Control of thermal and mechanical properties by double-cyclopolymerization and copolymerization of trifunctional POSS with varying organic substituents

Author:

Nakano Taishi1,Imoto Hiroaki12,Naka Kensuke13

Affiliation:

1. Faculty of Molecular Chemistry and Engineering, Graduate School of Science and Technology, Kyoto Institute of Technology , Goshokaido-cho, Matsugasaki, Sakyo-ku , Kyoto, Kyoto 606-8585, Japan

2. FOREST, JST , Honcho 4-1-8, Kawaguchi , Saitama 332-0012, Japan

3. Materials Innovation Lab, Kyoto Institute of Technology , Goshokaido-cho, Matsugasaki, Sakyo-ku , Kyoto, Kyoto 606-8585, Japan

Abstract

Abstract Phenyl- and trifluoropropyl-substituted corner-opening type cage silsesquioxane (CO-POSS) monomers capped with methacrylethoxypropyldimethylsiloxy groups at the three silanol moieties were prepared by the hydrosilylation of trisdimethylsilyl-capped heptaphenyl- and heptatrifluoropropyl-substituted trisilanols with ethylene glycol monoallyl ether and subsequent reaction with methacryloyl chloride. Reversible addition-fragmentation chain transferpolymerization was performed on these monomers, and their structures and properties were compared to those of their previously-reported isobutyl-substituted counterparts. The polymer with a phenyl group exhibited enhanced thermal and mechanical properties, whereas the polymer with a trifluoropropyl group exhibited not only water repellency but also oil repellency. In addition, trifunctional CO-POSS monomers with different organic substituents could be used for double-cyclocopolymerization, and tuning of their properties was achieved. Furthermore, the trifunctional CO-POSS monomer could be used for double-cyclocopolymerization with methyl methacrylate without cross-linking.

Funder

Grant-in-Aid for Scientific Research

Ministry of Education, Culture, Sports, Science, and Technology, Government of Japan

Publisher

Oxford University Press (OUP)

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