关键字：MOLYBDENUM-DISULFIDE; GRAPHENE ANALOG; PERFORMANCE; NANOSHEETS; HYBRID; REINFORCEMENT; FILMS

摘要：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 (T-g). 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.

卷号：44

期号：12

是否译文：否