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<p>The composition of a new powder epoxy-benzoxazine polymer using epoxy resin DER671 and benzoxazine BA-a obtained from bisphenol A and aniline has been developed. Sheets of vacuum-bag-only (VBO) dry prepregs were obtained by applying a polymer powder in an electrostatic field to a carbon fiber and subsequent vitrification. The optimal composition of the epoxy-benzoxazine polymer (benzoxazine 50 mas%) and its curing mode (180° C—60 min, 220° C—60 min) were established by the methods of DSC, rheology and DMA. A high wettability of carbon fibers with a molten polymer was found, while voids between the yarns remain free. Consolidated plates obtained from VBO dry prepregs have low porosity and high volume fiber content (57.5 ± 1.3%). A test product in the geometry of a double dome, characterized by the absence of defects was obtained according to the selected modes by compression molding from a consolidated plate.</p> Graphical Abstract <p></p>

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Novel carbon-fiber powder benzoxazine-epoxy composites

  • 期刊论文

  • 发表日期：

    2025年4月9日

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  • Liliya M. Amirova,
  • Oskar L. Khamidullin,
  • Gulnaz M. Madiyarova,
  • Dinar A. Balkaev,
  • Igor S. Antipin,
  • Rustem R. Amirov

摘要

The composition of a new powder epoxy-benzoxazine polymer using epoxy resin DER671 and benzoxazine BA-a obtained from bisphenol A and aniline has been developed. Sheets of vacuum-bag-only (VBO) dry prepregs were obtained by applying a polymer powder in an electrostatic field to a carbon fiber and subsequent vitrification. The optimal composition of the epoxy-benzoxazine polymer (benzoxazine 50 mas%) and its curing mode (180° C—60 min, 220° C—60 min) were established by the methods of DSC, rheology and DMA. A high wettability of carbon fibers with a molten polymer was found, while voids between the yarns remain free. Consolidated plates obtained from VBO dry prepregs have low porosity and high volume fiber content (57.5 ± 1.3%). A test product in the geometry of a double dome, characterized by the absence of defects was obtained according to the selected modes by compression molding from a consolidated plate.

Graphical Abstract