High-Performance Poly(ethylene oxide)/Molybdenum Disulfide Nanocomposite Films: Reinforcement of Properties Based on the Gradient Interface Effect

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• 作者：Xiaming Feng ; Weiyi Xing ; Hongyu Yang ; Bihe Yuan ; Lei Song ; Yuan Hu ; Kim Meow Liew
• 刊名：ACS Applied Materials & Interfaces
• 出版年：2015
• 出版时间：June 24, 2015
• 年：2015
• 卷：7
• 期：24
• 页码：13164-13173
• 全文大小：715K
• ISSN：1944-8252

文摘

Herein, the molybdenum disulfide (MoS₂) was simultaneously exfoliated and noncovalently functionalized by ultrasonication in a Pluronic 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鈥檚 modulus, 72.7% increase in stress-at-failure, and 62.1 掳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.