China Plastics ›› 2025, Vol. 39 ›› Issue (8): 88-93.DOI: 10.19491/j.issn.1001-9278.2025.08.014

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Influence of surface⁃modified hydrotalcite with various coupling agents on the properties of PVC

ZHANG Ning1,2,3(), LI Xianming4, LI Gaihua1,2,3, ZHANG Hongxia1,2,3, YANG Xiaochun1,2,3, YU Jing1,2,3   

  1. 1.Department of Chemistry,Tangshan Normal University,Tangshan 063000,China
    2.Hebei Key Laboratory of Degradable Polymers,Tangshan 063000,China
    3.Tangshan Silicone Key Laboratory,Tangshan 063000,China
    4.School of Physical Science and Technology,Tangshan Normal University,Tangshan 063000,China
  • Received:2024-09-10 Online:2025-08-26 Published:2025-07-30

Abstract:

The surface of magnesium⁃aluminum⁃lanthanum carbonate hydrotalcite was modified via a wet method using four coupling agents: aluminum ester, titanium ester, aluminum⁃titanium composite, and silane. The effects of modification temperature and modifier dosage on activation degree were investigated. Fourier⁃transform infrared spectroscopy, X⁃ray diffraction, and scanning electron microscopy confirmed that the coupling agents only modified the hydrotalcite surface organically without altering its layered crystal structure. The modified hydrotalcite significantly reduced particle agglomeration, enhancing its dispersion in poly(vinyl chloride) (PVC). Thermal stability and mechanical properties of the PVC composites were evaluated using Congo red testing, thermal aging, thermogravimetric analysis, and mechanical testing. Results indicated that the modified hydrotalcite delayed PVC thermal degradation and improved elasticity and toughness. The aluminum⁃titanium composite coupling agent exhibited the most efficient modification, requiring the least dosage while achieving optimal performance. Compared to unmodified hydrotalcite, the initial decomposition temperature of PVC increased by 44 °C, while tensile strength and impact strength improved by 34% and 17%, respectively.

Key words: poly(vinyl chloride), coupling agent, hydrotalcite, surface modification

CLC Number: