PVC／TPU／SBS—g—MMA共混体系研究

制备了ＳＢＳ－ｇ－ＭＭＡ系列接枝共聚物,并对其进行了表征。以ＳＢＳ－ｇ－ＭＭＡ作为ＰＶＣ／ＴＰＵ共混体系的增容剂,对不同配比的ＰＶＣ／ＴＰＵ／ＳＢＳ－ｇ－ＭＭＡ共混体系的物理力学性能、流变性等进行了研究。结果表明,ＳＢＳ－ｇ－ＭＭＡ接枝共聚物对ＰＶＣ／ＴＰＵ共混体系起到了明显的增容作用。     

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。     

Influence of the synthesis conditions on the properties of thermoplastic polyurethane elastomers

Thermoplastic polyurethane elastomers (TPUs) of constant composition were prepared by using the prepolymer method and by changing the reaction conditions (prepolymerization and chain‐extension time) to study the influence of these conditions on the final TPU properties. The TPUs were characterized by gel permeation chromatography, differential scanning calorimetry, strain–stress measurements, and contact‐angle measurements. To test the adhesion properties of the TPUs, poly(vinyl chloride) strips were bonded to each other by using TPU solutions and the T‐peel strength of the adhesive joints was measured. It was found that provided a threshold is crossed, the prepolymerization time markedly influences the final properties of the TPUs (viscosity of solutions, molecular weight, mechanical and adhesive behavior), whereas the chain extension time does not. Therefore, it is possible to prepare TPUs with specific properties by playing with the prepolymerization conditions. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 76: 1590–1595, 2000     

车用尼龙轮毂饰盖金属涂料的研制

以聚酯改性弹性聚氨酯树脂作为主要成膜物质,加入甲基异丁酮、环己酮、甲苯等助剂、溶剂以及铝粉、蜡等制备车用尼龙轮毂饰盖涂料。讨论树脂的选择、铝粉添加量、溶剂种类等对涂膜性能的影响。结果表明:该涂料附着力、耐蒸汽喷射、耐热性、耐冷凝水、热存放、冷存放、耐候性等都满足大众汽车标准。     

HGB/TPU复合泡沫材料的制备及泡孔结构研究

采用空心玻璃微珠（HGB）填充热塑性聚氨酯（TPU）,制备了HGB/TPU复合泡沫材料。研究了硅烷偶联剂KH550对HGB的表面处理,并借助SEM探讨了不同发泡方式、发泡剂含量、HGB含量对复合泡沫材料微观形态结构的影响。结果表明：经KH550处理的HGB与TPU基体界面结合良好;通过注塑发泡得到的泡沫材料发泡效果较好;当发泡剂含量为1%、HGB含量为2%时复合泡沫材料的泡孔分布均匀,尺寸较为均一。     

PPDI型热塑性聚氨酯弹性体的制备与性能研究

以对苯二异氰酸酯(PPDI)、低聚物二元醇和1,4-丁二醇为原料合成PPDI型热塑性聚氨酯弹性体(TPU),考察了软段种类和相对分子质量、硬段含量、R值(n(NCO)∶n(OH))等对其性能的影响,并与MDI型TPU的动态力学性能作比较.结果表明,聚ε-己内酯(PCL)体系TPU具有良好的性能,硬段含量和R值的提高均可...     

Dynamic mechanical properties of nanoclay filled TPU/PP blends with compatibiliser

Abstract

Blends of thermoplastic polyurethane (TPU) and polypropylene (PP) are highly incompatible because of large differences in polarities and high interfacial tensions. On one hand, PP is added to TPU to improve TPU's thermal stability, chemical properties, mechanical properties (modulus, strength and hardness) and processing performance and to reduce TPU's cost. On the other hand, TPU is blended with PP to improve PP's properties (e.g. abrasion, flexibility, tear strength, shock absorbing capabilities, impact strength, adhesion and paintability/printability). Earlier works in polyurethane/organoclay nanocomposites, PP/organoclay nanocomposites and TPU/PP blends were studied. In our experimental work, both ester and ether based TPU nanocomposites were prepared by melt blending using 3?wt-% Cloisite 10A (organically modified montmorillonite clay) as the nanoscale reinforcement and blended with PP with/without PP-graft-maleic anhydride as the compatibiliser. Blends of nanoclay filled TPU/PP were evaluated for dynamic mechanical properties such as storage modulus E′, loss modulus E″ and dissipation factor tanδ.     

影响热塑性聚氨酯弹性体性能的因素浅析

对影响热塑性聚氨酯弹性体性能的因素进行了分析和讨论,包括多元醇的结构和相对分子质量、异氰酸酯和扩链剂种类、扩链系数、硬段含量、氢键、催化剂等。提出在生产热塑性聚氨酯弹性体过程中要对体系配方进行科学设计。     

PVA/TPU共混材料热塑加工性能及相容性的研究

采用热塑加工方法制备了聚乙烯醇/热塑性聚氨酯(PVA/TPU)共混材料,系统研究了共混材料的热塑加工性能、相容性及力学性能。结果表明:TPU的引入对共混材料的熔点影响不大,但其与PVA间的氢键作用可屏蔽PVA的羟基,较大幅度地提高了PVA初始热分解温度,获得更宽的热塑加工窗口;引入适量的TPU还可降低共混材料的熔体黏度,改善材料的热塑加工性能,另外,还可获得良好的材料相容性;随着TPU用量的增加,共混材料的拉伸强度先增后降,并在TPU用量为50 phr时达到最大值。     

动态硫化对共混物TPU/EVM动态力学性能的影响

橡胶加工分析仪RPA2000测试发现,动态硫化后共混物的储能模量G′升高,应变和温度依赖性减弱,Payne效应减弱,损耗因子tanδ降低,但频率依赖性与动态硫化前相似;RPA2000温度扫描中发现,在温度低于80℃时,动态硫化后G′反而降低,动态粘弹谱仪(DMA)测试也显示,动态硫化后共混物在高弹态时储能模量比硫化前低,原因可能是交联网络破坏了在高弹态时对模量贡献很大的热塑性聚氨酯(TPU)与白炭黑之间形成的键合橡胶。