文献类型：期刊文献

英文题名：Melting and non-isothermal crystallization behaviors of polypropylene and polypropylene/montmorillonite nanocomposites under pressurized carbon dioxide

作者：Hu, Dongdong[1];Chen, Jie[1];Zhao, Ling[1];Liu, Tao[1]

机构：[1]E China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, State Key Lab Chem Engn, Shanghai 200237, Peoples R China

年份：2015

卷号：617

起止页码：65

外文期刊名：THERMOCHIMICA ACTA

收录：;EI(收录号：20153501225417);WOS:【SCI-EXPANDED(收录号:WOS:000362381500008)】；

基金：The authors are grateful to Research Fund for the Doctoral Program of Higher Education of China (20130074110013), the 111 Project (B08021) and the Fundamental Research Funds for the Central Universities.

语种：英文

外文关键词：Non-isothermal crystallization kinetics; Polypropylene; Polymer nanocomposites; Carbon dioxide

摘要：Both the melting and non-isothermal crystallization behaviors of polypropylene (PP) and PP/montmorillonite (MMT) nanocomposites under atmospheric N-2 and pressurized CO2 were carefully studied by using high-pressure differential scanning calorimeter (DSC). Jeziorny modified Avrami and Mo's methods were applied to analyze the non-isothermal crystallization kinetics, respectively. The Avrami exponent decreased with CO2 pressure while increased with the addition of nano-MMT. The Mo's methods demonstrated a success for the systems investigated. The cooling rate needed to reach a certain crystallinity (FT) showed that the crystallization rates fluctuated with increasing CO2. This trend was flattened after introducing nano-MMT because of its heterogeneous effects. The activation energy, Ea, decreased with increasing CO2 pressure while increased in the presence of nano-MMT. The overall crystallization rate characterized by the crystallization half-time, to, showed an decrease in PP/MMT nanocomposites, indicating that MMT had significant heterogeneous nucleation effect on enhancing the crystallization rate despite hindering the polymer chain movement. (C) 2015 Elsevier B.V. All rights reserved.