聚酰胺6扩链改性及其超临界CO_(2)模压发泡研究  

Chain Extension Modification and Mold Foaming Process with Supercritical CO_(2)of Polyamide 6

作　　者：陈鹏鹏 许志美[1] 胡冬冬[1] 刘涛[1] 赵玲[1,2] Chen Pengpeng;Xu Zhimei;Hu Dongdong;Liu Tao;Zhao Ling(State Key Laboratory of Chemical Engineering,East China University of Science and Technology,Shanghai 200237,China;School of Chemistry&Chemical Engineering,Xin Jiang University,Urumqi 830046,China)

机构地区：[1]华东理工大学化学工程联合国家重点实验室,上海200237 [2]新疆大学化学化工学院,乌鲁木齐820046

出　　处：《工程塑料应用》2021年第4期8-14,共7页Engineering Plastics Application

基　　金：国家重点研发计划项目(2016YFB0302200)。

摘　　要：以扩链剂KL–E4370、抗氧剂1010对线型尼龙6(PA6)进行改性,制备出具有高熔体强度的改性PA6材料。采用固态发泡的发泡方法,通过超临界CO_(2)模压发泡制备相应发泡材料。通过差示扫描量热仪,流变仪来表征改性材料的可发泡性,并通过扫描电子显微镜来观测发泡材料的泡孔形貌。探究不同工艺条件对PA6泡沫泡孔结构的影响,分析了不同泡孔结构对发泡材料力学性能的影响。在饱和压力为10~20 MPa、发泡温度为223~231℃的范围内制备的PA6泡沫泡孔直径在18.3~143.6μm之间,泡孔密度为7.42×10^(6)~1.75×10^(9)个/cm^(3),发泡倍率为5.6~22.4。所得PA6泡沫的拉伸强度为1.5~5.8 MPa,断裂伸长率为22%~51%,压缩强度为0.03~2.47 MPa。Linear PA6 was modified with chain extender KL–E4370 and antioxidant 1010 to prepare modified PA6 materials with high melt strength.The foams were prepared by supercritical CO_(2)mold foaming process with the methods of semi-solid-state foaming.The foamability of the modified materials was characterized by differential scanning calorimetry and rheological test,and the cell morphologies of the foams were observed by scanning electron microscope.The effects of different process conditions on the cell structure were explored,and the effects of different cell structures on the mechanical properties of foamed materials were analyzed.The PA6 foams with cell sizes ranging from 18.3–143.6μm,cell density ranging from 7.42×10^(6)–1.75×10^(9)cell/cm^(3),and expansion ratio from 5.6–22.4 were obtained by controlling the saturation pressure in the range of 10 to 20 MPa and foaming temperature 223–231℃.The range of the tensile strength of the PA6 foams was 1.5–5.8 MPa,the range of the elongation at break was 22%–51%,and the range of the compressive strength was 0.03–2.47 MPa.

关 键 词：聚酰胺6 扩链 模压发泡 泡孔形貌 力学性能 

分 类 号：TQ323.6[化学工程—合成树脂塑料工业]