摘要
将聚丙烯(PP)分别与两种高密度聚乙烯(HDPE)共混,并采用超临界二氧化碳(SC-CO2)作为发泡剂进行高压釜发泡,得到PP/HDPE发泡材料。同时考察了PP/HDPE熔体的黏弹性,并研究了其对PP/HDPE发泡材料泡孔结构的影响。结果表明:PP与黏弹性低于其本身的HDPE共混时,随着HDPE含量的增加,熔体的黏弹性逐渐减小,其中当HDPE含量为25%时,能够得到均匀细小的微孔结构;PP与黏弹性高于其本身的HDPE共混时,随着HDPE含量的增加,熔体的黏弹性逐渐增大,但所得PP/HDPE发泡材料的泡孔尺寸、孔隙率却不减反增,且泡孔结构完整。
Polypropylene/high density polyethylene（PP/HDPE） foaming materials were prepared by blending PP with two kinds of HDPE respectively,and foaming in a high-pressure vessel with supercritical carbon dioxide（SC-CO2） as the foaming agent.Meanwhile,viscoelasticity of the PP/HDPE melt was investigated,and the influences of viscoelasticity on cellular structures of the PP/HDPE foaming material were studied in detail.The results show that when blending PP with high viscoelasticity HDPE,viscoelasticity of the melt decreases with the increasing content of HDPE,and an even micro-hole structure can be obtained by adding 25% HDPE; moreover,when blending PP with low viscoelasticity HDPE,viscoelasticity of the melt decreases with the increasing content of HDPE,but cell size and porosity of the PP/HDPE foaming material increases rather than decreases,and the foaming material has the ideal cellular structure.
出处
《塑料科技》
CAS
北大核心
2014年第10期72-76,共5页
Plastics Science and Technology
基金
广东省高等职业教育教学改革立项项目(20130201068)
