Abstract The aggregation of two-dimensional (2D) layered nanofillers restricts their use as reinforcements in polymers. Herein, the bisphenol E cyanate ester resin (CE) nanocomposites based on surface functionalization of molybdenum disulfide (MoS2) nanosheets with polysulfone (PSF) are prepared. In the structures, PSF segment were sandwiched between adjacent MoS2 nanoplatelets, which restrained the restacking of the MoS2 nanoplatelets. The compatibility between PSF modified MoS2 and CE is improved as compared with MoS2 and CE. The tensile strength and apparent shear strength of the nanocomposite show that modified MoS2 nanosheets are very effective at increasing the adhesive and mechanical properties of cyanate esters at very low quality fractions. Pulling out effects, crack bridging, crack deflection, and crack pinning are the main strengthening mechanisms of mechanical properties. The glass transition temperature increases from 245 °C for the unfilled cyanate ester to 265 °C at 0.15 % MoS2 loading. The results are consistent with the nanoconfinement effect including a nanoscale interfacial layer that can support the effective reinforcements of functionalized MoS2 nanoplatelets over pure MoS2. The excellent properties of MoS2/PSF/CE nanocomposites indicate that the approach in this study is effective to prepare high-performance molybdenum disulfide/cyanate ester polymer composites.

中文翻译：

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聚砜表面功能化二硫化钼纳米片对氰酸酯纳米复合材料的影响

摘要二维 (2D) 层状纳米填料的聚集限制了它们在聚合物中作为增强剂的用途。在此，制备了基于二硫化钼 (MoS2) 纳米片与聚砜 (PSF) 表面功能化的双酚 E 氰酸酯树脂 (CE) 纳米复合材料。在结构中，PSF 片段夹在相邻的 MoS2 纳米片之间，这抑制了 MoS2 纳米片的重新堆积。与 MoS2 和 CE 相比，PSF 改性的 MoS2 和 CE 之间的兼容性得到改善。纳米复合材料的拉伸强度和表观剪切强度表明，改性的 MoS2 纳米片在非常低的质量分数下非常有效地提高了氰酸酯的粘合性和机械性能。拉出效应、裂纹桥接、裂纹偏转、和裂纹钉扎是力学性能的主要强化机制。玻璃化转变温度从未填充的氰酸酯的 245 °C 增加到 0.15 % MoS2 负载下的 265 °C。结果与纳米限制效应一致，包括纳米级界面层，可以支持功能化 MoS2 纳米片在纯 MoS2 上的有效增强。MoS2/PSF/CE 纳米复合材料的优异性能表明本研究中的方法可有效制备高性能二硫化钼/氰酸酯聚合物复合材料。结果与纳米限制效应一致，包括纳米级界面层，可以支持功能化 MoS2 纳米片在纯 MoS2 上的有效增强。MoS2/PSF/CE 纳米复合材料的优异性能表明本研究中的方法可有效制备高性能二硫化钼/氰酸酯聚合物复合材料。结果与纳米限制效应一致，包括纳米级界面层，可以支持功能化 MoS2 纳米片在纯 MoS2 上的有效增强。MoS2/PSF/CE 纳米复合材料的优异性能表明本研究中的方法可有效制备高性能二硫化钼/氰酸酯聚合物复合材料。