文献类型：期刊文献

中文题名：工艺温度对超临界CO2发泡聚丙烯泡孔结构的影响

英文题名：Effect of Foaming Temperature on Cell Structure of Foamed Polypropylene Using Supercritical CO_2

作者：张壮[1];许治昕[1];郑安呐[1];管涌[1]

机构：[1]华东理工大学材料科学与工程学院,超细材料制备与应用教育部重点实验室,上海200237

年份：2010

卷号：36

期号：5

起止页码：655

中文期刊名：华东理工大学学报（自然科学版）

外文期刊名：Journal of East China University of Science and Technology

收录：CSTPCD;;Scopus;北大核心:【北大核心2008】；CSCD:【CSCD2011_2012】；

基金：国家自然科学基金(50573020)

语种：中文

中文关键词：超临界CO2;聚丙烯;发泡;泡孔结构

外文关键词：supercritical CO2; polypropylene; foaming; cell structure

摘要：以自制的高熔体强度聚丙烯为原料,利用超临界流体技术制备了聚丙烯发泡材料。重点考察了发泡温度对所得聚丙烯泡孔结构的影响。结果表明：155-170℃为适宜发泡的温度区间,随着温度的降低,泡孔密度增加,平均泡孔直径减小;当发泡温度为160℃时,泡孔密度、平均泡孔直径和表观密度依次分别为1.03×107cell/cm3、73.86μm和0.016 g/cm3,此时发泡倍率最大,达到55倍;温度通过影响聚丙烯的结晶速率、熔体的黏弹性以及发泡剂在聚丙烯熔体中的溶解度和扩散系数等来控制泡孔结构和发泡倍率。
The foamed PP was prepared by using supercritical CO_2 with self-made high melt-strength polypropylene as starting material.Effect of foaming temperature on cell structure was studied.The results indicate that a suitable foaming temperature zone,from 155 ℃ to 170 ℃,was gained.Cell density increases gradually with the decreasing of foaming temperature,while average cell diameter changes along the opposite trend.When the foaming temperature is 160 ℃,cell density,average cell diameter and apparent density are 1.03×107 cell/cm3, 73.86 μm and 0.016 g/cm3 respectively.Furthermore,foam expansion ratio reached the largest,about 55 times.Foaming temperature controlled the cell structure and foam expansion ratio by influencing the crystallization rate,viscoelasticity as well as the solubility and diffusivity of the blowing agents in the polypropylene melt.