聚丙烯/聚乙烯共混物的粘弹性及其对挤出发泡的影响  

The effect of polypropylene/polyethylene(PP/PE) blends viscoelasticity on PP foaming

作　　者：侯雁婷[1] 何亚东[1] 李庆春[1] 信春玲[1] 

机构地区：[1]北京化工大学机电工程学院,北京100029

出　　处：《北京化工大学学报（自然科学版）》2013年第3期50-55,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：国家科技支撑计划(2011BAD24B01)

摘　　要：以聚丙烯(PP)与4种聚乙烯(低密度聚乙烯(LDPE)、线性低密度聚乙烯(LLDPE)、高密度聚乙烯(HDPE)、热塑性弹性体(TPE))共混物作为原料,采用超临界二氧化碳作为发泡剂,在同向双螺杆挤出机-熔体泵发泡系统上进行挤出发泡实验。同时,运用旋转流变仪测试了LDPE、LLDPE、HDPE、TPE与PP共混对其流变性能的影响。结果表明,HDPE/PP、TPE/PP共混体系的储能模量较大、零切黏度较大,使用这两种发泡体系可以得到泡孔尺寸小、泡孔均匀性好的发泡制品,且制品泡孔致密,泡孔破裂及合并现象较少。The effect of four different kinds of polyethylene（PE）—low-density polyethylene（LDPE）,linear low density polyethylene（LLDPE）,high-density polyethylene（HDPE） and thermoplastic elastomer（TPE）—on polypropylene（PP） foaming has been analyzed based on a large number of PP foaming experiments carried out using a self-designed supercritical liquid foaming apparatus,four kinds of PP/PE blends as a matrix and supercritical carbon dioxide（SCCO2） as the foaming agent.The rheological behavior of the PP/PE blends was investigated with a rheometer.The results showed that the storage modulus and viscosity of the HDPE/PP and TPE/PP blends were higher than the corresponding values for the LDPE/PP and LLDPE/PP blends,which gave the benefits of reduced cell rupture and coalescence,thus affording higher quality products.

关 键 词：聚丙烯 聚乙烯 粘弹性 泡孔结构 流变 

分 类 号：TQ328[化学工程—合成树脂塑料工业]