Zhang Tongtong, Wang Shuo, Qiu Runkai, Yang Xiaolong, Zhu Fangming
GDHPPC Lab, School of Chemistry, Sun Yat-Sen University Guangzhou 510275 China.
South China Advanced Institute for Soft Matter Science and Technology, School of Emergent Soft Matter, South China University of Technology Guangzhou 510640 China.
RSC Adv. 2024 Aug 16;14(35):25793-25801. doi: 10.1039/d4ra04190a. eCollection 2024 Aug 12.
MXenes as an emerging class of 2D materials have great potential in fabricating functional polymer nanocomposites. In this study, TiCT MXene as a representative MXene filler was employed to prepare sPS nanocomposites. The abundant surface groups (mainly -OH) on MXene allowed facile modification, and thus MXene nanosheets bearing -CH groups were prepared using dodecyl triethoxysiloxane (DCTES) as a modifier. Grafting -CH long alkyl chains onto the surface of MXene strongly affected its affinity towards hydrophobic solvent and the sPS matrix. The rheological threshold concentration ( = 0.033 vol%) and exponent ( = 1.51) and the conductivity threshold concentration ( = 0.259 vol%) and exponent ( = 2.92) were determined by applying percolation scaling laws. The influences of DCTES-modified MXene on the polymorphism, mechanical, thermal and flammability properties of nanocomposites were studied. The obtained nanocomposites displayed not only enhanced mechanical properties, but also improved thermal stability and flame retardancy to some extent. Moreover, the higher the loading level of DCTES-modified MXene, the better was the improved effect.
MXenes作为一类新兴的二维材料，在制备功能性聚合物纳米复合材料方面具有巨大潜力。在本研究中，采用TiCT MXene作为代表性的MXene填料来制备sPS纳米复合材料。MXene上丰富的表面基团（主要是-OH）使得其易于改性，因此使用十二烷基三乙氧基硅氧烷（DCTES）作为改性剂制备了带有-CH基团的MXene纳米片。在MXene表面接枝-CH长烷基链强烈影响了其对疏水溶剂和sPS基体的亲和力。通过应用逾渗标度律确定了流变阈值浓度（ = 0.033体积%）和指数（ = 1.51）以及电导率阈值浓度（ = 0.259体积%）和指数（ = 2.92）。研究了DCTES改性的MXene对纳米复合材料的多晶型、力学、热和燃烧性能的影响。所获得的纳米复合材料不仅表现出增强的力学性能，而且在一定程度上提高了热稳定性和阻燃性。此外，DCTES改性的MXene的负载量越高，则改善效果越好。
