Materials for heat sinks in automotive heat dissipation systems must demonstrate both high thermal conductivity and stress resistance during assembly. This research proposes a composite material, comprised of thermally conductive ceramic fillers and matrix resins, as a suitable option for such application. The strategy for designing this material interface is directed with Hansen solubility parameters (HSP). A composite material featuring a honeycomb-like structure made of poly(methyl methacrylate) (PMMA) and boron nitride (BN) particles was successfully fabricated through press molding. This yielded a continuous BN network exhibiting high thermal conductivity and moderate mechanical strength. The HSP evaluation led to the suggestion of introducing highly polar functional groups into the matrix resin to enhance the affinity between PMMA resin and BN fillers. In line with this recommendation, a nitrile (CN) group─a highly polar group─was introduced to PMMA (CN-PMMA), significantly enhancing the composite’s maximum bending stress without noticeably degrading other properties. Surface HSP evaluation through contact angle measurements revealed an “interface enrichment effect”, with the CN groups concentrating at the resin―filler interface and effectively interacting with the surface functional groups on the BN particles, which resulted in an increase in the maximum bending stress. These findings emphasize the advantage of employing HSP methodologies in designing high-performance composite materials.

中文翻译：

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利用汉森溶解度参数进行材料设计，提高氮化硼和聚甲基丙烯酸甲酯树脂高导热复合材料的机械性能


汽车散热系统中的散热器材料必须在装配过程中表现出高导热性和抗应力性。这项研究提出了一种由导热陶瓷填料和基体树脂组成的复合材料，作为此类应用的合适选择。设计该材料界面的策略以汉森溶解度参数 (HSP) 为指导。通过压制成型成功制备了由聚甲基丙烯酸甲酯（PMMA）和氮化硼（BN）颗粒制成的具有蜂窝状结构的复合材料。这产生了具有高导热性和中等机械强度的连续氮化硼网络。 HSP评估提出在基体树脂中引入高极性官能团以增强PMMA树脂和BN填料之间的亲和力。根据这一建议，在 PMMA (CN-PMMA) 中引入了腈 (CN) 基团（一种高极性基团），显着提高了复合材料的最大弯曲应力，而不会明显降低其他性能。通过接触角测量的表面HSP评估揭示了“界面富集效应”，CN基团集中在树脂-填料界面，并与BN颗粒上的表面官能团有效相互作用，导致最大弯曲应力增加。这些发现强调了采用 HSP 方法在设计高性能复合材料时的优势。