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Covalent functionalization of activated MoS2 via using alkyl sulfide and their utilization in polymeric composites with mechanical and thermal property enhancements
Polymer Composites ( IF 4.8 ) Pub Date : 2023-10-03 , DOI: 10.1002/pc.27746 Yunxia Li 1, 2, 3, 4, 5 , Yiming Song 1 , Dongchun Yang 1 , Sheng Tian 1 , Qin Deng 2 , Xuegang Chen 1 , Zhaobo Wang 1 , Xin Wang 1 , Haiqing Hu 1 , Yilong Wang 1, 5 , Yong Tao 1 , Jian Zhao 1, 2, 3, 4, 5
Polymer Composites ( IF 4.8 ) Pub Date : 2023-10-03 , DOI: 10.1002/pc.27746 Yunxia Li 1, 2, 3, 4, 5 , Yiming Song 1 , Dongchun Yang 1 , Sheng Tian 1 , Qin Deng 2 , Xuegang Chen 1 , Zhaobo Wang 1 , Xin Wang 1 , Haiqing Hu 1 , Yilong Wang 1, 5 , Yong Tao 1 , Jian Zhao 1, 2, 3, 4, 5
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Recently developed covalent functionalization of chemically exfoliated MoS2 (typically in alkyl lithium) allows the formation of chalcogenide-carbon bonds by reacting with organohalides and aryl diazonium salts. We herein develop a novel method for the covalent functionalization of MoS2 to yield dodecylated MoS2 via reductive activation in a strongly reducing sodium-naphthalene solution and using alkyl sulfide as an electrophile. Dodecylated MoS2/polystyrene (PS) composites fabricated by solution casting method. Dodecyl chains are grafted successfully onto MoS2 nanosheets, which gives rise to the exfoliation level of few-layer thickness and matched compatibility with the host polymeric matrix. The inclusion of dodecylated MoS2 at a concentration of 1.0 wt% yields a substantial improvement in both Young's modulus and tensile strength, with a 106.7% increase and a 67% enhancement, respectively, as compared to the performance of pure PS. The enhanced mechanical characteristics can be credited to the uniform dispersion of dodecylated MoS2 within the PS matrix and enhanced interfacial interaction between the PS material and the filler. The composites demonstrate a significant increase in their glass transition temperature (Tg). Notably, the dodecylated MoS2/PS (1.0 wt%) composite exhibits a 59.8% elevation in storage modulus when compared to pure PS. The coke yield of dodecylated MoS2/PS (1.0 wt%) reaches 2.7%, much larger than the value (only 0.2%) for pure PS. The novel functionalization might expedite the applications of molybdenum disulfide in diverse fields.
中文翻译：
通过使用烷基硫醚共价功能化活化的MoS2及其在机械和热性能增强的聚合物复合材料中的应用
最近开发的化学剥离MoS 2（通常在烷基锂中）的共价官能化允许通过与有机卤化物和芳基重氮盐反应形成硫属化物-碳键。我们在此开发了一种新方法，用于通过在强还原性钠-萘溶液中的还原活化并使用烷基硫作为亲电子试剂，对MoS 2进行共价官能化以产生十二烷基化MoS 2 。采用溶液浇铸法制备十二烷基化MoS 2 /聚苯乙烯(PS)复合材料。十二烷基链成功接枝到MoS 2纳米片上，从而产生了几层厚度的剥离水平以及与主体聚合物基质的相匹配的相容性。与纯PS相比，以1.0wt%的浓度加入十二烷基化MoS 2可以显着改善杨氏模量和拉伸强度，分别提高106.7%和67%。增强的机械特性可归因于十二烷基化MoS 2在PS基质中的均匀分散以及PS材料和填料之间增强的界面相互作用。该复合材料的玻璃化转变温度 ( T g )显着提高。值得注意的是，与纯 PS 相比，十二烷基化 MoS 2 /PS (1.0 wt%) 复合材料的储能模量提高了 59.8%。十二烷基化MoS 2 /PS（1.0 wt%）的焦炭产率达到2.7%，远大于纯PS的值（仅0.2%）。这种新颖的功能化可能会加速二硫化钼在不同领域的应用。
更新日期：2023-10-03
中文翻译：
通过使用烷基硫醚共价功能化活化的MoS2及其在机械和热性能增强的聚合物复合材料中的应用
最近开发的化学剥离MoS 2（通常在烷基锂中）的共价官能化允许通过与有机卤化物和芳基重氮盐反应形成硫属化物-碳键。我们在此开发了一种新方法，用于通过在强还原性钠-萘溶液中的还原活化并使用烷基硫作为亲电子试剂，对MoS 2进行共价官能化以产生十二烷基化MoS 2 。采用溶液浇铸法制备十二烷基化MoS 2 /聚苯乙烯(PS)复合材料。十二烷基链成功接枝到MoS 2纳米片上，从而产生了几层厚度的剥离水平以及与主体聚合物基质的相匹配的相容性。与纯PS相比，以1.0wt%的浓度加入十二烷基化MoS 2可以显着改善杨氏模量和拉伸强度，分别提高106.7%和67%。增强的机械特性可归因于十二烷基化MoS 2在PS基质中的均匀分散以及PS材料和填料之间增强的界面相互作用。该复合材料的玻璃化转变温度 ( T g )显着提高。值得注意的是，与纯 PS 相比，十二烷基化 MoS 2 /PS (1.0 wt%) 复合材料的储能模量提高了 59.8%。十二烷基化MoS 2 /PS（1.0 wt%）的焦炭产率达到2.7%，远大于纯PS的值（仅0.2%）。这种新颖的功能化可能会加速二硫化钼在不同领域的应用。
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