设计阶梯状聚硅氧烷/Al2O3纳米复合材料的杂化界面以增强导热性

IF 7.7 2区 材料科学 Q1 MATERIALS SCIENCE, COMPOSITES
Chiara Romeo , Emanuela Callone , Riccardo Ceccato , Francesco Parrino , Giulia Fredi , Alessandra Vitale , Ignazio Roppolo , Roberta Bongiovanni , Massimiliano D'Arienzo , Sandra Dirè
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引用次数: 0

摘要

阶梯状聚硅氧烷(LPSQs)与导热填料相结合,用于开发具有增强导热性(TC)的纳米复合材料(nc)的潜力最近引起了人们的兴趣。虽然早期的研究强调了控制阶梯填料相互作用的重要性,但混合界面对界面热阻和TC的作用仍未得到充分探讨。为了解决这一问题,将具有甲基丙烯酸酯(MA)或氨基(AA)基团功能化的Al2O3纳米颗粒(NPs)掺入具有甲基丙烯酸酯和苯基侧链的LPSQs中,开发出了新型光固化NCs。表征表明,甲基丙烯酸酯转化和交联显著影响TC。此外,阶梯填料界面上的共价和非共价相互作用的性质影响了LPSQs的结构组织和NCs的热行为。在未填充的基质中,由于有效交联,富甲基丙烯酸酯的聚硅氧烷(LPMASQ)显示出最高的TC。MAPSQ(46)的甲基丙烯酸酯与苯基的比例为40/60,显示出稍低的TC,其中减少的聚合被促进传热的π-π堆积所抵消。MA NPs的引入提高了所有体系的TC,特别是在LPMASQ中,与基体的共聚降低了界面热阻。相反,AA NPs具有较低的分散性和较弱的相互作用,影响LPMASQ中的链组织,引入声子散射,降低TC。然而,在像MAPSQ(64)这样的混合lpsq中,甲基丙烯酸酯与苯基的比例为60/40,氨基增强了热扩散率,这表明弱相互作用在聚合有限的基质中是有益的。这些结果强调了调整lpsq侧链组成和NPs表面功能化的关键作用,以平衡界面相互作用并最大化聚合物NCs的热性能,从而实现高级热管理应用。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Engineering the hybrid interfaces in ladder-like Polysilsesquioxane/Al2O3 nanocomposites for enhancing thermal conductivity
The potential of ladder-like polysilsesquioxanes (LPSQs) combined with thermally conductive fillers for developing nanocomposites (NCs) with enhanced thermal conductivity (TC) has recently gained interest. While early studies emphasize the importance of controlling ladder–filler interactions, the role of the hybrid interface on interfacial thermal resistance and TC remains underexplored. To address this gap, novel photocurable NCs were developed by incorporating Al2O3 nanoparticles (NPs) functionalized with methacrylate (MA) or amino (AA) groups into LPSQs bearing methacrylate and phenyl side chains. Characterizations revealed that methacrylate conversion and crosslinking significantly affect TC. Furthermore, the nature of covalent and non-covalent interactions at the ladder-filler interface influences both LPSQs structural organization and NCs thermal behavior. Among unfilled matrices, methacrylate-rich polysilsesquioxane (LPMASQ) displays the highest TC due to effective crosslinking. MAPSQ(46), with a 40/60 methacrylate-to-phenyl ratio, shows slightly lower TC, where reduced polymerization was offset by π-π stacking that promotes heat transfer. The introduction of MA NPs improves TC in all systems, particularly in LPMASQ, where copolymerization with the matrix reduces interfacial thermal resistance. Conversely, AA NPs, with lower dispersibility and weaker interactions, affect chain organization in LPMASQ, introducing phonon scattering and lowering TC. However, in mixed LPSQs like MAPSQ(64), with a 60/40 methacrylate-to-phenyl ratio, amino groups enhance thermal diffusivity, suggesting that weak interactions can be beneficial in matrices with limited polymerization. These results underscore the critical role of tuning both LPSQs side chain composition and NPs surface functionalization to balance interfacial interactions and maximize thermal performance in polymer NCs for advanced thermal management applications.
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来源期刊
Composites Communications
Composites Communications Materials Science-Ceramics and Composites
CiteScore
12.10
自引率
10.00%
发文量
340
审稿时长
36 days
期刊介绍: Composites Communications (Compos. Commun.) is a peer-reviewed journal publishing short communications and letters on the latest advances in composites science and technology. With a rapid review and publication process, its goal is to disseminate new knowledge promptly within the composites community. The journal welcomes manuscripts presenting creative concepts and new findings in design, state-of-the-art approaches in processing, synthesis, characterization, and mechanics modeling. In addition to traditional fiber-/particulate-reinforced engineering composites, it encourages submissions on composites with exceptional physical, mechanical, and fracture properties, as well as those with unique functions and significant application potential. This includes biomimetic and bio-inspired composites for biomedical applications, functional nano-composites for thermal management and energy applications, and composites designed for extreme service environments.
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