CAJ | 학술논문

将超临界气体发泡技术与化学发泡技术联合用于制备多孔材料。采用碳酸氢钠作为化学发泡剂，将聚己内酯与碳酸氢钠挤出共混之后，使用传统注射成型和微注射成型，进行了发泡实验对比。结果表明，物理化学联合发泡用于制备多孔材料具有可行性，化学发泡剂的加入不仅改善了整体发泡效果，还能够作为气泡成核剂促进物理发泡的质量。对于所得结构在一定程度上表现的泡孔相互连通性进行了讨论，同时对泡孔壁面上出现的“网”状结构进行了分析。气泡在成核生长过程中，对于泡孔壁产生多方向拉伸的作用，相邻气泡共同作用于公共壁面，最终导致壁面部分形成“网”状结构。
장초림계기체발포기술여화학발포기술연합용우제비다공재료。채용탄산경납작위화학발포제，장취기내지여탄산경납제출공혼지후，사용전통주사성형화미주사성형，진행료발포실험대비。결과표명，물이화학연합발포용우제비다공재료구유가행성，화학발포제적가입불부개선료정체발포효과，환능구작위기포성핵제촉진물리발포적질량。대우소득결구재일정정도상표현적포공상호련통성진행료토론，동시대포공벽면상출현적“망”상결구진행료분석。기포재성핵생장과정중，대우포공벽산생다방향랍신적작용，상린기포공동작용우공공벽면，최종도치벽면부분형성“망”상결구。
The physical foaming technology of supercritical fluid foaming and chemical foaming technology were combined to fabricate porous structure for polymers. Sodium bicarbonate was used as a chemical foaming agent. Poly(ε-caprolactone) (PCL) was first blended with sodium bicarbonate by a twin screw extruder and pelletized. The different foaming processes were conducted on a conventional injection molding machine and a microcellular injection molding machine separately. The foaming results were investigated by comparing the two methods of injection molding and microcellular injection molding. The results revealed that it was feasible by combining physical foaming and chemical foaming to fabricate porous structure for PCL, whose foaming quality was better than that of only chemical foaming method. The introduction of chemical foaming agent not only improved general foaming, but also served as nucleating agent of the gas bubbles of physical foaming. The interconnectivity of the pores was investigated, as well as the “web” structure on the cell walls. When the bubbles were growing, thecell walls were stretched in different directions, and the mutual wall of neighbored pores was stretched by the pores, therefore the “web” structure was obtained.