Novel Sustainable chemical recycling of green polymers using environmentally benign catalytic process

使用环境友好的催化过程对绿色聚合物进行新型可持续化学回收

基本信息

批准号：
15350095
负责人：
MATSUMURA Shuichi
金额：
$ 9.54万
依托单位：
KEIO UNIVERSITY
依托单位国家：
日本
项目类别：
Grant-in-Aid for Scientific Research (B)
财政年份：
2003
资助国家：
日本
起止时间：
2003 至 2005
项目状态：
已结题

来源：
https://kaken.nii.ac.jp/grant/KAKENHI-PROJECT-15350095/
关键词：
Enzyme Chemical recycling Cyclic oligomer Poly(lactic acid)Lipase Polymerizable oligomer Solid acid Biopolyester

项目摘要

In this study, sustainable chemical recycling of biodegradable poly(lactic acid) and bio-based polymers, which were produced from renewable resources, were developed using environmentally benign catalysts, such as enzymes and solid acids. Also, enzyme-catalyzed synthesis and chemical recycling of biopolythioesters were also studied. Summaries of the results are as follows.(1)Transformation of bio-based polymers into repolymerizable cyclic oligomersEnzyme-catalyzed cyclic oligomerization of poly(butylene adipate) was studied with respect to the basic reaction parameters. It was found that in certain organic solvents cyclic oligomerization was quickly occurred by lipase. The affinities toward lipase as well as the molecular weight of the repolymerization products were significantly influenced by the cyclic oligomer size.(2)Developing of novel chemical recycling of poly(L-lactic acid) using solid acidIt was found that poly(L-lactic acid) was efficiently degraded into oligomers by montmorillonite. The obtained lactic acid oligomer was readily repolymerized by solid state polymerization to regenerate the polylactic acid with a molecular weight of greater than 100,000. Based on these results, sustainable chemical recycling of bio-based polymers was proposed.(3)Novel enzymatic synthesis and properties of polythioestersIt was first found that mercaptocarboxylic acid was readily polymerized by enzyme to produce polythioester with a molecular weight of several ten thousands. Thus produced polythioester showed a higher melting temperature and resistance against organic solvents comparing to those of the corresponding polyoxyesters. Also, a series of polythioesters were produced by the polycondensation of alkanedithiol with alkanedicarobxylic acid, and their chemical recycling was established using an enzyme.

在这项研究中，使用环境良性催化剂（例如酶和固体酸）开发了可生物降解的聚（乳酸）和基于生物的聚合物的可持续化学回收。此外，还研究了酶催化的合成和化学回收。结果的摘要如下。（1）基于基本的反应参数研究了生物基聚合物转化为聚合循环寡聚酶催化的环状循环寡聚的循环寡聚。发现在某些有机溶剂中，脂肪酶迅速发生了循环寡聚。对脂肪酶的亲和力以及重聚合产物的分子量受到环状低聚大小的显着影响。（2）使用固体酸的聚（L-乳酸酸）进行新型化学回收，发现聚（L-乳酸酸）有效地将其降级到寡头中，由单虫菌有效地将其降级到寡头中。通过固态聚合很容易重聚所获得的乳酸低聚物，以大于100,000的分子量再生二乳酸。基于这些结果，提出了生物基聚合物的可持续化学回收。（3）首先发现新型的酶促合成和Polythioestersit的特性，酶很容易通过酶聚合以产生多雄酯，以产生多雄酯，以分子量的分子量为几千千名。因此，与相应的多氧植物相比，产生的聚偏蛋白具有更高的熔化温度和对有机溶剂的抗性。同样，通过烷二硫醇与烷烃甲酸的多敏产生了一系列的聚三个植物，并使用酶建立了化学回收。