热塑性聚酰胺弹性体的扩链反应及发泡行为研究  

Study on Chain Extension and Foaming Behaviors of Thermoplastic Polyamide Elastomer

作　　者：温慧 马宇飞 信春玲[1,2] 何亚东[1,2] WEN Hui;MA Yufei;XIN Chunling;HE Yadong(College of Mechanical and Electrical Engineering,Beijing University of Chemical Technology,Beijing 100029,China;Engineering Research Center for Polymer Processing Equipment,Ministry of Education,Beijing 100029,China)

机构地区：[1]北京化工大学机电工程学院,北京100029 [2]高分子材料加工装备教育部工程研究中心,北京100029

出　　处：《中国塑料》2021年第10期14-20,共7页China Plastics

摘　　要：采用环氧型扩链剂KL-E4370对热塑性聚酰胺弹性体(TPAE)进行了扩链改性,通过旋转流变仪、差示扫描量热仪(DSC)和扫描电子显微镜(SEM)等对扩链前后TPAE的流变性能、结晶性能和发泡性能进行了表征,并研探讨了扩链反应的机理。结果表明,TPAE的熔体黏弹性较差,可发性差;加入扩链剂能够有效提高TPAE的支化程度;通过对TPAE进行扩链改性可使其复数黏度增加一个数量级以上,提高熔体黏弹性,从而增大发泡倍率,拓宽发泡温区,改善泡孔破裂及合并问题;但扩链后TPAE的结晶性能下降,起始结晶温度降低20℃左右,使得泡孔收缩情况明显;扩链剂含量为1%(质量分数,下同)的TPAE泡沫的发泡倍率从纯TPAE的5.5倍增加到了约9倍,泡孔直径达50μm。In this study,an epoxy-type chain extender(KL-E4370)was used to modify the thermoplastic polyamide elastomer(TPAE). The rheological,crystalline,and foaming properties of TPAE before and after the chain extension were investigated using a rotating rheometer,differential scanning calorimeter and scanning electron microscope,and the corresponding chain extension reaction was studied,too. The results indicated that the molten TPAE has poor thermal and foaming properties. The introduction of chain extender can effectively increase the branching level of TPAE. After modification,the complex viscosity of TPAE was increased by more than one order of magnitude,the foaming rate was increased,the foaming temperature zone was widened,and the bubble rupture and merging problems were effectively overcome. However,the crystallization performance of TPAE decreased,and the initial crystallization temperature decreased by about 20 ℃,resulting in obvious shrinkage of the bubble. When the content of chain extender was 1 wt%,the foaming rate of TPAE increased from 5. 5 times to approximately 9 times,and the diameter of the bubble reached 50 μm.

关 键 词：热塑性 聚酰胺 弹性体 扩链 发泡 

分 类 号：TQ323.[化学工程—合成树脂塑料工业]