Abstract To achieve high thermal conductivity of polymer-based composites at low filler loading is still a challenge because of the insufficient contact area and incomplete thermal percolation pathway. In this work, PVDF composite membrane with high thermal conductivity is fabricated using polyhedral oligomeric silsesquioxane (POSS) functionalized carbon nanotubes (CNTs) as fillers. Surface modification promotes the uniform dispersion of CNT-POSS in PVDF matrix and enlarges the contact area. Through the thermal analysis of the CNT-COOH/PVDF and CNT-POSS/PVDF composites, the results indicate that the nucleation effect of CNTs increases the crystallinity of the pure PVDF from 42.9% to 51.2%. In addition, the addition of POSS nanoparticles to the CNT-PVDF composites significantly improves its thermal stability, mechanical and thermal conductivity properties. The CNT-POSS/PVDF composite membrane with 15 wt% CNT-POSS presents an extremely high thermal conductivity of 1.12 W/m·K (vs. 0.15 W/m·K for pure PVDF) and exhibits great superiority in comparison with the thermally conductive PVDF-based composites reported before.

中文翻译：

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用于高导热聚偏二氟乙烯复合膜的多面体低聚倍半硅氧烷功能化碳纳米管

摘要 由于接触面积不足和热渗透途径不完整，在低填料负载下实现聚合物基复合材料的高导热性仍然是一个挑战。在这项工作中，使用多面体低聚倍半硅氧烷 (POSS) 功能化碳纳米管 (CNT) 作为填料制备了具有高导热性的 PVDF 复合膜。表面改性促进了 CNT-POSS 在 PVDF 基体中的均匀分散并扩大了接触面积。通过对CNT-COOH/PVDF和CNT-POSS/PVDF复合材料的热分析，结果表明CNT的成核效应使纯PVDF的结晶度从42.9%提高到51.2%。此外，在 CNT-PVDF 复合材料中加入 POSS 纳米颗粒显着提高了其热稳定性，机械和导热性能。含有 15 wt% CNT-POSS 的 CNT-POSS/PVDF 复合膜具有 1.12 W/m·K 的极高热导率（纯 PVDF 为 0.15 W/m·K），与热导率相比具有很大的优势。之前报道的导电 PVDF 基复合材料。