文献类型：期刊文献

英文题名：Influence of chain extension on the compatibilization and properties of recycled poly(ethylene terephthalate)/linear low density polyethylene blends

作者：Zhang, Yue[1];Cuo, Weihong[1];Zhang, Hongsheng[1];Wu, Chifei[1]

机构：[1]E China Univ Sci & Technol, Sch Mat Sci & Engn, Polymer Alloy Lab, Shanghai 200237, Peoples R China

年份：2009

卷号：94

期号：7

起止页码：1135

外文期刊名：POLYMER DEGRADATION AND STABILITY

收录：;EI(收录号：20092212098109);WOS:【SCI-EXPANDED(收录号:WOS:000267815700014)】；

基金：Thanks for the financial assistance of National Natural Science Foundation of China (20574019).

语种：英文

外文关键词：Recycled poly(ethylene terephthalate); Linear low density polyethylene; Polymeric methylene diphenyl diisocyanate; Chain extension; Compatibilization

摘要：Polymeric methylene diphenyl diisocyanate (PMDI) was added as chain extender to a blend of recycled poly(ethylene terephthalate) (R-PET) and linear low density polyethylene (LLDPE) with compatibilizer of maleic anhydride-grafted poly(styrene-ethylene/butadiene-styrene) (SEBS-g-MA). Hydroxyl end groups of PET can react with both isocyanate groups of PMDI and maleic anhydride groups of SEBS-g-MA, which are competing reactions during reactive extrusion. The compatibility and properties of the blends with various contents of PMDI were systemically evaluated and investigated. WAXD results and SEM observations indicated that chain extension inhibits the reaction between PET and SEBS-g-MA. As the PMDI content increased, the morphology of dispersed phase changed from droplet dispersion to rodlike shape and then to an irregular structure. The DSC results showed that the crystallinity of PET decreased in the presence of PMDI, and the glass transition temperature (T-g) of PET increased with addition of 0-0.7 w% PMDI. The impact strength of the blend with 1.1 w% PMDI increased by 120% with respect to the blend without PMDI, accompanied by only an 8% tensile strength decrease. It was demonstrated that the chain extension of PET with PMDI in R-PET/LLDPE/SEBS-g-MA blends not only decreased the compatibilization effect of SEBS-g-MA but also hindered the crystallization of PET. (C) 2009 Elsevier Ltd. All rights reserved.