The present study reports on the development of a new binary filler system for rubber composites, SiO2@Al2O3, where Al2O3 sheets are grown onto SiO2 nanoparticles aggregates by a sustainable water‐based soft‐chemistry approach. The aim is to synergistically integrate the intrinsic thermal conductivity properties of Al2O3 with the peculiar reinforcement ability of SiO2 in an easy one‐pot solution, which has been exploited to prepare polybutadiene (PB) model composites by a simple solvent casting technique. More in detail, the binary filler was used as‐prepared or suitably surface functionalized with 3‐(Trimethoxysilyl)propylmethacrylate (TMSPM). The filler compatibilization and interplay with the polymeric matrix have been inspected by solid state NMR in conjunction with scanning electron microscopy. These investigations highlighted that the presence of alumina in the binary filler does not undermine the capability of silica in generating polymer chains stiffening and indicated a significant effect of the silanization in providing better filler networking and interaction with the PB host ensuring, in principle, an enhanced thermal transport. Accordingly, thermal conductivity measurements revealed that SiO2@Al2O3 introduction in PB induces a remarkable upgrade of the heat transfer, which becomes much more relevant upon surface modification with TMSPM. These results appear encouraging, paving the possibility of applying SiO2@Al2O3 model system to more complex case studies, where both improved thermal conductivity and enhanced reinforcement are required, such as tires tread formulations.Highlights A new SiO2@Al2O3 binary filler system was proposed following a soft‐chemistry approach. The binary filler was functionalized to enhance its compatibilization. Fillers were dispersed in polybutadiene by a simple solvent casting technique. Thermal conductivity measurements revealed a remarkable upgrade of the heat transfer ability.

中文翻译：

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SiO2@Al2O3 二元填料：增强轮胎应用橡胶复合材料热传输的机会

本研究报告了用于橡胶复合材料的新型二元填料系统 SiO 的开发2@艾尔2氧3，其中阿尔2氧3薄片生长在 SiO2 上2纳米粒子通过可持续的水基软化学方法聚集。目的是协同整合铝的固有导热性能2氧3具有SiO2特有的补强能力2一种简单的一锅式解决方案，已被用来通过简单的溶剂浇铸技术制备聚丁二烯（PB）模型复合材料。更详细地说，二元填料按原样使用或用甲基丙烯酸 3-(三甲氧基甲硅烷基)丙酯 (TMSPM) 进行适当的表面功能化。通过固态核磁共振结合扫描电子显微镜检查了填料的相容性以及与聚合物基质的相互作用。这些研究强调二元填料中氧化铝的存在不会削弱二氧化硅产生聚合物链硬化的能力，并表明硅烷化在提供更好的填料网络和与 PB 主体的相互作用方面具有显着效果，原则上确保增强热传输。因此，热导率测量表明 SiO22@艾尔2氧3PB 中的引入导致传热显着升级，这在使用 TMSPM 进行表面改性时变得更加相关。这些结果似乎令人鼓舞，为应用 SiO 铺平了可能性2@艾尔2氧3模型系统到更复杂的案例研究，其中需要提高导热性和增强强化，例如轮胎胎面配方。亮点 新的二氧化硅2@艾尔2氧3二元填料系统是按照软化学方法提出的。 二元填料被官能化以增强其相容性。 通过简单的溶剂浇铸技术将填料分散在聚丁二烯中。 热导率测量显示传热能力显着提升。