注射成型PP沿流动方向的形态和冲击性能  

Morphology and impact property of injection-molded PP along the flow direction

作　　者：郑国强[1] 张荣正[1] 亓永峰[1] 刘春太[1] 申长雨[1] 

机构地区：[1]郑州大学材料科学与工程学院,橡塑模具国家工程研究中心,河南郑州450002

出　　处：《合成树脂及塑料》2008年第5期50-51,65,共3页China Synthetic Resin and Plastics

基　　金：国家自然科学基金项目(10590332,10772164);河南自然科学基金项目(0612002000)

摘　　要：研究了注射成型聚丙烯(PP)的形态结构及冲击强度沿流动方向上的变化。偏光显微镜照片表明,皮层的厚度沿流动方向逐渐减小。X射线衍射结果表明,在流动方向各位置处α晶型占主导地位,β晶型含量沿流动方向逐渐减小。这种变化趋势导致PP的冲击强度沿流动方向逐渐减小。This paper studied the variation in morphology and impact property of injection-molded polypropylene （PP） along the flow direction. The polarized light microscopic photographs indicate that the skin thickness gradually diminishes along the flow direction. The X-ray diffractometric analysis reveals that o,-phase prepon- derates in all positions along the flow direction whereas the fraction of β-phase decreases gradually in the same direction. This variation trend in crystal structure leads to a gradual reduction in impact strength of the PP article along the flow path.

关 键 词：聚丙烯 注射成型 形态结构 冲击强度 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]