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<p>The hardness of composite materials obtained by impregnating nonwoven needle-punched fabrics made of polyethylene terephthalate and polyacetal fibers with an aqueous polyurethane dispersion was studied and depended on the formation of an intermediate layer during the fabric puncture process in which the packing density of fibers oriented parallel to the fabric surface exceeded the packing density of the fibers in the bulk. Polyurethane particles were concentrated predominantly in the intermediate layer. The maximum hardness of composite materials based on fabrics made of fibers of different chemical natures was observed for a degree of impregnation of ~0.1. Increasing the degree of impregnation led to a decrease in the hardness of the composite materials that was associated with limited fiber mobility and the generation of localized stresses during indentation.</p>

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Influence of Fibrous Filler Composition on Hardness of Composite Polishing Material

  • 期刊论文

  • 发表日期：

    2025年9月1日

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  • O. V. Kozhevnikova,
  • A. V. Dedov,
  • A. A. Stepashkin,
  • V. G. Nazarov

摘要

The hardness of composite materials obtained by impregnating nonwoven needle-punched fabrics made of polyethylene terephthalate and polyacetal fibers with an aqueous polyurethane dispersion was studied and depended on the formation of an intermediate layer during the fabric puncture process in which the packing density of fibers oriented parallel to the fabric surface exceeded the packing density of the fibers in the bulk. Polyurethane particles were concentrated predominantly in the intermediate layer. The maximum hardness of composite materials based on fabrics made of fibers of different chemical natures was observed for a degree of impregnation of ~0.1. Increasing the degree of impregnation led to a decrease in the hardness of the composite materials that was associated with limited fiber mobility and the generation of localized stresses during indentation.