PP/POE共混物的热行为与晶态结构  

Thermal Behaviors and Crystalline Structure of PP/POE Blends

作　　者：郭峰[1] 应继儒[1] 彭少贤[2] 解孝林[1] 

机构地区：[1]华中科技大学化学系 [2]湖北工业大学化学与环境工程学院,湖北武汉430068

出　　处：《高分子材料科学与工程》2007年第6期156-159,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重大项目(20490220);塑性成形模拟及模具技术国家重点实验室开放课题(05-10)资助

摘　　要：采用双螺杆挤出机熔融共混制备了不同组成的聚丙烯(PP)/乙烯-辛烯弹性体(POE)共混物,利用差示扫描量热仪、偏光显微镜和广角X射线衍射系统研究了共混物的热行为与晶态结构。结果表明PP与POE之间具有一定的相容性,POE的异相成核作用提高了共混物中PP的结晶温度和结晶速率,有效地诱导β晶型PP的形成,增大了共混物中α晶型和β晶型PP的晶面表观厚度。另一方面,由于POE与PP之间存在较强的相互作用,POE大分子链使PP分子链的扩散和堆积受阻,从而导致PP/POE共混物总结晶度的降低。PP/POE blends were prepared with polypropylene （PP） and ethylene-octene copolymer （POE） by a twin-screw extruder in melting state. Their thermal behaviors and crystalline structure were characterized by differential scanning calorimetry （DSC）, polarized optical microscopy （POM） and wide angle X-ray diffraction （WAXD）. The results show that PP is compatible with POE, the heterogeneous nucleation of POE increases the crystallization temperature and rate, induces the formation of β-form PP, and increases the apparent crystalline lamellar thickness of PP. In the other hand, the diffusion motion and packing of PP macromolecular chains during crystallization are blocked by POE due to the strong interaction between PP and POE. Thereby, the degree of crystallinity for PP/POE blends decreases.

关 键 词：聚丙烯 乙烯-辛烯弹性体 热行为 晶态结构 

分 类 号：O631.31[理学—高分子化学]