Boosting thermal stability and crystallization of closed-loop-recyclable biodegradable poly(p-dioxanone) by end-group regulation  

作　　者：Jin Lei Zhu-Xin Gui Wan-Ting Xiong Gang Wu Si-Chong Chen Yu-Zhong Wang 

机构地区：[1]The Collaborative Innovation Center for Eco-Friendly and Fire-Safety Polymeric Materials(MoE),National Engineering Laboratory of Eco-Friendly Polymeric Materials(Sichuan),State Key Laboratory of Polymer Materials Engineering,College of Chemistry,Sichuan University,Chengdu,610064,China

出　　处：《Science China Chemistry》2024年第2期642-651,共10页中国科学（化学英文版）

基　　金：supported by the National Key R&D Program of China (2021YFB3801904);the National Natural Science Foundation of China (U19A2095);the Institutional Research Fund from Sichuan University (2020SCUNL205);the Fundamental Research Funds for the Central Universities;the 111 Project (B20001)。

摘　　要：A chemically closed-loop-recyclable biodegradable polymer,poly(p-dioxanone)(PPDO),is one of the ideal candidates for single-use plastic products due to its suitability for different application scenarios.Fascinatingly,when PPDO wastes can be collected,its monomer p-dioxanone(PDO) will be obtained through chemical recycling of these wastes;when cannot be collected,the wastes are able to be biodegraded into harmless substances.However,unsatisfied thermal stability and low crystallization rate of PPDO restrict its wider applications.Herein,based on end-group regulation,we simultaneously realized the significant enhancement of thermal stability and crystallization of PPDO through the simple melt processing with tributyl phosphite(TBP) or triphenyl phosphite(TPP).The model reactions were conducted to investigate the reaction mechanism and theoretical products during the preparation of PPDO/phosphite compounds.Two kinds of phosphites were proved to act as the end-capped reagent and chain extender in the melt processing,while TBP presented better reactivity.As a result,the activation energy of thermal decomposition was largely elevated,and the unprecedented T_(5%)(the temperature at a weight loss of 5%) and Tmax(the temperature at a maximum rate of weight loss) of PPDO were obtained,i.e.,T_(5%)of ~330 ℃ and Tmaxof ~385 ℃ in N_(2) atmosphere,T_(5%)of ~240 ℃ and Tmaxof ~317 ℃ in air atmosphere,respectively.Furthermore,the increased crystallization rate,crystallinity,crystalline orderliness,and realizable monomer recovery(yield >90%,purity >99.9%) of PPDO/phosphite compounds were confirmed.

关 键 词：poly(p-dioxanone) PHOSPHITE thermal stability CRYSTALLIZATION end-group regulation 

分 类 号：TQ317[化学工程—高聚物工业]