Synthesis of Silphenylene-Containing Siloxane Resins Exhibiting Strong Hydrophobicity and High Water Vapor Barriers

The novel phenylenedisilane, 1,4-bis(dimethoxyphenylsilyl)benzene (BDMPD), was successfully synthesized via the reaction between trimethoxyphenylsilane (TMPS) and a Grignard reagent originating from 1,4-dibromobenzene. In comparison to common Grignard reactions, this process was a facile one-pot met...

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Bibliographic Details
Published in:Coatings (Basel) 2019-08, Vol.9 (8), p.481
Main Authors: Chen, Xunjun, Yi, Minghao, Wu, Shufang, Tan, Lewen, Xu, Yixin, Guan, Zhixing, Ge, Jianfang, Yin, Guoqiang
Format: Article
Language:English
Subjects:
Benzene
Chemical analysis
Chemical synthesis
Chromatography
Contact angle
Copolymerization
Curing
Dielectric properties
Ethanol
Fourier transforms
Grignard reactions
Hydrophobicity
Infrared analysis
Infrared spectroscopy
Nanoparticles
Nitrogen
NMR spectroscopy
Permeability
Polymerization
Polymers
Polysiloxanes
Protective coatings
Reagents
Refractivity
Resins
Siloxanes
Vacuum distillation
Viscosity
Water vapor
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Summary:The novel phenylenedisilane, 1,4-bis(dimethoxyphenylsilyl)benzene (BDMPD), was successfully synthesized via the reaction between trimethoxyphenylsilane (TMPS) and a Grignard reagent originating from 1,4-dibromobenzene. In comparison to common Grignard reactions, this process was a facile one-pot method. 1H NMR spectroscopy, FT-IR measurements, and elemental analysis confirmed the predicted structure of BDMPD. In addition, vinyl-terminated polysiloxanes containing silphenylene units (VPSSP), which were hydrolytically copolymerized from BDMPD, TMPS, and divinyltetramethyldisiloxane, exhibited excellent thermal stabilities (T10%: 502 °C, Rw%: 76.86 beyond 700 °C) and suitable refractive indices (1.542). Furthermore, water contact angle and water vapor permeability tests confirmed that the fully cured siloxane resins containing VPSSP-based silphenylene units exhibited strong hydrophobicity (water contact angle: 119°) and superior water vapor barrier properties, thereby indicating their potential to serve as strong waterproof coatings for moisture-proof applications or as adhesives for use in immersed equipment.
ISSN:2079-6412
2079-6412
DOI:10.3390/coatings9080481