A non-destructive method using low-field nuclear magnetic resonance for characterizing the molecular weight of PBAT during thermo-oxidative degradation

Fang Hou; Zhenlin Jiang; Min Zhu; Yang Liu; Keyu Zhu; Jiamin Xu; Chaosheng Wang; Huaping Wang

Polymer Testing (Dec 2023)

A non-destructive method using low-field nuclear magnetic resonance for characterizing the molecular weight of PBAT during thermo-oxidative degradation

Fang Hou,
Zhenlin Jiang,
Min Zhu,
Yang Liu,
Keyu Zhu,
Jiamin Xu,
Chaosheng Wang,
Huaping Wang

Affiliations

Fang Hou: College of Chemistry and Chemical Engineering, Research Center for Advanced Mirco- and Nano-Fabrication Materials, Shanghai University of Engineering Science, Shanghai, 201620, PR China
Zhenlin Jiang: College of Chemistry and Chemical Engineering, Research Center for Advanced Mirco- and Nano-Fabrication Materials, Shanghai University of Engineering Science, Shanghai, 201620, PR China; Science and Technology on Advanced Ceramic Fibers and Composites Laboratory, National University of Defense Technology, Changsha, 410073, PR China; Key Laboratory of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai, 201620, PR China; Corresponding author. College of Chemistry and Chemical Engineering, Research Center for Advanced Mirco- and Nano-Fabrication Materials, Shanghai University of Engineering Science, Shanghai, 201620, PR China.
Min Zhu: College of Chemistry and Chemical Engineering, Research Center for Advanced Mirco- and Nano-Fabrication Materials, Shanghai University of Engineering Science, Shanghai, 201620, PR China
Yang Liu: College of Chemistry and Chemical Engineering, Research Center for Advanced Mirco- and Nano-Fabrication Materials, Shanghai University of Engineering Science, Shanghai, 201620, PR China
Keyu Zhu: College of Chemistry and Chemical Engineering, Research Center for Advanced Mirco- and Nano-Fabrication Materials, Shanghai University of Engineering Science, Shanghai, 201620, PR China
Jiamin Xu: College of Chemistry and Chemical Engineering, Research Center for Advanced Mirco- and Nano-Fabrication Materials, Shanghai University of Engineering Science, Shanghai, 201620, PR China
Chaosheng Wang: Key Laboratory of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai, 201620, PR China
Huaping Wang: Key Laboratory of High Performance Fibers & Products, Ministry of Education, Donghua University, Shanghai, 201620, PR China

Journal volume & issue: Vol. 129
p. 108256

Abstract

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The molecular weight is an important indicator for assessing the aging of polymers. However, existing methods for characterizing the molecular weight of polymers involve complex procedures and destructive tests. Therefore, efficient, rapid, and non-destructive testing methods would be a key development in material degradability evaluation. In this paper, we studied the thermo-oxidative aging process of polybutylene adipate terephthalate (PBAT) using a low-field nuclear magnetic resonance (LF-NMR) analysis method. The degradation mechanism of PBAT during thermo-oxidative aging is characterized by its low-field nuclear magnetic resonance decay curve and inversion curve. A two-component LF-NMR fitting analysis reveals that the thermo-oxidative degradation of PBAT conforms to a random fracture mechanism. Furthermore, a correlation between number average molecular weight and LF-NMR relaxation time during thermo-oxidative degradation of PBAT was constructed, with a correlation coefficient R2 greater than 0.97. The error between the correlation equation used in the molecular weight detection of PBAT and the actual test is less than 10%, indicating that it is feasible and reliable to characterize the number average molecular weight of materials by applying the LF-NMR relaxation time.

Published in Polymer Testing

ISSN: 0142-9418 (Print); 1873-2348 (Online)
Publisher: Elsevier
Country of publisher: United Kingdom
LCC subjects: Technology: Chemical technology: Polymers and polymer manufacture
Website: https://www.journals.elsevier.com/polymer-testing

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