PA66扩链改性及其超临界CO_(2)微孔发泡行为研究  

Study on chain⁃extending reaction of PA66 and its supercritical CO_(2)microcellular foaming behavior

作　　者：孙乙博 刘亚宁 芦浩凡 陈士宏[1] 王向东[1] 武丽丽[1] SUN Yibo;LIU Yaning;LU Haofan;CHEN Shihong;WANG Xiangdong;WU Lili(School of Light Industry Science and Engineering,Beijing Technology and Business University,Beijing 100048,China)

机构地区：[1]北京工商大学轻工科学与工程学院,北京100048

出　　处：《中国塑料》2023年第12期41-46,共6页China Plastics

摘　　要：用多官能环氧基扩链剂CE与抗氧剂B215对线形聚酰胺66(PA66)熔融扩链改性,并采用釜压发泡的方法,以超临界CO_(2)为发泡剂制备了一系列不同的微孔CEPA66泡沫。通过差示扫描量热仪、傅里叶变换红外光谱仪、旋转流变仪等表征了样品结晶、储能模量、复数黏度等的变化。结果表明,扩链剂CE的引入形成了支化PA66,CE有效地提高了PA66的熔体强度;优选了CE的添加量获得了高支化、低交联的PA66,并成功制得了PA66微孔泡沫;当CE添加量为4.0份、饱和温度为275℃时,样品泡孔尺寸为23μm、泡孔密度为3.5×10^(9)个/cm^(3)。A multifunctional epoxy chain extender CE and an antioxidant B215 were used to modify linear polyamide 66(PA66)through melting chain extension,and a series of microporous CEPA66 foams were prepared by supercritical CO_(2).The branched PA66 was formed by the introduction of the chain extender CE,and its crystallization behavior,energy-storage modulus,and complex viscosity were characterized by using DSC,FTIR and rotary rheometer.The use of CE effectively improved the melt strength of PA66,and its addition amount was optimized to obtain PA66 with a high branching and low crosslinking degrees.The PA66 microcellular foams were successfully obtained at a saturation temperature of 275℃.Their cell size and cell density are 23μm and 3.5×10^(9)cells/cm^(3),respectively.

关 键 词：聚酰胺66 环氧扩链剂 微孔泡沫 发泡 超临界二氧化碳 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]