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
- Chinese Journal of Polymer Science Vol. 39, Issue 8, Pages: 966-974(2021)
- 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：
- DOI：10.1007/s10118-021-2557-4
  CLC：
- Received：07 January 2021，
  
  Revised：2021-1-23，
  
  Accepted：25 January 2021，
  
  Online First：20 May 2021，
  
  Published：18 June 2021
- 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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