Study on water resistance of amino acid functionalized molybdenum disulfide/epoxy resin composite materials
Epoxy resin has made significant progress in various high-tech fields due to its excellent physical and chemical properties.In recent years,with the increasing demand for materials science in certain extreme environments,the need to improve the water resistance of epoxy resin has become increasingly urgent.In this paper,glycine(Gly)modified molybdenum disulfide(MoS2)nanosheets were first prepared,and then they were used to modify epoxy resin,and Gly-MoS2/epoxy resin composite materials were obtained.The structure,microstructure,mechanical properties,thermomechanical properties,and water absorption rate were characterized.The research results showed that,(1)The target products were successfully prepared,and MoS2 nanosheets that had been exfoliated and modified by glycine were more evenly dispersed in the resin matrix.While ensuring appropriate lateral dimensions,the thickness was thinner and the compatibility with the matrix resin was better.(2)With the increase of the addition amount of nanosheets,the shear strength,tensile strength,and impact strength of resin systems at room temperature and high temperature after boiling were all improved.This was because the modified nanosheets were uniformly dispersed in the matrix and formed a more stable sea-island structure with the epoxy group,thereby improving the water resistance of the material itself.(3)The thermomechanical performance tests showed that Gly-MoS2 nanosheets played an important role in enhancing the temperature resistance of materials after water boiling.The water absorption test showed that Gly-MoS2 greatly improved the water resistance of epoxy resin,and the water absorption rate decreased with the increase of Gly-MoS2 nanosheets.The water resistance of the 1.00％Gly-MoS2/epoxy resin system was the best,with a final water absorption rate of only 1.2％after boiling for 192 h.
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