原位成纤增强热塑性弹性体的相形态控制及结构性能研究

In-situ Microfibrillar as an important method to improve mechanical properties of thermoplastic polymer is attracted more and more attention. Thermoplastic elastomer (POE, SEBS) was used as matrix , thermoplastic plastics (PP, PET, PA6) as the dispersed phase in this project, prepared In-situ microfibrillar reinforced thermoplastic elastomer composites materials in microlayered coextrusion equipment. Effect of shear rate, time, drawing speed , contents of dispersed phase, size of dispersed phase, viscosity ratio and interfacial tension on the dispersed phase morphological evolution and fiber morphology in the forming process of In-situ Microfibrillar are researched. The mechanism of In-situ Microfibrillar forming in micolayered coextrusion equipment is clarified. A new method of In-situ Microfibrillar reinforced thermoplastic elastomer is obtained. Effect of fiber phase morphology on the dynamic rheological behavior of composite materials is researched. Effect of secondary processing on the fiber morphology and the properties of composite materials is researched.The relation model between fiber morphology,interfacial compatibility and material properties is established. A new method to prepare high performance thermoplastic elastomer is provided in this project.

原位成纤作为一种提高热塑性聚合物力学性能的重要方法受到广泛关注，本项目以热塑性弹性体(POE, SEBS)为基体，热塑性塑料(PP, PET, PA6)为分散相，在微纳层叠共挤装置中实现分散相的原位成纤，制备原位成纤增强热塑性弹性体复合材料。研究剪切速率、时间、牵引速度及分散相含量、分散相尺寸、粘度比、界面张力对分散相原位成纤过程的形态演变及纤维形态的影响，阐明聚合物微纳层叠共挤装置中分散相的原位成纤机理，获得一种原位成纤增强热塑性弹性体的新方法。研究纤维相对复合材料动态流变行为及二次加工对纤维形态及复合材料性能的影响，建立纤维形态、界面相容性与原位成纤增强热塑性弹性体复合材料性能之间的对应关系。通过本项目的研究，为制备高性能热塑性弹性体提供一种新方法。

原位成纤作为一种提高热塑性弹性体性能的重要方法受到广泛关注。本项目以热塑性弹性体为基体，热塑性塑料为分散相，通过微纳层叠共挤装置实现了聚对苯二甲酸1.3丙二醇酯（PTT）在乙烯-辛烯共聚物（POE）中原位成纤以及等规聚丙烯（PP)在乙烯-醋酸乙烯共聚物（EVA)中原位成纤。对 PTT/POE、PP/EVA原位成纤复合材料的拉伸比、分散相含量、相容剂、粘度比等因素对微纤形态以及材料性能的影响进行了研究，结果表明:拉伸作用对于微纤的形成至关重要，通过合适的拉伸作用能够制备出长径比较大，分布均匀的微纤。微纤的长径比越大及微纤尺寸越均匀，更有利于提高材料的力学性能以及流变性能。在聚合物基体中随分散相含量增加微纤数目逐渐增加，通过加工工艺的合理设置，二次加工后微纤被成功保存。在微纤增强聚合物中随相容剂含量的增加，纤维与基体相之间界面逐渐模糊，微纤长度和平均直径逐渐减小，直径分布范围变窄，微纤尺寸更加均匀。通过本项目的研究，为制备高性能热塑性弹性体提供一种新方法，