节点文献

聚苯硫醚/聚丙烯原位微纤化共混物结构、形态与性能

The Structure, Morphology and Properties of (Phenylene Sulfide) (PPS)/isotactic Polypropylene (iPP) In-situ Microfibrillar Blend

【作者】 权慧

【导师】 杨鸣波; 李忠明;

【作者基本信息】 四川大学 , 材料加工工程, 2006, 硕士

【摘要】 本工作为国家自然科学基金项目(50103007)的子课题。通过“熔融挤出-热拉伸-淬冷”的方法制备了聚苯硫醚(PPS)/等规聚丙烯(iPP)原位微纤化共混物(MRB),较为系统的研究了PPS/iPP微纤化共混物的形态、结晶性能、流变性能、力学性能及其影响因素。主要研究结果如下: 1) 本论文通过“熔融挤出-热拉伸-淬冷”的方法成功制得PPS/iPP原位微纤化共混物,PPS在体系中形成较好的微纤形态,微纤的特性,例如微纤直径及其分布,主要取决于共混物的组成和热拉伸比(HSR);HSR 一定(8.9)时,PPS含量增加,微纤最大直径变大,但其最小直径基本保持不变,即最小直径与PPS含量无关;PPS含量相同时,微纤化共混物中PPS微纤的直径与普通共混物中PPS粒子的直径相当,甚至大于粒子的直径,这是PPS微纤/粒子破裂和相互聚集相竞争的结果;PPS含量一定(15 wt%)时,随着拉伸比的增加,微纤的最大直径先增大后减小,但其最小直径基本保持不变。 2) 对PPS/iPP原位微纤化共混物非等温结晶的研究发现:PPS/iPP原位微纤化共混物和普通共混物中,PPS微纤/粒子可作为iPP的异相成核剂,在非等温结晶过程中可提高iPP的起始结晶温度,其中,PPS粒子对iPP的诱导作用相对PPS微纤更为显著;对于同一材料,随降温速率的增加,结晶峰变宽且向低温移动,起始结晶温度T0、最大结晶速率温度Tp、最大结晶时间tmax和半结晶时间t 1/2均降低,但过冷度△Tc增加,这是由于较高的过冷度要求聚合物在较短的时间内完成结晶过程,然而结晶又引起更大的过冷度,此外,当试样快速冷却时iPP分子运动跟不上温度的变化;分别采用Ozawa方程和Jeziorny方程来

【Abstract】 This work, as a sub-project to prepare TP/TP in-situ microfibrillar blends through "melt extrusion-hot stretching-quenching" method, granted by National Science Foundation (No.50103007), is attempt to study the preparation, morphology, crystallization, rheology and mechanical properties of PPS/iPP in-situ microfibrillar blend, and the factors influence these properties will be investigated in detail.1) PPS/iPP in-situ microfibrillar blend could be successfully prepared via a "melt extrusion-hot stretching-quenching" process, and well defined PPS microfibrils could be obtained. The microfibrils characteristics, such as diameter and its distribution, were mainly dominated by the composition of the blend and hot stretch ratio (HSR). The microfibrils diameters became larger with the increase of the PPS concentration at a fixed HSR, but the minimum diameters remained constant, that is, the minimum diameter was independent of PPS concentration. The diameter of most PPS particles in the common blend was comparable to even larger than that of the PPS fibrils in the microfibrillar blend at the same PPS content. Increasing the HSR, the maximum diameter first increased and then decreased, while the minimum diameter remained invariable.2) the study of non-isothermal crystallization of PPS/iPP in-situ microfibrillar blend found that: the PPS microfibrils and spherical particles could act as

  • 【网络出版投稿人】 四川大学
  • 【网络出版年期】2007年 03期
  • 【分类号】TB332
  • 【被引频次】3
  • 【下载频次】503
节点文献中: 

本文链接的文献网络图示:

本文的引文网络