文献类型：期刊文献

英文题名：Effect of alkyl group on the chain extension of phosphites in polylactide

作者：Meng, Xin[1,2];Zhu, Shengjie[1,2];Gong, Weiguang[1,2];Turng, Lih-Sheng[3,4];Xin, Zhong[1,2];Shi, Guotao[1,2];Peng, Jing[1,2];Shi, Yaoqi[1,2];Chen, Weijie[1,2]

机构：[1]East China Univ Sci & Technol, Shanghai Key Lab Multiphase Mat Chem Engn, Sch Chem Engn, Shanghai, Peoples R China;[2]East China Univ Sci & Technol, Dept Prod Engn, Sch Chem Engn, Shanghai, Peoples R China;[3]Univ Wisconsin, Dept Mech Engn, Madison, WI 53706 USA;[4]Univ Wisconsin, Wisconsin Inst Discovery, Madison, WI 53706 USA

年份：2019

卷号：25

期号：2

起止页码：144

外文期刊名：JOURNAL OF VINYL & ADDITIVE TECHNOLOGY

收录：;EI(收录号：20181304954055);WOS:【SCI-EXPANDED(收录号:WOS:000465022700005)】；

基金：Contract grant sponsor: National Natural Science Foundation of China; contract grant number: 21576086.Contract grant sponsor: Foundation Provided by the Ministry of Science and Technology of the People's Republic of China [the National High Technology Research and Development Program ("863" Program); contract grant number: 2015AA034003.

语种：英文

外文关键词：Polyesters - Plastic products

摘要：Polylactide (PLA), which is synthesized from natural resources and can degrade easier, possesses high mechanical strength, so it is a reasonable substitute for petroleum-based plastics. Phosphites can increase the stability of PLA through chain extension with the hydroxyl and carboxyl groups simultaneously. But there are few reports on the structural effects of phosphites on the chain extension of PLA. In this article, three kinds of phosphites with different amounts of aryl and alkyl groups were used as chain extenders in PLA and were compared in detail. The molecular weights, complex viscosities, and storage moduli of virgin PLA and PLA stabilized by three different phosphites were characterized by gel permeation chromatography and rheometry. The results show that the presence of alkyl groups is not beneficial for chain extension, as the more alkyl groups there are, the worse the chain extension is. Regarding the three phosphite chain extenders added to PLA-triphenylphosphite (TPP), diphenylisooctylphosphite (PTC), and phenyldiisooctylphosphite (PDOP)-the number of alkyl groups in them can be ranked as follows: PDOP > PTC > TPP. Since PDOP had the most alkyl groups, the chain extension of PDOP was the weakest. In addition, the product, which was formed due to the chain extension of PLA and TPP, had some plastication, thus enabling PLA to move more freely and making it easier to process. J. VINYL ADDIT. TECHNOL., 25:144-148, 2019. (c) 2018 Society of Plastics Engineers