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日用化学工业(中英文) ›› 2025, Vol. 55 ›› Issue (5): 625-632.doi: 10.3969/j.issn.2097-2806.2025.05.011

• 开发与应用 • 上一篇    下一篇

包装用可生物降解聚酯材料的制备及性能研究

李鹏鹏1,*(),李武伟2   

  1. 1.郑州信息工程职业学院,河南 郑州 450121
    2.新乡学院,河南 新乡 453003
  • 收稿日期:2024-06-18 修回日期:2025-05-13 出版日期:2025-05-22 发布日期:2025-06-11

Preparation and properties of biodegradable polyester materials for packaging

Pengpeng Li1,*(),Wuwei Li2   

  1. 1. Zhengzhou Information Engineering Vocational College, Zhengzhou, Henan 450121, China
    2. Xinxiang University, Xinxiang, Henan 453003, China
  • Received:2024-06-18 Revised:2025-05-13 Online:2025-05-22 Published:2025-06-11
  • Contact: *E-mail: peng922229@163.com.

摘要:

以钛酸四丁酯作为增溶剂,聚对苯二甲酸乙二醇酯(PET)和聚乳酸(PLA)为原料,通过熔融共混制备了聚乳酸/聚酯体系,研究了PLA的比例对共混物体系微观形貌、热稳定性、力学性能和生物降解性能的影响。研究结果表明:PET和PLA熔融共混形成的共混物具有良好的相容性,未出现明显的界面和团聚现象。PLA质量分数的增加改善了聚乳酸/聚酯共混物的热稳定性能,残炭率随PLA质量分数的增加而降低。PLA质量分数30%的共混物的拉伸强度和断裂延伸率达到了最大值55.1 MPa、16.2%,较纯PET的拉伸强度和断裂延伸率分别提高了39.50%、48.62%,缺口冲击强度为27.9 kJ/m2,较纯PET提高了108.21%,对应的硬度为92 HR。将猪胰腺脂肪酶加入到缓冲液中测试了共混物的生物降解性能,随着PLA质量分数的增大,聚乳酸/聚酯共混物在缓冲液中的生物降解率逐渐增大,降解28 d时,PLA质量分数30%的共混物缺口冲击强度为27.9 kJ/m2,力学性能最优。

关键词: 聚对苯二甲酸乙二醇酯, 聚乳酸, 熔融共混, 生物降解, 热稳定性

Abstract:

In this paper, polylactic acid/polyester system was prepared by melt blending of polyethylene terephthalate (PET) and polylactic acid (PLA) with tetrabutyl titanate as solubilizer. The effects of the proportion of PLA on the micromorphology, thermal stability, mechanical properties and biodegradability of the system were studied. The results show that the blends formed by melt blending of PET and PLA have good compatibility without obvious interface and agglomeration. The thermal stability of polylactic acid/polyester blend is improved with the increase of PLA mass fraction, and the carbon residue rate decreases with the increase of PLA mass fraction. The tensile strength and fracture elongation of PLA blend with 30% mass fraction reach the maximum value of 55.1 MPa and 16.2%, which are 39.50% and 48.62% higher than that of the pure PET, respectively. The notch impact strength is 27.9 kJ/m2, which is 108.21% higher than that of the pure PET. The corresponding hardness is 92 HR. The biodegradation rate of polylactic acid/polyester blend in buffer increases with the increase of PLA mass fraction. At 28 d of degradation, the notch impact strength of the blend with 30% PLA mass fraction is 27.9 kJ/m2, indicating the best mechanical properties.

Key words: polyethylene terephthalate, polylactic acid, melt blending, biodegradation, thermal stability

中图分类号: 

  • TQ323.4