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Mechanically improved sol-gel derived methacrylate-siloxane hybrid materials with urethane linkage

  • Original Paper: Characterization methods of sol–gel and hybrid materials
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Abstract

Ultraviolet (UV)-curable and highly condensed (>86%) methacrylate phenyl oligo-siloxane (MPO) was synthesized by non-hydrolytic sol–gel condensation reaction between methacrylate and phenyl silane precursor. The MPO resin was then cured by an UV-initiated free-radical polymerization to fabricate a transparent (>90% at 550 nm) methacrylate–siloxane hybrid material (methacrylate hybrimer). An urethane butanediol dimethacrylate (UBDM) monomer was synthesized as a cross-linker into the methacrylate hybrimer networks without micro-phase separation. The UBDM increased methacrylate conversion and mechanical properties due to the hydrogen bonding of the urethane linkage. The hardness, modulus, and strength were improved by UBDM insertion, the flexibility was even increased with 140% elongation, compared to neat MH. In addition, a storage modulus related to the thermo-mechanical properties was also enhanced by a denser cross-linkage with the urethane linkage.

Highlights

  • UV-curable methacrylate phenyl oligo-siloxane and methacryalte hybrimer can be simply fabricated by non-hydrolytic sol-gel reaction and free-radical polymerization.

  • Urethane butandiol dimethacrylate (UBDM) can be synthesized by a simple reaction and the UBDM can be chemically connected with methacrylate hybrimer without micro-phase separation.

  • Incorporation of the urethane linkage considerably enhances methacrylate conversion, mechanical and thermo-mechanical properties of methacrylate polymer, compared to other cross-linkers

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Acknowledgements

This work was supported by the Wearable Platform Materials Technology Center (WMC) supported by a National Research Foundation of Korea (NRF) Grant funded by the Korean Government (MSIP) (NRF-2016R1A5A1009926). This work was also supported by a grant from the Korea Evaluation Institute of Industrial Technology (Project number: 10051337).

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Authors and Affiliations

  1. Department of Materials Science and Engineering, Wearable Platform Materials Technology Center, Korea Advanced Institute of Science and Technology (KAIST), 291 Daehak-ro, Yuseong-gu, Daejeon, 34141, Republic of Korea

    Yun Hyeok Kim, Gwang-Mun Choi, Yong Ho Kim & Byeong-Soo Bae

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  1. Yun Hyeok Kim
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  2. Gwang-Mun Choi
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  3. Yong Ho Kim
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  4. Byeong-Soo Bae
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Correspondence to Byeong-Soo Bae.

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Kim, Y.H., Choi, GM., Kim, Y.H. et al. Mechanically improved sol-gel derived methacrylate-siloxane hybrid materials with urethane linkage. J Sol-Gel Sci Technol 89, 111–119 (2019). https://doi.org/10.1007/s10971-018-4803-y

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  • DOI: https://doi.org/10.1007/s10971-018-4803-y

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