دانلود رایگان مقاله اثر هم افزایی BN و گرافن نانوصفحات بر تقویت خواص حرارتی مواد مرکب

Abstract

In this work, we reported a synergistic effect of boron nitride nanosheets (BNNSs) with graphene in the 3D BNNSs/graphene framework (BGF) on the enhancement of thermal conductive properties of polyamide-6 (PA6) composites. The 3D BGF was self-assembled by embedding BNNSs into 3D graphene framework (GF). And the PA6 composites were obtained by in-situ polymerization of PA6 chains in the pores of the 3D framework. The thermal conductivity (TC) of PA6 composites with BGF (1.6 wt% BNNS/6.8 wt% graphene) was improved to 0.891 W·m−1·K−1. This value indicated that additional introduction of 1.6 wt% BNNSs could increase the TC up to 87.6% and 350% compared with the composites containing 6.8 wt% 3D GF (0.475 W·m−1·K−1) and neat PA6 (0.196 W·m−1·K−1), respectively. The high efficiency of BNNSs on the TC enhancement could be attributed to the factors including the unobstructed 3D thermal conductive paths constructed by BNNSs, and the morphology-promoted synergistic effect between BNNSs and graphene nanosheets.

4. Conclusion

In the present work, we prepared a hybrid 3D framework as thermal conductive filler in polymeric composites. We demonstrated the synergistic effect of BNNSs and graphene in the thermal conductive. An additional introduction of 1.6 wt% BNNSs could increase the TC up to 87.6% and 350% higher comparing with the composites containing 6.8 wt% graphene and neat PA6. The synergistic originated from the 3D hybrid framework: (1) BNNSs arranged to be a 3D thermal conductive path by using the 3D GF as a template; (2) BNNSs could patch up the defects of graphene sheets. The strategy of grafting PA6 chains to 3D hybrid framework made the layer filler dispersed uniformly without surface modification and improved the compatibility between filler and matrix. Finally, The TC of PA6 composite was improved efficiently due to the synergistic effect between BNNSs and graphene. Our work provides a new insight into the fabrication of composites with high performance for versatile applications in electronic device, hightemperature dielectric and energy store.