Influence of Mineral Powder Types on Mechanical and Emission Properties of Poly(Butylene Adipate-co-Terephthalate)/Polylactic Acid Blends

CHEN Yezhong, GONG Dejun, FU Xuejun, LI Jianjun, ZENG Xiangbin, OUYANG Chunping

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Plastics Science and Technology ›› 2025, Vol. 53 ›› Issue (02) : 97-102. DOI: 10.15925/j.cnki.issn1005-3360.2025.02.018
Biological and Degradable Material

Influence of Mineral Powder Types on Mechanical and Emission Properties of Poly(Butylene Adipate-co-Terephthalate)/Polylactic Acid Blends

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Abstract

The melt-blending method was employed to prepare blends of poly(butylene adipate-co-terephthalate) (PBAT), polylactic acid (PLA), and inorganic mineral powders, with the aim of investigating the effects of different mineral powders on the mechanical and emission properties of PBAT/PLA films. The results showed that when the particle size of talcum powder was sufficiently small, the tensile strength of the corresponding PBAT/PLA film was superior to that of PBAT/PLA films containing the same amount of calcium carbonate. As the D50 particle size of talcum powder increased from 2.5 μm to 10 μm, the tensile strength of the PBAT/PLA film in both the longitudinal and transverse directions gradually decreased. Tear and dart impact tests revealed that PBAT/PLA films containing calcium carbonate exhibited the best toughness. This is because calcium carbonate is generally surface-treated with stearic acid, which effectively disperses it within the matrix and allows it to effectively bear external stress during tearing. As the particle size of talcum powder increased, the toughness of the PBAT/PLA film decreased. Mica, whiskers, and wollastonite showed poor dispersion in the blend system, resulting in numerous defect points on the film surface and poor toughness of the PBAT/PLA film. PBAT/PLA films filled with talcum powder had a lower overall odor level compared to those filled with calcium carbonate, and exhibited a milder "oil stain" phenomenon after fogging. However, high-particle-size talcum powder, as well as mica, whiskers, and wollastonite, generated significant shear forces with the matrix during blending, leading to higher levels of total volatile organic compounds (TVOC) and certain volatile organic compounds (VOCs).

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Poly(butylene adipate-co-terephthalate) / Polylactic acid / Mineral powder / Odor / Volatile organic compounds

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CHEN Yezhong , GONG Dejun , FU Xuejun , et al . Influence of Mineral Powder Types on Mechanical and Emission Properties of Poly(Butylene Adipate-co-Terephthalate)/Polylactic Acid Blends. Plastics Science and Technology. 2025, 53(02): 97-102 https://doi.org/10.15925/j.cnki.issn1005-3360.2025.02.018

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