Yu Yansong, Hu Yiwen, Song Xiuduo, Chen Jinyao, Kang Jian, Cao Ya, Xiang Ming
State Key Laboratory of Polymer Materials Engineering, Polymer Research Institute, Sichuan University, Chengdu 610065, China.
Key Laboratory of Combustion and Explosion Technology, Xi'an Modern Chemistry Research Institute, Xi'an 710065, China.
Polymers (Basel). 2023 Sep 19;15(18):3821. doi: 10.3390/polym15183821.
In this manuscript, nanofillers of graphene oxide (GO) and cellulose nanocrystal (CNC) with different weight ratios (G/C ratios), named GC 2:1, GC 4:1, GC 8:1, GC 16:1, and GC 32:1, were successfully prepared. Characterization methods such as Raman spectroscopy, X-ray photoelectron spectrometry (XPS), and thermogravimetric analysis (TGA) were performed. Additionally, the effects of these samples on the thermal stability, mechanical properties, and gas barrier properties of polysulfone (PSF) nanocomposites were investigated. A hydrophilic interaction took place between CNC and GO; as a consequence, CNCs were modified on the surface of GO, thus repairing the structural defects of GO. With the increase in G/C ratios, the repair effect of insufficient CNCs on the defects of GO decreased. The G/C ratio had a great influence on the improvement of mechanical properties, thermal stability, and gas barrier properties of nanocomposites. Compared with PSF/GC 2:1 and PSF/GC 32:1, the differences in the growth rates of tensile strength, elongation at break, and Young's modulus were 30.0%, 39.4%, and 15.9%, respectively; the difference in T was 7 °C; the difference in decline rate of O permeability was 40.0%.
在本论文中，成功制备了具有不同重量比（G/C比）的氧化石墨烯（GO）和纤维素纳米晶体（CNC）纳米填料，命名为GC 2:1、GC 4:1、GC 8:1、GC 16:1和GC 32:1。采用了拉曼光谱、X射线光电子能谱（XPS）和热重分析（TGA）等表征方法。此外，还研究了这些样品对聚砜（PSF）纳米复合材料的热稳定性、力学性能和气体阻隔性能的影响。CNC与GO之间发生了亲水相互作用；因此，CNC在GO表面被改性，从而修复了GO的结构缺陷。随着G/C比的增加，CNC不足对GO缺陷的修复效果降低。G/C比对纳米复合材料力学性能、热稳定性和气体阻隔性能的改善有很大影响。与PSF/GC 2:1和PSF/GC 32:1相比，拉伸强度、断裂伸长率和杨氏模量的增长率差异分别为30.0%、39.4%和15.9%；T的差异为7℃；氧气渗透率下降率的差异为40.0%。
