Abstract A facile strategy was applied to transfer chemically exfoliated molybdenum disulphide (MoS2) nanosheets from aqueous medium to organic solvents. The MoS2 nanosheets were then modified by trisilanol-phenyl-POSS (T7POSS) which was confirmed by Fourier transform infrared (FT-IR), X-ray photoelectron spectroscopy (XPS) and Powder X-Ray Diffraction (PXRD). The modified MoS2 nanosheets were then incorporated into poly (methyl methacrylate) (PMMA) via a simple solution blending method. The Scanning Electron Microscope (SEM) and Transmission electron microscope (TEM) were employed to demonstrate the well-dispersion of nanosheets in polymeric matrix. Compared to neat PMMA, the decomposition temperatures (Td) and the half weight decomposition temperatures (Thalf) of POSS-MoS2/PMMA nanocomposites at nanosheets concentration of 0.2 wt% were dramatically increased by 35.2 °C and 35.3 °C, respectively. Meanwhile, according to the measurements of Dynamic Mechanical Analysis (DMA), the storage modulus at 30 °C is significantly improved by 5.2 times and the glass transition temperature (Tg) is also enhanced by 6.2 °C. Remarkably, POSS-MoS2/PMMA nanocomposites possess low optical limiting differential transmittance Tc (0.5%), low nonlinear optical absorption onset threshold FON (0.02 J⋅cm−2), low optical limiting threshold FOL (0.4 J⋅cm−2) and high nonlinear coefficient β (297⋅cm GW−1), highlighting their vast potential in the development of solid-state optical limiting materials.

中文翻译：

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轻松制造具有增强的热、机械和光学限制性能的 POSS 改性 MoS 2 /PMMA 纳米复合材料

摘要 采用一种简便的策略将化学剥离的二硫化钼 (MoS2) 纳米片从水性介质转移到有机溶剂中。然后通过傅里叶变换红外（FT-IR）、X射线光电子能谱（XPS）和粉末X射线衍射（PXRD）证实了三硅烷醇-苯基-POSS（T7POSS）修饰的MoS2纳米片。然后通过简单的溶液混合方法将改性的二硫化钼纳米片掺入聚（甲基丙烯酸甲酯）（PMMA）中。使用扫描电子显微镜 (SEM) 和透射电子显微镜 (TEM) 来证明纳米片在聚合物基质中的良好分散。与纯 PMMA 相比，POSS-MoS2/PMMA 纳米复合材料在纳米片浓度为 0 时的分解温度 (Td) 和半重分解温度 (Thalf)。2 wt% 分别显着增加了 35.2 °C 和 35.3 °C。同时，根据动态力学分析（DMA）的测量，30°C下的储能模量显着提高了5.2倍，玻璃化转变温度（Tg）也提高了6.2°C。值得注意的是，POSS-MoS2/PMMA 纳米复合材料具有低光学极限差分透射率 Tc (0.5%)、低非线性光学吸收起始阈值 FON (0.02 J⋅cm-2)、低光学极限阈值 FOL (0.4 J⋅cm-2) 和高非线性系数 β (297⋅cm GW-1)，突出了它们在开发固态光学限幅材料方面的巨大潜力。2 倍，玻璃化转变温度 (Tg) 也提高了 6.2 °C。值得注意的是，POSS-MoS2/PMMA 纳米复合材料具有低光学极限差分透射率 Tc (0.5%)、低非线性光学吸收起始阈值 FON (0.02 J⋅cm-2)、低光学极限阈值 FOL (0.4 J⋅cm-2) 和高非线性系数 β (297⋅cm GW-1)，突出了它们在开发固态光学限幅材料方面的巨大潜力。2 倍，玻璃化转变温度 (Tg) 也提高了 6.2 °C。值得注意的是，POSS-MoS2/PMMA 纳米复合材料具有低光学极限差分透射率 Tc (0.5%)、低非线性光学吸收起始阈值 FON (0.02 J⋅cm-2)、低光学极限阈值 FOL (0.4 J⋅cm-2) 和高非线性系数 β (297⋅cm GW-1)，突出了它们在开发固态光学限幅材料方面的巨大潜力。