添加LLDPE的聚丙烯开孔发泡性能研究  

Open-cell foam properties of polypropylene with linear low density polyethylene

作　　者：黄英珠[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）》2009年第5期34-39,共6页Journal of Beijing University of Chemical Technology(Natural Science Edition)

基　　金：北京市自然科学基金项目(2093041);天津市自然科学基金项目(08JCYBJC09800)

摘　　要：采用差示扫描量热仪(DSC)和高级流变扩展系统(ARES)对高熔体强度聚丙烯(HMSPP)和线性低密度聚乙烯(LLDPE)进行了测试和表征,并利用自行研制的超临界流体挤出发泡实验装置,对不同配比的HMSPP/LLDPE进行了超临界二氧化碳挤出开孔发泡实验研究。结果表明:LLDPE的结晶温度比HMSPP的低,在发泡温度下,LLDPE相还处于熔融态,而且LLDPE具有较低的熔体弹性和熔体强度,因此LLDPE相易于在发泡过程中形成开孔结构。加入LLDPE,明显提高了PP发泡样品的开孔率,开孔率均大于80%,但当LLDPE质量分数为30%时,发泡材料的开孔率开始降低。Differential scanning calorimetry and an advanced rheometric expansion system have been used to characterize the thermal behavior and rheological properties of high melt strength polypropylene （HMSPP） and linear low density polyethylene （LLDPE）. The extrusion open-cell foam experiments were carried out using a supercritical liquid foam apparatus developed in our laboratory using different proportions of HMSPP/LLDPE. The results showed that the crystallization temperature of LLDPE was lower than HMSPP, so that the LLDPE phase was still in the molten state at the foam temperature. In addition, LLDPE had lower melt elasticity and melt strength. Therefore an LLDPE phase readily formed open-cells in the process of foaming. By adding relatively small amounts of LLDPE, the open-cell content of PP foam samples was significantly increased （ 〉80 % ）. However when the mass content of LLDPE was increased to 30 %, the open-cell content of the foam decreased.

关 键 词：聚丙烯 线性低密度聚乙烯 流变性能 发泡性能 开孔 

分 类 号：TQ325.7[化学工程—合成树脂塑料工业]