气体辅助注射成型聚苯乙烯制品的双折射  

Birefringence in Polystyrene Part Molded by Gas Assisted Injection Molding

作　　者：韩健[1] 申长雨[1] 沈亚强[1] 郑国强[1] 陈静波[1] 刘春太[1] 

机构地区：[1]郑州大学橡塑模具国家工程研究中心,河南郑州450002

出　　处：《高分子材料科学与工程》2008年第11期134-137,共4页Polymer Materials Science & Engineering

基　　金：国家自然科学基金重大项目(10590352)

摘　　要：利用偏光显微镜结合补偿器方法测定了气体辅助注射(GAIM)聚苯乙烯制品中双折射分量Δn和nθθ-nrr的径向分布。结果表明,Δn与nθθ-nrr在模壁附近均具有最大值并下降,当降低到一定值时Δn值朝向气道方向变化较小,而nθθ-nrr值在气道附近呈上升趋势。通过与常规注射成型(CIM)对比,初步探讨了GAIM特殊的流场和保压行为对制品双折射分布的影响。Birefringence distribution in gas-assisted injection molding （GAIM） parts was measured by polarizing microscope with Berek compensator. It is found that birefringence △n and nθθ-nπ both show a maximum value at the outer wall of the parts and then decline near the outer wall. When the value drops to a certain point, △n becomes nearly constant down to the gas channel, but nθθ-nπ increases toward the gas channel, which is contributed to the thermal-induced birefringenee. Compared with the birefringenee distribution of conventional injection molding （CIM）, the peculiar flow and packing behavior caused by gas penetration on birefringenee distribution of GAIM was elucidated.

关 键 词：气体辅助注射成型 双折射 取向 气体穿透 

分 类 号：TQ320.662[化学工程—合成树脂塑料工业]