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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/108861

    Title: Preparation of HMDS-modified silica/polyacrylate hydrophobic hard coatings on PMMA substrates
    Authors: Chang, Chao-ching;Wu, Yu-ting;Cheng, Liao-ping
    Keywords: Silica nanoparticle;Hard coating;Transparent;Hydrophobicity;Nanocomposite coating
    Date: 2016-11
    Issue Date: 2016-12-17 02:11:01 (UTC+8)
    Publisher: Springer US
    Abstract: Colloidal silica nanoparticles synthesized from tetraethoxysiliane via a sol–gel process were surface modified by 3-(trimethoxysilyl)propyl methacrylate (MSMA) and 1,1,1,3,3,3-hexamethyldisilazane (HMDS). MSMA acted both as a C=C provider and a coupling agent, whereas HMDS was used to prevent particle aggregation and engender hydrophobicity.
    The modified silica particles (HMSiO2) were UV-cured together with the crosslinking agent, dipentaerythritol
    hexa-acrylate (DPHA) to form coatings on poly(methyl methacrylate) (PMMA) substrates. Dynamic light scattering of the synthesized sols indicated that the average size of HMSiO2 was ca. 10 nm, consistent with that obtained from TEM imaging. FTIR spectroscopic analyses demonstrated chemical attachment of HMDS to the silica particles. The cured
    coatings were characterized in terms of water contact
    angle, light transmittance, hardness, abrasion resistance, and surface morphology. It was found that
    hydrophobicity of the coatings increased while light
    transmittance and hardness decreased with increasing
    HMDS content. DPHA played the role of providing
    mechanical strength and adherence; however, the coatings became lightly hazy when the weight ratio of
    DPHA/silica fell in the range 0.3–0.7. In the optimal case, a hard coating (4H) with water contact angle of
    108 and transmittance of 100% (vs PMMA) had been obtained at the DPHA content of 10 wt%.
    Relation: Journal of Coatings Technology and Research 13(6), p.999-1007
    DOI: 10.1007/s11998-016-9820-6
    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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