【作者】 徐鸿升；

【导师】 李忠明；

【作者基本信息】 四川大学 ， 材料加工工程， 2006， 硕士

【摘要】 通用塑料高性能化是当前及今后较长一段时间内高分子材料科学与工程领域的重要的研究课题。高分子的共混和合金是改善塑料性能的有效的方法之一，共混物中分散相形态又是影响材料最终力学性能的重要因素，纤维的形态更有利于分散向传递载荷达到增强的目的。在课题组前期的研究工作中发现，通过热拉伸的方法使通用工程塑料(GEP)在通用塑料PO如聚乙烯PE、聚丙烯PP等中形成了良好的微纤形态，相对于普通共混物来说原位微纤复合材料(in-situ microfibrillar reinforced composite，MRC)得到了明显的增强的效果。此外，这种原位微纤复合材料还有望成为解决目前塑料回收的良好方法。尽管前期的工作中对于微纤化共混物的力学性能、结晶性能等作了较为系统的研究，但是，对微纤化共混物的流变特性至今为止仍然了解较少。然而，研究材料的流变行为对材料的加工性能和指导材料的工艺参数设定具有重要的指导意义，此外，微纤化共混物的流变性能又和微纤的形态和性质密切相关，对流变性能的研究可以更好的理解共混物在不同条件下的微观结构。本论文通过“熔融挤出—热拉伸—淬冷”的方法，制备了以高密度聚乙烯(HDPE)为基体相，分别以通用工程塑料聚碳酸酯(PC)、聚对苯二甲酸乙二醇酯(PET)和PET／弹性体HT共混物为微纤相的原位微纤化共混物，对微纤化共混物的形态和流变性能进行了较为系统的研究。主要的结果如下： (1) 对PC／HDPE和PET／HDPE微纤化共混物进行了形态的观察。尽管PC更多还原

【Abstract】 Properties improvement of general plastics is one of the important research fields of polymer materials science and engineering at present and in the coming long period of times. Blending and alloying have long been demonstrated to be an effective way to improve properties of an existing polymer. In the recent researches of our group, the in-situ microfibrillar reinforced composites based on the engineering plastics (GEP) and polyolefins (PO) have been fabricated by a slit die extrusion, hot stretching, and quenching process. It has been proved that the microfibrillar composites have better mechanical properties than common blends. Furthermore, the microfibrillar reinforced composites are also good potential materials for the plastic recycle. However, there is little research on the rheological behaviors of GOP/PO microfibrillar composites previously. Rheology behaviors of microfibrillar composites are necessary to investigate for the decision of processing conditions and final properties of material, because they are closely related to the morphology and micro-structure of microfibrillar composites. In this master dissertation, the microfibrillar composites, which base on the high density polyethylene (HDPE) as matrix, polycarbonate (PC), polyethylene terephthalate (PET), PET/thermoplastic elastomer HT blends as microfibrillar phase, respectively, have been successful manufactured. The rheology and morphology of them have更多还原