文献类型：会议论文

英文题名：Effect of supercritical carbon dioxide-assisted nano-scale dispersion of nucleating agents on the crystallization behavior and properties of polypropylene

作者：Li, Bin[3];Hu, Guo Hua[1,2];Cao, Gui Ping[3];Liu, Tao[3];Zhao, Ling[3];Yuan, Wei Kang[3]

机构：[1]Ecole Natl Super Ind Chim, Inst Natl Polytech Lorraine, CNRS, Lab Chem Engn Sci, F-54001 Nancy, France;[2]Maison Univ, Inst Univ France, F-75005 Paris, France;[3]E China Univ Sci & Technol, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

会议论文集：8th International Symposium on Supercritical Fluids

会议日期：NOV 05-08, 2006

会议地点：Kyoto, JAPAN

语种：英文

外文关键词：supercritical carbon dioxide; polypropylene; nucleating agent; nano-dispersion; crystallization kinetics

摘要：This work aims at using supercritical carbon dioxide (scCO(2)) to disperse a nucleating agent, sodium 2,2-methylene-bis (4,6-di-tert-butylphenyl) phosphate. denoted as NA40, in an isotactic polypropylene (PP) on the nanometer scale and at studying the nucleating efficiency of the nano-dispersed NA40 by differential scanning calorimeter (DSC) and polarized optical microscope (POM). The Avrarm equation and a model combining Avrarm equation and Ozawa equation were used to describe the isothermal and non-isothermal crystallization kinetics of the nucleated PP, respectively. The results showed a consistent trend: both the isothermal crystallization rate and the non-isothermal crystallization temperature of the PP in which NA40 was dispersed under SCCO2 were higher than those of the virgin PP and the PP in which the same amount of NA40 was incorporated by a classical extruder compounding process. Moreover, the size of the sphertilites and the haze of the former PP were smaller than those of the virgin PP and the latter. The trend was reversed in terms of flexural and tensile strengths. (c) 2007 Elsevier B.V All rights reserved.