振动剪切诱导茂金属全同立构聚丙烯生长γ晶  

Oscillatory Shear Induced γ-Phase Growth of Metallocene-Made Isotactic Polypropylene

作　　者：王艳[1] 潘吉林[1] 钟淦基[1] 陈妍慧[1] 李忠明[1] 

机构地区：[1]四川大学高分子科学与工程学院,高分子材料工程国家重点实验室,四川成都610065

出　　处：《高分子材料科学与工程》2010年第6期111-113,118,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金资助项目(50527301)

摘　　要：采用普通注射成型(CIM)和振动保压注射成型(OPIM)两种方法制备茂金属全同立构聚丙烯(m-iPP)试样。利用二维广角X射线衍射(2D-WAXD)和差示扫描量热法(DSC)分别表征试样从表层到芯层的晶体结构和热行为。结果表明:(1)γ晶的相对含量是温度场控制和剪切场诱导共同作用的结果。慢的冷却速率有利于γ晶形成,剪切取向一定程度抑制分子链的折叠有利于γ晶形成;(2)DSC与2D-WAXD的试验结果有很好的一致性。The influence of temperature and oscillatory shear on the formation of γ-phase in metallocene-made isotactic polypropylene （m-iPP） has been investigated by two dimension X-ray diffraction （2D-WAXD） and differential scanning calorimetery （DSC）.From skin to core,the amount of the γ-phase raises continuously in samples fabricated by conventional injection molding （CIM）,which is mainly due to the thermodynamic factor.Interestingly,when sample was fabricated by oscillatory packing injection molding （OPIM）,the amount of the γ-phase raises as a wave-like pattern from skin to core as a result of the competition between the thermodynamically controlled and oscillatory shear induced crystallization.The result of 2D-WAXD and DSC show the same changing tendency from skin to core.

关 键 词：茂金属全同立构聚丙烯 振动注射成型 剪切 γ晶 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]