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Reactivity of silanol group on siloxane oligomers for designing molecular structure and surface wettability

  • Original Paper: Sol–gel, hybrids and solution chemistries
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Abstract

Molecular structures of siloxane materials should be highly controlled for achieving advanced functionalities. However, it is still difficult to precisely control the structure of siloxane materials by the sol–gel processing. In the present study, we focused on the silanol groups in the intermediate oligomers and resultant siloxane materials as a key structural unit for controlling the molecular structure. Thermal stability and chemical reactivity of silanol groups were found to be highly dependent on the steric effects of the surrounding side chains and siloxane skeletons. The present work suggests that controlling the steric effects around silanol groups in the intermediate oligomers allows modulating the crosslink density of siloxane skeletons. The selective molecular modification tunes the structure and chemical properties of the resultant siloxane materials.

Highlights

  • Hydroxyl groups in oraganically modified siloxane oligomers exhibit a diffrent reactivity depending on the local environments.

  • Molecular structures of siloxane materials should be highly controlled for achieving advanced functionalities.

  • The selective molecular modification tunes the structure and chemical properties of the resultant siloxane materials.

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Authors and Affiliations

  1. Department of Materials Science, Graduate School of Engineering, Osaka Prefecture University, Sakai, Osaka, 599-8531, Japan

    Daisuke Kino, Kenji Okada, Yasuaki Tokudome & Masahide Takahashi

  2. LMNT Laboratorio di Scienza dei Materiali e Nanotecnologie, Dipartimento di Chimica e Farmacia – CR- INSTM, Università di Sassari, Via Vienna, 2, 07100, Sassari (SS), Italy

    Luca Malfatti & Plinio Innocenzi

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  1. Daisuke Kino
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  2. Kenji Okada
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  3. Yasuaki Tokudome
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  5. Luca Malfatti
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  6. Plinio Innocenzi
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Correspondence to Masahide Takahashi.

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Kino, D., Okada, K., Tokudome, Y. et al. Reactivity of silanol group on siloxane oligomers for designing molecular structure and surface wettability. J Sol-Gel Sci Technol 97, 734–742 (2021). https://doi.org/10.1007/s10971-020-05448-z

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  • DOI: https://doi.org/10.1007/s10971-020-05448-z

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