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UV‐activated hydrosilylation of (Me‐Cp)Pt(Me) 3 : Enhanced photocatalytic activity, polymerization kinetics, and photolithography
Author(s) -
Xi Lu,
Liu Zhu,
Su Jiahui,
Bei Yiling,
Xiang Hongping,
Liu Xiaoxuan
Publication year - 2019
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.48251
Subject(s) - hydrosilylation , photopolymer , platinum , catalysis , materials science , kinetics , polymer chemistry , chloroplatinic acid , polymerization , silicone , photochemistry , photocatalysis , silicone resin , chemistry , polymer , organic chemistry , nanotechnology , composite material , coating , physics , quantum mechanics
Hydrosilylation is commonly known as a thermally induced addition reaction between unsaturated bonds and SiH bonds to synthesize or crosslink organosilanes and organosilicones, while it has emerged that it can also be activated under the coaction of UV irradiation and specific platinum catalyst. For higher photopolymerization conversion, excessive platinum catalyst is always required; however, this inevitably causes the significant increase of production cost and decrease of operation time. In this study, traces of trimethyl(methylcyclopentadienyl) platinum (IV) (Me‐Cp)Pt(Me) 3 catalysts is combined with different photosensitizers (PSs) to efficiently promote the UV‐activated hydrosilylation. Naphthalene is found to be the most applicable PS, because it improves the photopolymerization conversion from about 70 to 100% for the crosslinking of silicone rubbers. This UV‐activated hydrosilylation is more likely to follow the first‐order reaction kinetics, and its activation energy is 30.9 kJ mol −1 . The mechanical properties and thermostability of UV‐crosslinked silicone rubbers are also enhanced with the incorporation of naphthalene. Moreover, this UV‐activated hydrosilylation of silicone rubbers reveals a potential role to prepare complicated geometry shapes by photolithography. © 2019 Wiley Periodicals, Inc. J. Appl. Polym. Sci. 2019 , 136 , 48251.