辐射增敏交联聚丙烯片材的超临界二氧化碳发泡  

Foamability of Sensitized Radiation Cross-Linked Polypropylene Sheets with Supercritical Carbon Dioxide as the Foaming Agent

作　　者：李小虎[1,2] 程勇[1,2] 王谋华[2] 杨晨光[2] 邢哲[2] 郭晓亚[1] 

机构地区：[1]上海大学环境与化学工程学院,上海200444 [2]中国科学院上海应用物理研究所,上海201800

出　　处：《功能高分子学报》2015年第4期367-372,共6页Journal of Functional Polymers

基　　金：国家自然科学基金(11079048)

摘　　要：用三羟甲基丙烷三甲基丙烯酸酯（TMPTMA）作为辐射交联增敏剂与聚丙烯（PP）共混制得片材。采用γ-射线辐照PP片材,并利用超临界二氧化碳（scCO_2）发泡技术对PP进行了发泡研究。通过对PP样品的凝胶含量、热性能和黏度分析,研究了γ射线辐照对PP结构和性能的影响;通过扫描电子显微镜对PP泡孔形貌进行观测,分析了γ射线辐射改性对PP片材发泡行为的影响。结果表明：当以TMPTMA为辐射交联增敏剂时,γ射线辐照诱导PP发生交联从而产生凝胶,同时辐照会引起PP裂解导致黏度降低。经γ-射线辐射增敏交联改性后的PP可以获得理想的泡孔结构,对于本研究中PP片材而言,适宜的吸收剂量为10-20kGy,此时对应的凝胶质量分数为25%-35%。当吸收剂量为10kGy时,辐射改性PP的发泡温度范围可达12℃。Polypropylene（PP）was mixed with crosslinking sensitizer trimethylolpropane trimethacrylate（TMPTMA）and then pressed into sheet.The PP sheet was irradiated byγ-rays,and then foamed with supercritical carbon dioxide（scCO_2）.The effects ofγ-rays radiation on the PP structure and properties were investigated by means of gel fraction test,Differential Scanning Calorimeter（DSC）,and Advanced Rheology Expand System（ARES）.The morphology of PP foam was investigated by Scanning Eelectron Microscope（SEM）.Results showed that PP was successfully cross-linked byγ-irradiation with TMPTMA as the crosslinking sensitizer.However,the viscosity of cross-linked PP decreased.The radiation crosslinked PP could be foamed with ideal cell structures.The suitable absorbed dose for crosslinking PP sample was in the range of 10~20kGy,and correspondingly,the gel mass fraction of PP was in the range of 25%~35%.The foaming temperature window of the radiation modified PP with an absorbed dose of 10 kGy was 12℃.

关 键 词：辐射交联 聚丙烯 超临界二氧化碳 发泡 

分 类 号：TQ32[化学工程—合成树脂塑料工业]