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中文摘要：
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△n和nθθ—nπ的径向分布。结果表明，△n与nθθ-nπ在模壁附近均具有最大值并下降，当降低到一定值时△n值朝向气道方向变化较小，而nθθ-nπ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。
英文摘要：
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.
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Gas-assisted Injection Molded Polypropylene/Glass Fiber Composite: Foaming Structure and Tensile Str
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