包装用可生物降解聚酯材料的制备及性能研究

doi:10.3969/j.issn.2097-2806.2025.05.011

Abstract

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

CLC Number:

TQ323.4

Pengpeng Li, Wuwei Li. Preparation and properties of biodegradable polyester materials for packaging[J].China Surfactant Detergent & Cosmetics, 2025, 55(5): 625-632.

Figures/Tables 11

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PLA质量分数/%	T_5%/℃	T_10%/℃	T_50%/℃	800 ℃时的残碳量/%
0	351.3	352.9	—	58.2
10	321.8	350.4	508.4	48.3
30	298.7	348.6	402.8	34.6
50	319.7	349.4	403.7	38.2
70	312.7	350.1	399.1	25.1

Preparation and properties of biodegradable polyester materials for packaging

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