Carbon nitride has captured much attention of researchers since it was discovered, while few studies have focused on exploring the thermal conduction applications. In this paper, carbon nitride nanosheets (CNNS) could be simultaneously functionalized during the process of exfoliation. FTIR tests proved that hydrogen bonds were constructed between PVA matrix and CNNS, at the same time, superior dispersion were also observed from SEM characterizations. In this case, significantly improved compatibility at the interfaces of them could be achieved without additional modifications. The maximum in-plane thermal conductivity of CNNS/PVA composites was enhanced to 2.7 W m⁻¹ K⁻¹ with low CNNS content (7.5 wt%), resulting in a sharp enhancement (785%) in comparison with that of pure PVA film (0.305 W m⁻¹ K⁻¹). More importantly, the as-prepared CNNS/PVA composite (at 7.5 wt% CNNS content) could even be comparable to traditional highly thermally conductive polymer composites (Graphene, Boron Nitride, Mxene, etc., were used as fillers) in terms of similar conditions. Meanwhile, the incorporation of 7.5 wt% CNNS PVA composites also showed excellent mechanical properties and electrical insulation, where the tensile strength, elongation at break, and volume resistivity reached up to 30.578 Mpa, 193.089%, 3.34 × 10¹¹ Ω·cm respectively. These multifunctional features further indicate that CNNS/PVA composites possess the great potential for thermal management. Therefore, this work can provide effective references to prepare highly thermally conductive polymer composites by constructing in-situ functionalized CNNS, and expands its application as well.

氮化碳自被发现以来就受到了研究人员的广泛关注，而很少有研究专注于探索热传导应用。在本文中，氮化碳纳米片（CNNS）可以在剥离过程中同时进行功能化。FTIR 测试证明 PVA 基体和 CNNS 之间构建了氢键，同时从 SEM 表征也观察到优异的分散性。在这种情况下，无需额外修改即可显着提高它们接口的兼容性。CNNS/PVA 复合材料的最大面内热导率提高到 2.7 W m ^-1 K ^-1CNNS 含量低 (7.5 wt%)，与纯 PVA 薄膜 (0.305 W m ^-1 K ^-1 )相比，显着增强 (785% )。更重要的是，所制备的 CNNS/PVA 复合材料（7.5 wt% CNNS 含量）甚至可以与传统的高导热聚合物复合材料（石墨烯、氮化硼、Mxene 等用作填料）在相似的状况。同时，掺入 7.5 wt% CNNS PVA 复合材料也表现出优异的机械性能和电绝缘性，拉伸强度、断裂伸长率和体积电阻率分别达到 30.578 Mpa、193.089%、3.34 × 10 ¹¹Ω·cm 分别。这些多功能特征进一步表明 CNNS/PVA 复合材料具有巨大的热管理潜力。因此，该工作可为通过构建原位功能化CNNS制备高导热聚合物复合材料提供有效参考，并拓展其应用。