文献类型：期刊文献

中文题名：超临界二氧化碳渗透成核剂至聚乳酸的分散及对基体性能的影响

英文题名：Penetration of Nucleating Agent into Polylactides by Supercritical CO_2

作者：李斌[1];赵玲[1];李大超[1];曹鑫[1];胡丽霞[1];施春辉[1];陆海峰[1]

机构：[1]华东理工大学化学工程联合国家重点实验室,上海200237

年份：2008

卷号：24

期号：6

起止页码：96

中文期刊名：高分子材料科学与工程

外文期刊名：Polymer Materials Science & Engineering

收录：CSTPCD;;EI(收录号：20083111424199);Scopus;北大核心:【北大核心2004】；CSCD:【CSCD2011_2012】；

基金：上海市纳米专项基金(0552nm039)

语种：中文

中文关键词：超临界二氧化碳;聚乳酸;成核剂;冲击强度

外文关键词：supercritical carbon dioxide; polylactides; nucleating agent; crystallization

摘要：通过超临界二氧化碳渗透的方法将成核剂分子输运到聚乳酸基体中,使其达到与传统挤出共混方法相比更为均匀、粒度更小的分散,从而进一步细化聚乳酸的球晶尺寸,改善其结晶行为。球晶尺寸的降低增加了球晶界面的结合强度,提高了聚乳酸的冲击强度。
Nucleating agent, sodium 2, 2-methylene-bis （4, 6-di-tert-butylphenyl） phosphate （NA40）, has been successfully penetrated into polylaetides （PLA） by using supereritieal carbon dioxide as the swelling agent. The polarized microscopy images demonstrate that at the very beginning of crystallization, penetration by seCO2 favors generating more nuclei from a uniformly dispersion of nucleating agent in PLA, while smaller size of spherulite are formed when the crystallization finished. The DSC results also show an increase of the erystallinity of the NA40 penetrated sample, compared with the NA40 blended sample and virgin one. The impact strength and elongation at break are enhanced due to the small sized spherulites.