PET的解聚-共缩聚“一锅法”合成生物降解高分子的研究  

Synthesis of Biodegradable Polymers by“One Pot”Depolymerization and Polycondensation of PET

作　　者：张红明[1] 赵君宇 高凤翔[1] 刘顺杰[1] 周庆海[1] 王献红[1] Hong-ming Zhang;Jun-yu Zhao;Feng-xiang Gao;Shun-jie Liu;Qing-hai Zhou;Xian-hongWang(Key Laboratory of Polymer Ecomaterials,Changchun Institute of Applied Chemistry,Chinese Academy of Sciences,Changchun 130022)

机构地区：[1]中国科学院长春应用化学研究所,中国科学院生态环境高分子材料实验室,长春130022

出　　处：《高分子学报》2022年第9期1142-1149,共8页Acta Polymerica Sinica

基　　金：国家重点研发计划项目(项目号2021YFD1700700);国家自然科学基金(基金号51988102)资助项目。

摘　　要：发展聚对苯二甲酸乙二醇酯(PET)再生利用新途径是学术界和产业界均十分关注的研究方向,而传统的化学转化法存在着工艺流程长、能耗高的问题.本文利用不同结构的二元醇将PET醇解成低分子量预聚物,然后加入二元酸进一步进行酯化、缩聚,使PET解聚和共聚反应通过“一锅法”完成,省去了复杂、高耗能的单体提纯过程,且PET原料可以100%再生,所制备的高分子材料具有生物降解性能.值得指出的是,选择不同的醇解剂和二元酸可以实现再生高分子材料结构和性能关系的调控.本文提出的“解聚-共缩聚”合成生物降解高分子方法,对推动PET的高值化回收再生有较高参考价值.Poly(ethylene terephthalate)(PET)is one of the five general engineering plastics,with an annual consumption of nearly 70 million tons in the world.How to realize the sustainable development of PET has always been the focus of academic and industrial circles and an important trend in this field is to develop a new way of recycling PET.At present,the biological enzymatic regeneration of PET is still in the initial exploration stage,and there are some insurmountable problems such as low efficiency and poor selectivity.Therefore,the physical degradation or chemical conversion of PET is the most likely way to realize industrial regeneration.Generally,the chemical conversion method of PET is to depolymerize the main chain through alcoholysis reaction to form terephthalic acid(ester)and ethylene glycol monomer,and then a series of complex post-treatment processes such as purification,washing and rectification to make the monomer reach the polymerization level,and finally giving regenerated PET(r-PET)following esterification and polycondensation processes.However,this chemical conversion and regeneration method has a long process flow and high energy consumption.Herein,we propose a“one pot”strategy to recycle of PET by diol-initiated alcoholysis and the successive diacids-triggered esterification and polycondesation.The highlight of the strategy lies in the depolymerization and copolymerization reaction distribution of PET is carried out through the“one pot”method,so as to convert PET into biodegradable polymer materials.The“one pot”method not only eliminates the complex and high energy consumption process of purifying monomers,but also a 100%regeneration of PET recycled material is realized,which meets the basic requirements of sustainable development.It is worth pointing out that choosing different alcoholysis agents and dibasic acids for depolymerization,esterification and co-polycondensation can realize the regulation of the properties of regenerated polymer materials.The method of“depolymerization-poly

关 键 词：聚对苯二甲酸乙二醇酯 化学转化 解聚 共缩聚 生物降解高分子 

分 类 号：TQ323.41[化学工程—合成树脂塑料工业]