPVC共混型热塑性弹性体（TPE）。研究了共混方法、硫化温度、硫化体系、硫化剂用量及硫化时间等因素对动态硫化CR／HPVC热塑性弹性体力学性能的影响。     

动态硫化NBR/HPVC热塑性弹性体的性能研究

研究了动态硫化NBR／高聚合度聚氯乙烯（HPVC）热塑性弹性体的硫化特性、物理性能及加工性能。试验结果表明，PVC聚合度越大，NBR／HPVC共混比越大，动态硫化NBR／HPVC的加工性能越差；当橡塑共混比为70／30，动态硫化温度在150－155℃时，采用硫化剂TMTD硫化体系制备的动态硫化NBR／HPVC的综合物理性能优良，热塑性较好，可重复加工。     

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。     

高聚合度PVC/POE热塑性弹性体的性能研究

使用EVACO、CPE、NBR增容高聚合度聚氯乙烯(HPVC)/POE弹性体,研究了增容共混体系的力学性能、耐油耐溶剂性、热空气老化性能以及加工流变性能。结果表明:增容共混改性后,体系中的增塑剂耐异辛烷抽出能力提高,在油酸中的质量损失率减小,同时也有效改善了其加工流动性;通过红外光谱分析可知,改性后的HPVC弹性体中增塑剂在热空气中挥发损失率减小,抗老化性能得到改善。其中,HPVC与POE质量比在100:10到100:15范围内,体系综合性能较佳。     

改善HPVC／PP共混物的相容性

分别采用ＣＰＥ、ＡＢＳ、ＰＰｇＭＡ、ＰＰｇＰＡＡ和低分子量反应性化合物作相容剂来改善ＨＰＶＣ／ＰＰ共混物的相容性。结果表明：用它们作相容剂可以提高ＨＰＶＣ／ＰＰ共混物的力学性能，改变其形态结构，减小分散相尺寸，改善相容性。其中ＣＰＥ是最佳相容剂。     

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。     

Mechanical,morphological, and thermal properties of (thermoplastic polyurethane)/(chlorinated polyethylene) blends

The preparation and characterization of CPE (chlorinated polyethylene)/TPU (thermoplastic polyurethane) blends with various ratios were investigated. The compatibility, morphology, and rheology, as well as the thermal and physico‐mechanical properties, were studied by differential scanning calorimetry, Fourier‐transform infrared spectroscopy, scanning electron microscopy, thermogravimetric analysis, universal tensile machine analysis, and capillary rheometry. The results showed that CPE is partially miscible with TPU. The introduction of CPE into TPU resulted in a reduction of the viscosity, tensile strength, tear strength, compression set, abrasion resistance, and hardness, whereas the elongation at break was increased. Thermogravimetric analysis showed that the blends underwent two stages of thermal degradation. J. VINYL ADDIT. TECHNOL., 19:192‐197, 2013. © 2013 Society of Plastics Engineers     

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.     

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。     

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.     

HPVC/SBR共混体系相容性的研究

采用动态硫化方法制备高聚合度聚氯乙烯（ＨＰＶＣ）／ＳＢＲ共混型热塑性弹性体,考察了单一组分相容剂「相容剂分别为ＮＢＲ２７０、ＮＢＲ Ｐ６５、ＣＰＥ和氢化苯乙烯－丁二烯、苯乙烯嵌段共聚物（ＳＥＢＳ）」、复合相容剂（ＳＥＢＳ／ＮＢＲ和ＣＰＥ／ＮＢＲ）及交联程度对ＨＰＶＣ／ＳＢＲ共混体系相容性的影响。结果表明,使用复合相容剂可明显改善ＨＰＶＣ／ＳＢＲ共混物的性能;动态硫化在改善共混物力学性能方面起主要作