Effect of Exogenous Carboxyl and Hydroxyl Groups on Pyrolysis Reaction of High Molecular Weight Poly(L-Lactide) under the Catalysis of Tin

Li-Dong Feng; Xin-Chao Bian; Gao Li; Xue-Si Chen

doi:10.1007/s10118-021-2557-4

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Effect of Exogenous Carboxyl and Hydroxyl Groups on Pyrolysis Reaction of High Molecular Weight Poly(L-Lactide) under the Catalysis of Tin

ARTICLE | Updated：2021-05-20

- Effect of Exogenous Carboxyl and Hydroxyl Groups on Pyrolysis Reaction of High Molecular Weight Poly(L-Lactide) under the Catalysis of Tin
- Effect of Exogenous Carboxyl and Hydroxyl Groups on Pyrolysis Reaction of High Molecular Weight Poly(L-Lactide) under the Catalysis of Tin
- Chinese Journal of Polymer Science 2021年39卷第8期页码：966-974
- Affiliations：
  
  a.Key Laboratory of Polymer Ecomaterials, Changchun Institute of Applied Chemistry, Chinese Academy of Sciences, Changchun 130022, China
  b.Jilin Biomedical Polymers Engineering Laboratory, Changchun 130022, China
- Author bio：
  
  xschen@ciac.ac.cn
- Funds：
  
  This work was financially supported by the National Key Research and Development Program of China (No. 2016YFB0302500), the National Natural Science Foundation of China (Nos. 51873209, 51873210, 51773194 and 51973219) and Jilin Scientific and Technological Development Program, China (No. 20200403022SF).
- DOI：10.1007/s10118-021-2557-4
  中图分类号：
- 收稿：2021-01-07，
  
  修回：2021-1-23，
  
  录用：2021-1-25，
  
  网络首发：2021-05-20，
  
  纸质出版：2021-06-18
- Accepted：
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Feng, L. D.; Bian, X. C.; Li, G.; Chen, X. S. Effect of exogenous carboxyl and hydroxyl groups on pyrolysis reaction of high molecular weight poly(L-Lactide) under the catalysis of tin. Chinese J. Polym. Sci. 2021, 39, 966–974

Li-Dong Feng, Xin-Chao Bian, Gao Li, et al. Effect of Exogenous Carboxyl and Hydroxyl Groups on Pyrolysis Reaction of High Molecular Weight Poly(L-Lactide) under the Catalysis of Tin[J]. Chinese Journal of Polymer Science, 2021, 39(8): 966-974.
Feng, L. D.; Bian, X. C.; Li, G.; Chen, X. S. Effect of exogenous carboxyl and hydroxyl groups on pyrolysis reaction of high molecular weight poly(L-Lactide) under the catalysis of tin. Chinese J. Polym. Sci. 2021, 39, 966–974 DOI： 10.1007/s10118-021-2557-4.

Li-Dong Feng, Xin-Chao Bian, Gao Li, et al. Effect of Exogenous Carboxyl and Hydroxyl Groups on Pyrolysis Reaction of High Molecular Weight Poly(L-Lactide) under the Catalysis of Tin[J]. Chinese Journal of Polymer Science, 2021, 39(8): 966-974. DOI： 10.1007/s10118-021-2557-4.

摘要

Abstract

The effect of exogenous hydroxyl

carboxyl groups and/or Sn

on pyrolysis reactions of poly(L-lactide) (PLLA) was investigated by thermogravimetric analysis (TGA). The activation energy (

) of pyrolysis reactions was estimated by the Kissinger-Akahira-Sunose method. The kinetic models were also explored by the Malek method

and the random degradation behavior was determined by comparing the plots of

$$ {{\rm{ln}}}\{-{{\rm{ln}}}[1-{\left(1-w\right)}^{0.5}]\} $$

http://notExist.jpg

versus 1/

for experimental data from TGA with model reactions. The pyrolysis reaction rate of PLLA was affected slightly by exogenous hydroxyl and carboxyl groups at lower levels of Sn with 65−70 mg·kg

−1

but increased appreciably in the presence of extraneous Sn

―COOH/Sn

or ―OH/Sn

. The

values for the pyrolysis reactions of the PLLAs that provided lactide were different under the catalysis of Sn

in different chemical environments because Sn

can form the new Sn-carboxylate and Sn-alkoxide with exogenous carboxyl and hydroxyl groups

which were different in steric hindrance for the formation of activated complex between Sn

and PLLA. Under the catalysis of Sn

a lactide molecule can be directly eliminated selectively at a random position of PLLA molecular chains

and the molecular chain of PLLA cannot change two PLLA fragments at the elimination site of lactide. However

it was regenerated into a new PLLA molecule with the molecular weight reduced by 144 g·mol

−1

关键词

Keywords

references

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