Al-Harthi Mamdouh A, Hussain Manwar
Department of Chemical Engineering, King Fahd University of Petroleum and Minerals, Dhahran 31261, Saudi Arabia.
Department of Materials and Chemical Engineering, Erica Campus, Hanyang University, Ansan 15588, Korea.
Polymers (Basel). 2022 Jul 22;14(15):2976. doi: 10.3390/polym14152976.
The nanocomposites of poly(vinylidene fluoride) (PVDF) with pristine graphene nanoflakes (GNF) and a multi-wall carbon nanotube (MWCNT) were prepared by the solution casting method. Additionally, the GNF and MWCNT were functionalized by acid treatment, and nanocomposites of the acid-treated MWCNT/GNF and PVDF were prepared in the same method. The effect of the acid treatment of MWCNT and GNF on the mechanical, thermal and thermo-oxidative stability and the thermal conductivity of the MWCNT/GNF-PVDF nanocomposites was evaluated, and the results were compared with the untreated MWCNT/GNF-PVDF nanocomposites. In both cases, the amount of GNF and MWCNT was varied to observe and compare their thermal and mechanical properties. The functionalization of the GNF or MWCNT resulted in the change in the crystallization and melting behavior of the nanocomposites, as confirmed by the differential scanning calorimetry analysis. The addition of the functionalized GNF/MWCNT led to the improved thermal stability of the PVDF nanocomposites compared to that of the non-functionalized GNF/MWCNT-PVDF nanocomposites. The thermal and electrical conductivity of the functionalized and non-functionalized GNF/MWCNT-PVDF composites were also measured and compared. The functional groups, crystal structure, microstructure and morphology of the nanocomposites were characterized by Fourier transformed infrared spectroscopy (FTIR), X-ray diffraction (XRD) and scanning electron microscopy (SEM), respectively.
采用溶液浇铸法制备了聚偏氟乙烯（PVDF）与原始石墨烯纳米片（GNF）及多壁碳纳米管（MWCNT）的纳米复合材料。此外，通过酸处理对GNF和MWCNT进行功能化，并采用相同方法制备了酸处理的MWCNT/GNF与PVDF的纳米复合材料。评估了MWCNT和GNF的酸处理对MWCNT/GNF-PVDF纳米复合材料的机械、热和热氧化稳定性以及热导率的影响，并将结果与未处理的MWCNT/GNF-PVDF纳米复合材料进行比较。在这两种情况下，均改变GNF和MWCNT的用量以观察和比较它们的热性能和机械性能。差示扫描量热分析证实，GNF或MWCNT的功能化导致纳米复合材料的结晶和熔融行为发生变化。与未功能化的GNF/MWCNT-PVDF纳米复合材料相比，添加功能化的GNF/MWCNT可提高PVDF纳米复合材料的热稳定性。还测量并比较了功能化和未功能化的GNF/MWCNT-PVDF复合材料的热导率和电导率。分别通过傅里叶变换红外光谱（FTIR）、X射线衍射（XRD）和扫描电子显微镜（SEM）对纳米复合材料的官能团、晶体结构、微观结构和形态进行了表征。
