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    Please use this identifier to cite or link to this item: http://tkuir.lib.tku.edu.tw:8080/dspace/handle/987654321/107055

    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: 2016-12
    Issue Date: 2016-08-15
    Publisher: Springer New York LLC
    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, pp.1–9
    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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