Yingchun Liu,Kun Wu,Fubin Luo,Maoping Lu,Fei Xiao,Xiangxiang Du,Shiheng Zhang,Liyan Liang,Mangeng Lu
Inspired by mussels, dopamine was used to modify graphene nanoplatelets (GnPs). The GnPs@polydopamine (GnPs@PDA) fillers were prepared as fillers and polyvinyl alcohol (PVA) composites were fabricated via casting method. Composites exhibited excellent flexibility and tensile strength increased by 12% at 2.5 wt.% GnPs@PDA loading. The thermal conductivity(λ) of the composites reached 13.4 W m −1 K −1 with loading 10 wt.% GnPs@PDA, which was increased by 4300% compared that of PVA. FTIR results of PVA/PDA films showed that PVA OH and C O stretching vibration have shifted, which proved that hydrogen bonds were formed between GnPs@PDA and PVA. The crystallinity of PVA decreased in the composites indicated that hydrogen bonds were formed between the PVA matrix and the PDA. In addition, the interface compatibility between the GnPs@PDA and PVA matrix was enhanced. Thus, an effective thermal conductive network was formed through hydrogen bonds in composites. These results lead a high λ for films.
Tiantian Yang,Zeyi Jiang,Heming Han,Xinzhi Cai,Yuqiao Liu,Xinru Zhang,Xinxin Zhang,Yujie Ren,Jian Hu
Developing thermal management materials with high thermal conductivity (TC) is critical to the microelectronics. Herein, we fabricated high thermal conductive polyvinylidene fluoride (PVDF) composites by using graphene foam (GF) and dopamine modified graphene nanoplatelets (mGNPs) as fillers. The results indicated that mGNPs could weld onto the GF skeleton to repair the structural defects of GF, which is conducive to improving the composite's TC by forming efficient thermal conductive pathways in the matrix. The obtained GF/mGNPs/PVDF composite (GF: 0.27 vol%, mGNPs: 8.82 vol%) exhibited an in-plane TC of 6.32 W m −1 K −1 , which was much higher than that of GF/GNPs/PVDF composite (4.26 W m −1 K −1 ) at the same GF and GNPs contents. The GF/mGNPs/PVDF composites also possessed excellent dimensional stability and mechanical property. The study revealed that welding mGNPs onto GF is an effective method to fabricate high thermal conductive composites.
危险品化学品经营许可证（带存储）