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.
出处
《高分子材料科学与工程》
EI
CAS
CSCD
北大核心
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)
关键词
气体辅助注射成型
双折射
取向
气体穿透
gas assisted injection molding
birefringenee
orientation
gas penetration
