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    Title: Synthesis of Modified Silica Spheres Used for the Preparation of Dual Ultraviolet- and Thermo-cured Epoxyacrylate/Silica Composites
    Authors: Yu-Chieh Su;Liao-Ping Cheng;Don, Trong-Ming
    Contributors: 淡江大學化學工程與材料工程學系
    Date: 2012-11
    Issue Date: 2013-01-17 09:10:34 (UTC+8)
    Publisher: Hoboken: John Wiley & Sons, Inc.
    Abstract: To investigate the interfacial effect on properties of epoxyacrylate–silica composites, submicron-sized silica spheres were synthesized by sol–gel reaction under a basic environment and their surfaces were endowed with vinyl functional groups by further modification with 3-methacryloxypropyl trimethoxy silane. The pure silica (PS) and the modified silica (MPS) spheres were characterized by Fourier transform infrared, 29Si- and 13C-nuclear magnetic resonance (NMR), scanning electron microscope (SEM), and particle size analyzer. The silica spheres were then added to the presynthesized difunctional epoxyacrylate resin with one vinyl group and one epoxide group at each end, in addition to the photo- and thermo-curing agents. After cure, thermal and mechanical
    properties of the obtained epoxyacrylate–silica composites were measured and compared. Tensile mechanical properties including initial modulus, ultimate tensile strength, and elongation at break, as well as the fracture energy of the epoxyacrylate–silica composite were all increased by increasing the content of silica spheres.
    Moreover, the composites filled with MPS had stronger interfacial strength between silica sphere and matrix than those with PS and thus exhibited an additional increase of tensile mechanical properties and fracture toughness. The increase of fracture toughness was owing to the crack deflection and particle–matrix debonding as evidenced by SEM pictures on the fracture surface.
    Relation: Polymer Engineering and Science 52(11), pp.2462–2472
    DOI: 10.1002/pen.2305
    Appears in Collections:[化學工程與材料工程學系暨研究所] 期刊論文

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