发泡工艺及超临界二氧化碳诱导结晶作用对聚碳酸酯发泡行为的影响  

Effects of Foaming Process and Supercritical Carbon Dioxide Induced Crystallization on Foaming Behavior of Polycarbonate

作　　者：吴志昂 郑晓平 龚莉雯 王璠 杨子程 张利[1] 包锦标 WU Zhi’ang;ZHENG Xiaoping;GONG Liwen;WANG Fan;YANG Zicheng;ZHANG Li;BAO Jinbiao(School of Material Science and Chemical Engineering,Ningbo University,Ningbo 315211,China)

机构地区：[1]宁波大学材料科学与化学工程学院,宁波315211

出　　处：《材料导报》2020年第8期200-204,共5页Materials Reports

基　　金：宁波市自然科学基金(2017A61005);王宽诚幸福基金。

摘　　要：采用超临界二氧化碳(scCO2)发泡制备聚碳酸酯(PC)微孔材料,系统研究了饱和温度、饱和压力、饱和时间以及scCO2对PC的诱导结晶作用对其发泡行为的影响。通过调节发泡工艺制备了不同发泡倍率的PC发泡材料,用扫描电镜(SEM)观察泡孔形貌,结果表明,除了发泡温度和压力影响发泡行为外,饱和时间对PC发泡也具有较大影响。通过广角X射线衍射(WAXD)仪研究不同饱和时间下发泡材料的结晶度后发现,在一定温度和压力下,scCO2会诱导聚碳酸酯结晶,且结晶度随时间的延长而增加,而晶区的存在严重限制泡孔生长。只有在合适的饱和温度、饱和压力及饱和时间下,才能得到均匀分布的聚碳酸酯发泡材料。In this work,polycarbonate(PC)microcellular foams were prepared by supercritical carbon dioxide(scCO2)foaming technology.The effects of saturation temperature,saturation pressure,saturation time as well as polycarbonate crystallization induced by scCO2 on foaming beha-vior were systematically studied.PC foams with various expansion ratio were prepared by tuning foaming parameters,and the cell structures were observed by SEM.It was found that not only the foaming parameters of foaming temperature,scCO2 pressure but also scCO2 saturation time affec-ted PC foaming behavior.Moreover,scCO2 saturation time is the main influencing factor to PC foaming behavior.The crystallization behavior of foams was investigated by wide-angle X-ray diffraction.It was indicated that polycarbonate crystallization could be induced at a certain temperature and pressure,and the crystallinity increased with saturation time increasing,which restricts the cell growth.Therefore,a uniform cell structure of PC foams could be obtained at a certain temperature,pressure and saturation time.

关 键 词：聚碳酸酯 超临界二氧化碳 泡孔形貌 诱导结晶 

分 类 号：TQ328[化学工程—合成树脂塑料工业]