Crystallization Behavior and Properties of Poly(butylene terephthalate) Modified with Diethylene Glycol

Xi Wang; Xue-kuan Ma; Li-ping Guo; Jin-jun Yang; Xiao-ming Liang; Teng-jiao Hu; Peng-ju Pan; Ying Zheng

doi:10.11777/j.issn1000-3304.2025.25047

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Crystallization Behavior and Properties of Poly(butylene terephthalate) Modified with Diethylene Glycol

Research Article | 更新时间：2025-07-28

- Crystallization Behavior and Properties of Poly(butylene terephthalate) Modified with Diethylene Glycol
- Acta Polymerica Sinica Vol. 56, Issue 8, Pages: 1449-1461(2025)
- 作者机构：
  
  1.天津理工大学环境科学与安全工程学院天津 300384
  2.浙江大学化学工程与生物工程学院化学工程联合国家重点实验室杭州 310058
  3.华峰集团有限公司温州 325200
  4.浙江华峰瑞讯生物材料有限公司温州 325200
- 作者简介：
  
  Jin-jun Yang, E-mail: tjyjj_2014@tjut.edu.cn
- 基金信息：
- DOI：10.11777/j.issn1000-3304.2025.25047
  CLC：
- CSTR：32057.14.GFZXB.2025.7401
- Received：24 February 2025，
  
  Accepted：17 April 2025，
  
  Published Online：28 May 2025，
  
  Published：20 August 2025
- 稿件说明：
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王茜, 马学宽, 郭利平, 杨进军, 梁晓明, 胡腾蛟, 潘鹏举, 郑映. 二乙二醇改性聚对苯二甲酸丁二醇酯的结晶行为与性能. 高分子学报, 2025, 56(8), 1449-1461

Wang, X.; Ma, X. K.; Guo, L. P.; Yang, J. J.; Liang, X. M.; Hu, T. J.; Pan, P. J.; Zheng, Y. Crystallization behavior and properties of poly(butylene terephthalate) modified with diethylene glycol. Acta Polymerica Sinica, 2025, 56(8), 1449-1461
王茜, 马学宽, 郭利平, 杨进军, 梁晓明, 胡腾蛟, 潘鹏举, 郑映. 二乙二醇改性聚对苯二甲酸丁二醇酯的结晶行为与性能. 高分子学报, 2025, 56(8), 1449-1461 DOI： 10.11777/j.issn1000-3304.2025.25047. CSTR： 32057.14.GFZXB.2025.7401.

Wang, X.; Ma, X. K.; Guo, L. P.; Yang, J. J.; Liang, X. M.; Hu, T. J.; Pan, P. J.; Zheng, Y. Crystallization behavior and properties of poly(butylene terephthalate) modified with diethylene glycol. Acta Polymerica Sinica, 2025, 56(8), 1449-1461 DOI： 10.11777/j.issn1000-3304.2025.25047. CSTR： 32057.14.GFZXB.2025.7401.

摘要

为改善聚对苯二甲酸丁二醇酯(PBT)材料的脆性，以对苯二甲酸二甲酯、丁二醇和二乙二醇(DEG)为单体，通过熔融缩聚制备了不同共聚组成的聚对苯二甲酸丁二醇/二乙二醇酯(PBDT)共聚酯，系统研究了其结晶行为、耐热性能、力学性能、降解性能以及拉伸场下的多层次结构演化. 结果表明，与PBT相比，DEG单元的引入显著降低共聚酯的熔点和结晶能力，但不改变其晶型结构. PBDT共聚酯的热分解温度有所提升，同时展现出优异的力学性能，尤其是断裂伸长率显著高于PBT. 在80 ℃拉伸过程中，PBT和PBDT共聚酯的晶型结构保持不变，但相比于PBT，PBDT共聚酯中更容易形成晶体取向和空洞. DEG单元的引入加快PBDT共聚酯的降解速率，归因于共聚酯结晶度的降低和亲水性的提高.

Abstract

In order to improve the brittleness of poly(butylene terephthalate) (PBT) materials

poly(butylene diethylene glycol terephthalate) (PBDT) copolyesters with varying compositions were synthesized through melt-polycondensation

using dimethyl terephthalate

butanediol

and diethylene glycol (DEG) as monomers. The crystallization behavior

thermal

mechanical

and degradation properties

as well as the hierarchical structural evolution during stretching of PBDT copolyesters were systemically investigated. The results show that

the incorporation of DEG units significantly reduces the melting temperature and crystallization ability of the copolyesters compared to PBT

but does not alter their crystal structures. The thermal decomposition temperature of PBDT copolyesters is increased

and they exhibit excellent mechanical properties

particularly a significantly higher elongation at break compared to PBT. The crystal structures of both PBT and PBDT copolyesters remain unchanged during stretching at 80 ℃. However

crystal orientation and cavitation are more easily formed in the PBDT copolyesters compared to PBT. The incorporation of DEG units also enhances the degradation rate of the PBDT copolyesters

which is attributed to the reduced crystallinity and increased hydrophilicity of the copolyesters.

关键词

Keywords

references

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