超高分子量聚乙烯增韧聚丙烯的“原位复合”增韧机理

STUDY ON THE IN-SITU COMPOSITE MECHANISM FOR TOUGHNING PP WITH UHMWPE

用四螺杆挤出机制备了超高分子量聚乙烯（ＵＨＭＷＰＥ）增韧聚丙烯（ＰＰ）的共混合金、研究发现，合金中ＵＨＭＷＰＥ的形态是由沿其分子链形成的串联微晶粒和松散的分子链段束组成，并在ＰＰ基体中形成一种特殊的物理＂互穿网络＂结构．ＳＥＭ显示了存在于合金断裂形貌中的微晶粒（＜０．２μｍ），而从ＴＥＭ中观察到非晶的ＵＨＭＷＰＥ分子链段束在ＰＰ基体中的连续型分布．本文提出＂原位复合＂增韧机理来解释ＵＨＭＷＰＥ增韧ＰＰ的机制．

The blends of polypropylene (PP) toughened with ultrahigh moledar weight polye thylene(UHMWPE) were prepared through extrusion by the four-screw extruder. The researches of morphologyand structure for blends demonstrated that UHMWPE was constituted by the buy crystal P8theles and theCross-linking molecular chains, which formed the interpenetrating network in PP matrix. The buy crystalparticles (< 0.2μm) in the fractare surface was observed by SEM, and the co-continue phase struture wasobserved in blends through TEM. A novel in-situ composite toughening mechhanism was propond on the basis of this article.