Chem. J. Chinese Universities ›› 2023, Vol. 44 ›› Issue (8): 20230126.doi: 10.7503/cjcu20230126

• Polymer Chemistry • Previous Articles     Next Articles

Single-molecule Force Spectra of Three Typical Semi-aromatic Polyesters

WAN Pengcheng, LU Song, BAO Yu(), CUI Shuxun()   

  1. School of Chemistry,Key Lab of Advanced Technologies of Materials,Ministry of Education,Southwest Jiaotong University,Chengdu 610031,China
  • Received:2023-03-23 Online:2023-08-10 Published:2023-05-05
  • Contact: BAO Yu, CUI Shuxun E-mail:baoyu@swjtu.edu.cn;cuishuxun@swjtu.edu.cn
  • Supported by:
    the National Natural Science Foundation of China(22273079);the Natural Science Foundation of Sichuan Province, China(2022NSFSC1204);the Central Government Guiding Local Science and Technology Development Project of Sichuan Province, China(2022ZYD0043)

Abstract:

The single-chain mechanical properties of three typical semi-aromatic polyesters(polyethylene terephtha-late, polytrimethylene terephthalate, and polybutylene terephthalate) were studied by single-molecule force spectroscopy. The single-chain force-extension curves of these three polyesters obtained in the same liquid environment can be overlapped well, indicating that the small difference in the number of methylene has no significant effect on the inherent elasticity and hydrophilicity of polyesters. This may be because the polyester molecules are very similar in structure and all adopt the random chain conformation in solution. The single-molecule results imply that the differences in physicochemical properties of polyester materials may be due to the changes in the arrangement of chain segments and intermolecular forces when the polymer chains aggregate to form crystals. It is expected this study will provide some theoretical support for the property regulation of polyesters.

Key words: Polyethylene terephthalate, Polytrimethylene terephthalate, Polybutylene terephthalate, Methylene, Single-molecule force spectroscopy

CLC Number: 

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