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<p>Calcium carbonate (CaCO<sub>3</sub>) is a cost-effective, abundant reinforcing filler for poly(butylene adipate-co-terephthalate) (PBAT) films, but its application is limited by poor interfacial compatibility and aging resistance. In this study, CaCO<sub>3</sub> was modified via monolayer treatment using either stearic acid (SA) or a silane coupling agent (KH560), as well as via co-modification with both agents. The modified CaCO<sub>3</sub> was subsequently melt-blended with PBAT and processed into composite films through blown-film extrusion. Accelerated aging tests demonstrated that PBAT films incorporating co-modified CaCO<sub>3</sub> exhibited superior anti-aging performance. After 120&#xa0;h of aging, the elongation at break in the machine direction (MD) and transverse direction (TD) reached 396% and 346%, respectively, significantly surpassing those of monolayer-modified and pure PBAT films. Notably, the SA/KH560 co-modified films exhibited tensile strengths at least 30% (MD) and 52% (TD) higher than those of control formulations after 360&#xa0;h of aging. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analyses revealed that the co-modified composite films experienced fewer Molecular chain scissions and Maintained a smooth surface morphology without significant cracks or pores after prolonged aging. Additionally, these films displayed optimal hydrophobicity and enhanced UV-shielding properties, contributing to prolonged service Life. The crystallinity of co-modified films was approximately 40% higher than monolayer-modified samples, further confirming the synergistic effect of SA and KH560 in improving the aging resistance of PBAT/CaCO<sub>3</sub> composites.</p>

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Improving the aging resistance of PBAT composite films via Co-modification of calcium carbonate with stearic acid and silane coupling agent

  • 期刊论文

  • 发表日期：

    2025年9月19日

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  • Yuxin Liu,
  • Zhilin Xu,
  • Guangyao Liu,
  • Tianyi Gao,
  • Jing Lu,
  • Libin Wang,
  • Zhenjun Fan

摘要

Calcium carbonate (CaCO3) is a cost-effective, abundant reinforcing filler for poly(butylene adipate-co-terephthalate) (PBAT) films, but its application is limited by poor interfacial compatibility and aging resistance. In this study, CaCO3 was modified via monolayer treatment using either stearic acid (SA) or a silane coupling agent (KH560), as well as via co-modification with both agents. The modified CaCO3 was subsequently melt-blended with PBAT and processed into composite films through blown-film extrusion. Accelerated aging tests demonstrated that PBAT films incorporating co-modified CaCO3 exhibited superior anti-aging performance. After 120 h of aging, the elongation at break in the machine direction (MD) and transverse direction (TD) reached 396% and 346%, respectively, significantly surpassing those of monolayer-modified and pure PBAT films. Notably, the SA/KH560 co-modified films exhibited tensile strengths at least 30% (MD) and 52% (TD) higher than those of control formulations after 360 h of aging. Fourier transform infrared spectroscopy (FTIR) and scanning electron microscopy (SEM) analyses revealed that the co-modified composite films experienced fewer Molecular chain scissions and Maintained a smooth surface morphology without significant cracks or pores after prolonged aging. Additionally, these films displayed optimal hydrophobicity and enhanced UV-shielding properties, contributing to prolonged service Life. The crystallinity of co-modified films was approximately 40% higher than monolayer-modified samples, further confirming the synergistic effect of SA and KH560 in improving the aging resistance of PBAT/CaCO3 composites.