动态毛细管流变仪中正弦脉动挤出流场对聚丙烯结晶结构的影响  

Crystallization Behavior of Polypropylene in Capillary Dynamic Rheometer Under the Sine Pulsating Flow Field

作　　者：何光建[1] 瞿金平[1] 何和智[1] 

机构地区：[1]华南理工大学聚合物新型成型装备国家工程研究中心

出　　处：《中国塑料》2004年第8期60-64,共5页China Plastics

基　　金：国家自然科学基金资助项目 ( 2 0 0 740 10和 2 0 0 2 70 0 2 );教育部博士点项目基金资助项目 ( 19990 5 610 9)

摘　　要：采用自行研制的动态毛细管流变仪研究了正弦脉动挤出流场对聚丙烯结晶行为的影响 ,动态毛细管流变仪中正弦脉动挤出后的聚丙烯在室温冷却结晶后 ,通过DSC测试、X射线衍射分析了振动频率和振幅与聚丙烯结晶结构的关系。研究发现 ,随着振幅的增加 ,聚丙烯结晶度增大 ,DSC曲线中熔融峰由 164 .5℃升高到 167.4℃且分裂为双峰 ,低温峰面积逐渐减小、高温峰面积所占比例逐渐增大 ;当振动频率增大时 ,熔融峰的位置反而有降低的趋势。WAXD测试表明 ,聚丙烯的α晶型没有发生明显变化 ,晶粒的尺寸减小。The self-made capillary dynamic rheometer was adopted to study the relationship between the crystallization behavior of polypropylene (PP) and the different vibration conditions in the sine pulsating flow field. The crystalline structure changes of PP extruded under different vibration conditions and cooled in air were characterized by using differential scanning calorimeter and wide-angle X-ray diffractometer (WAXD) techniques. It was found that the sine pulsating field in the capillary dynamic rheometer could affect the crystallization behavior of PP obviously. With the increase of the vibration amplitude, the degree of crystallinity of PP increased; the melt peaks went up to 167.4 ℃ from 164.5 ℃ and divided into double peaks; the area of the peak at high temperature increased. However, the position of melt peaks lowered with the increase of the frequency. The WAXD showed that the α-form crystal of PP extruded from the capillary dynamic rheometer kept the same, but the crystallite size decreased. This proved a large increase in the number of small crystals.

关 键 词：聚丙烯 动态毛细管流变仪 正弦脉动流场 结晶结构 

分 类 号：TQ320.663[化学工程—合成树脂塑料工业]