超临界CO_2挤出发泡DCP微交联高密度聚乙烯研究  

Extrusion Foaming of DCP Slightly Cross-linked High-density Polyethylene by Supercritical CO_2

作　　者：张玉霞[1] 刘本刚[1,2] 陈云[1] 何路东[1] 王向东[1] 杜中杰[2] 

机构地区：[1]北京工商大学材料与机械工程学院,北京100048 [2]北京化工大学材料科学与工程学院,北京100029

出　　处：《中国塑料》2012年第6期81-86,共6页China Plastics

基　　金：北京市教育委员会科技发展计划面上项目(KM200810011009);2011年大学生科学研究与创业行动计划项目

摘　　要：用过氧化二异丙苯(DCP)对高密度聚乙烯(PE-HD)进行微交联改性,采用熔体强度测定仪、差示扫描量热仪(DSC)对DCP微交联后PE-HD的熔体强度和结晶行为进行了表征。结果表明,添加少量DCP时,熔体强度不仅不能提高,反而下降,但是提高了PE-HD的结晶速率和结晶度;DCP添加量为0.5份时,体系的熔体强度最大,达0.127N,结晶度最低;用CO2的超临界流体作发泡剂对不同含量DCP微交联的PE-HD体系进行挤出发泡,用扫描电子显微镜和真密度计对其挤出发泡行为进行了研究。结果表明,在DCP添加量为0.5份时发泡效果最好,此时的泡孔较小,泡沫材料的密度可达0.5853g/cm3。High-density polyethylene （PE-HD） was slightly cross-linked by various contents of dicumyl peroxide （DCP）. The melt strength and crystallization behavior of the resultants were characterized by Rheotens and DSC. It was shown that low contents of DCP led to the decrease of melt strength of the resultant, but increased their crystallization rates and crystallization degree; while the contents of DCP was 0. 5 phr, the melt strength of the resultant reached its highest value, O. 127 N, and lowest crystallization degree. The resultants were extrusion foamed by supercritical CO2, and the resultant foams were observed by SEM and a density meter. The results showed that while the contents of DCP was 0.5 phr, the foam was endowed with the best cell morphology with the smallest cell size and lowest density of 0. 5853 g/cm3.

关 键 词：高密度聚乙烯 过氧化二异丙苯 超临界流体 挤出发泡 熔体强度 结晶行为 泡孔尺寸 密度 

分 类 号：TQ325.12[化学工程—合成树脂塑料工业]