典型生物可降解塑料热处理特性及动力学  

Heat treatment characteristics and kinetics of typical biodegradable plastics

作　　者：高康 阮久莉[1] 王艺博 张建强 郭玉文[1] GAO Kang;RUAN Jiu-li;WANG Yi-bo;ZHANG Jian-qiang;GUO Yu-wen(State Key Laboratory of Environmental Protection and Ecological Industry,China Research Academy of Environment Sciences,Beijing 100012,China;Faculty of Geosciences and Environment Engineering,Southwest Jiaotong University,Chengdu 610059,China)

机构地区：[1]中国环境科学研究院国家环境保护生态工业重点实验室,北京100012 [2]西南交通大学地球科学与环境工程学院,四川成都610059

出　　处：《中国环境科学》2024年第1期231-241,共11页China Environmental Science

基　　金：中国环境科学研究院国家环境保护生态工业重点实验室开放基金资助项目(2022KFF-09);中央级公益性科研院所基本科研业务专项(2022YSKY-09)。

摘　　要：为了探究生物可降解塑料在热处理过程中的特性,采用热重分析仪分别在不同升温速率下(10,20和30℃/min)对由聚乳酸(PLA)和聚对苯二甲酸-己二酸丁二酯(PBAT)组成的生物可降解塑料(BP1)的失重特性进行分析,BP1在氮气和空气气氛下的反应过程都非一步完成,主要反应阶段都存在明显的两步失重过程,在氮气和空气气氛下两个主要反应阶段的质量损失率分别达到87.99%~89.64%,84.99%~86.88%,且两反应阶段温度区间存在明显重叠.利用Flynn–Wall–Qzawa(FWO)、Kissinger-Akahira-Sunose(KAS)、Starink三种等转化率法计算动力学参数,得到BP1在氮气气氛下阶段一、阶段二的平均活化能E分别是88.95,90.92kJ/mol,空气气氛下阶段一、阶段二的平均活化能E分别是67.23,91.27kJ/mol;采用积分主图分析法(Master-plots法)基于10℃/min确定其动力学反应机理,表明BP1主要反应阶段均符合随机成核和核生长模型(An),但反应级数有所区别,说明氮气和空气不同气氛,并不会影响其反应机理,只是在活性点位的产生和失活速率快慢方面有所区别.In order to explore the characteristics of biodegradable plastics in the heat treatment process,the weight-loss characteristics of biodegradable plastics(BP1)composed of the polylactide(PLA)and Poly(butyleneadipate-co-terephthalate)(PBAT)were analyzed by thermogravimetric analyzers at different heating rates(10,20 and 30℃/min),and the reaction process of BP1in nitrogen atmosphere and air atmosphere was not completed in one step,and there were obvious two-step weight-loss processes in the main reaction stages.The mass loss rates of the two main reaction stages under nitrogen and air atmosphere reached 87.99%~89.64%and 84.99%~86.88%,respectively,and there was obvious overlap between the temperature ranges of the two reaction stages.The kinetic parameters were calculated by using iso-conversional method of Flynn-Wall-Qzawa(FWO)、Kissinger-Akahira-Sunose(KAS)、Starink,and the average activation energy E of BP1in stage 1 and stage 2 under nitrogen atmosphere was 88.95 and 90.92kJ/mol,respectively,and the average activation energy E of stage 1 and stage 2 under air atmosphere was 67.23 and 91.27kJ/mol,respectively.The kinetic reaction mechanism was determined by Master-plots method based on 10℃/min,which showed that main reaction stage of BP1conformed to the random nucleation and nuclear growth model(An),but the number of reaction stages was different,indicating that the different atmospheres of nitrogen and air did not affect its reaction mechanism,but the generation and inactivation rate of the active point were different.

关 键 词：生物可降解塑料 热处理特性 动力学 等转化率法 机理模型 

分 类 号：X705[环境科学与工程—环境工程]