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<p>Polyphenylene oxide (PPO), an engineering plastic renowned for its low dielectric constant and excellent wave permeability, finds extensive applications in the domain of 5G information transmission. Despite its advantages, the mechanical properties of PPO significantly influence both its performance and longevity during use. To enhance these properties, the incorporation of glass fibers (GF) is a widely adopted practice in industry. A crucial challenge in this area lies in improving the interfacial bonding strength between PPO and GF, as this directly impacts the overall performance of the composite materials. This study employed atom transfer radical polymerization (ATRP) to synthesize a block copolymer of silane coupling agent KH570 (γ-methacryloxypropyl trimethoxysilane) (MPS) and styrene (St). The chemical disparity between blocks enables their directed interfacial assembly into “molecular bridge” architectures, significantly enhancing interfacial adhesion in composites. NMR, FTIR spectroscopy and GPC confirmed the precise composition and narrow dispersity of the copolymers. TGA and DSC revealed exceptional thermal stability, with onset decomposition temperatures exceeding 320&#xa0;°C, compatible with PPO processing (300–320&#xa0;°C). XPS and SEM validated successful GF surface modification. Monofilament tensile and micro-debonding tests demonstrated optimal interfacial enhancement at a copolymer mass concentration of 0.5% and polystyrene (PS) block degree of polymerization (DP) ~200, achieving a 93.92% increase in interfacial shear strength (IFSS) from 4.77 to 9.25&#xa0;MPa for GF/PPO composites. This work not only presents a novel strategy for enhancing the interfacial bonding in GF/PPO composites but also contributes to advancing the practical application of PPO materials in the information age.</p> Graphical Abstract <p></p>

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Interfacial engineering of glass fibers/polyphenylene oxide composites through block copolymer grafting for high dielectric constant applications

  • 期刊论文

  • 发表日期：

    2025年8月12日

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  • Yihang Jin,
  • Luo Luo,
  • Qunfang Lin,
  • Xiaojie Zu,
  • Qian Zhang,
  • Huihuang Ma,
  • Xiaodong Zhou

摘要

Polyphenylene oxide (PPO), an engineering plastic renowned for its low dielectric constant and excellent wave permeability, finds extensive applications in the domain of 5G information transmission. Despite its advantages, the mechanical properties of PPO significantly influence both its performance and longevity during use. To enhance these properties, the incorporation of glass fibers (GF) is a widely adopted practice in industry. A crucial challenge in this area lies in improving the interfacial bonding strength between PPO and GF, as this directly impacts the overall performance of the composite materials. This study employed atom transfer radical polymerization (ATRP) to synthesize a block copolymer of silane coupling agent KH570 (γ-methacryloxypropyl trimethoxysilane) (MPS) and styrene (St). The chemical disparity between blocks enables their directed interfacial assembly into “molecular bridge” architectures, significantly enhancing interfacial adhesion in composites. NMR, FTIR spectroscopy and GPC confirmed the precise composition and narrow dispersity of the copolymers. TGA and DSC revealed exceptional thermal stability, with onset decomposition temperatures exceeding 320 °C, compatible with PPO processing (300–320 °C). XPS and SEM validated successful GF surface modification. Monofilament tensile and micro-debonding tests demonstrated optimal interfacial enhancement at a copolymer mass concentration of 0.5% and polystyrene (PS) block degree of polymerization (DP) ~200, achieving a 93.92% increase in interfacial shear strength (IFSS) from 4.77 to 9.25 MPa for GF/PPO composites. This work not only presents a novel strategy for enhancing the interfacial bonding in GF/PPO composites but also contributes to advancing the practical application of PPO materials in the information age.

Graphical Abstract