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Preparation of hydrophobic nanosilica-filled polyacrylate hard coatings on plastic substrates

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Abstract

Colloidal silica nanoparticles synthesized from tetraethoxysilane via a sol–gel process were surface-modified first by 3-(trimethoxysilyl)propyl methacrylate, and then by trimethylethoxysilane (TMES). The former agent acts both as a coupling agent and as a C=C provider, whereas the latter agent is used to prevent particle aggregation and to increase hydrophobicity of the coating. The modified silica particles were UV-cured together with the monomer, 2-hydroxyethyl methacrylate (2-HEMA), and the crosslinking agent, dipentaerythritol hexaacrylate (DPHA), to form highly transparent hard coatings on plastic (PMMA and PET) substrates. Both differential scanning calorimetric and thermal gravimetric analyses of the hybrid materials indicated enhanced thermal stability with respect to the neat HEMA–DPHA copolymer. Furthermore, due to the incorporation of TMES, hydrophobicity of the hybrid coating increased considerably with increasing modified silica content. In the extreme case, an antiabrasive hard coating (7H on PMMA) with a water contact angle of 99° was obtained at the silica content of 15 wt%.

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Authors and Affiliations

  1. Department of Chemical and Materials Engineering, Tamkang University, Taipei, 25137, Taiwan

    Chao-Ching Chang, Tai-Yueh Oyang, Yu-Chen Chen, Feng-His Hwang & Liao-Ping Cheng

  2. Energy and Opto-Electronic Materials Research Center, Tamkang University, Taipei, 25137, Taiwan

    Chao-Ching Chang & Liao-Ping Cheng

Authors
  1. Chao-Ching Chang
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  2. Tai-Yueh Oyang
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  3. Yu-Chen Chen
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  4. Feng-His Hwang
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  5. Liao-Ping Cheng
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Correspondence to Liao-Ping Cheng.

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Chang, CC., Oyang, TY., Chen, YC. et al. Preparation of hydrophobic nanosilica-filled polyacrylate hard coatings on plastic substrates. J Coat Technol Res 11, 381–386 (2014). https://doi.org/10.1007/s11998-013-9540-0

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  • DOI: https://doi.org/10.1007/s11998-013-9540-0

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