X. M. Feng, W. Y. Xing, H. Y. Yang, B. H. Yuan, L. Song, Y. Hu and K. M. Liew (2015) High-Performance Poly(ethylene oxide)/Molybdenum Disulfide Nanocomposite Films: Reinforcement of Properties Based on the Gradient Interface Effect. Journal/Acs Applied Materials & Interfaces 7 13164-13173. [In English]
Web link: http://dx.doi.org/10.1021/acsami.5b02312
Keywords: poly(ethylene oxide); MoS2 nanosheets; noncovalent functionalization; mechanical properties; thermal stability; gradient interface; EXFOLIATED MOS2; MOLYBDENUM-DISULFIDE; AQUEOUS DISPERSIONS; THERMAL-PROPERTIES; GRAPHENE; NANOSHEETS; PEO; COMPOSITES; CHITOSAN
Abstract: Herein, the molybdenum disulfide (MoS2) was simultaneously exfoliated and non-covalently functionalized by ultrasonication in a Plutonic aqueous solution and then was used, to prepare the poly(ethylene oxide) (PEO) based nanocomposite films. The homogeneous dispersion of MoS2 and strong nanosheets/matrix interfacial adhesion were confirmed by representative electron microscopes. The considerable 'barrier' action of the effective MoS2 nanosheets obviously restricted the ordering of crystal lamellae and the Motion of polymer chains and then resulted in the formation of the devastated spherocrystal structure and morphological, alterations in the nanocomposites, which were confirmed by polarized optical microscopy and the high value of the glass transition temperature: Importantly, MoS2 nanosheets hold great promise in reinforcing the thermal stability and mechanical property of polymer by increasing the effective volume of MoS2 nanosheets. A substantial reinforcement effect of PEO/MoS2 composite-films was achieved: even at a relatively low loading level (0.9 wt %), 88.1% increase in Young's modulus, 72.7% increase in stress-at-failure, and 62.1 degrees C increment of the temperature corresponding to half weight loss were obtained. These significant reinforcements can be attributed to the,gradient interface region, which could effectively transfer the stress from the weak polymer chains to the robust nanosheets, thus endowing the PEO/MoS2, composite films with excellent properties.