Abstract
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.
Highlights
IntroductionIn the past few decades, the use of polymers in packaging applications or as protective devices has increased considerably due to their low cost, low density, and interesting mechanical properties [1]
In the past few decades, the use of polymers in packaging applications or as protective devices has increased considerably due to their low cost, low density, and interesting mechanical properties [1].Since the transport of gases through food and pharmaceutical packaging [2], the encapsulation of solar cells [2], and the protective coating of water-soluble optical crystals [3,4] are often not desirable due to the potential formation of damaged or spoiled goods, the use of coatings that combine a water vapor barrier [5] with hydrophobicity [6] to repel water and inhibit the permeation of water vapor is of particular interest
This was likely due to the difficulty in accurately controlling the Grignard reaction during synthesis, and so small amounts of silicon monomers containing more than one phenylene unit were simultaneously formed
Summary
In the past few decades, the use of polymers in packaging applications or as protective devices has increased considerably due to their low cost, low density, and interesting mechanical properties [1]. Since the transport of gases through food and pharmaceutical packaging [2], the encapsulation of solar cells [2], and the protective coating of water-soluble optical crystals [3,4] are often not desirable due to the potential formation of damaged or spoiled goods, the use of coatings that combine a water vapor barrier [5] with hydrophobicity [6] to repel water and inhibit the permeation of water vapor is of particular interest Such materials must possess a high degree of light transmittance [7,8]. Vinyl-terminated polysiloxanes containing silphenylene units were synthesized based on the phenylenedisilane copolymer component, and the thermal stabilities and refractive indices of the resulting materials were examined, as were the hydrophobicity and water vapor barrier properties
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