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Hydrolytic Degradation of Polysiloxanic Coatings on Glass Fibers

机译:玻璃纤维上聚硅氧烷涂层的水解降解

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摘要

Aqueous solutions of three silanes: 3-aminopropyltriethoxysilane (APES), 3-aminopropylmethyldiethoxysilane (APDES), and 3-aminopropyldimethylethoxysilane (APMES), were used to cover glass fibers. The pyrenesulfonyl chloride fluorescent moiety (PSC) was chemically attached to the silanized substrate via the sulfonamide formation when the sulfonyl group of moiety PSC reacts with the amino residues of the coatings. It was studied the silane layer hydrolytic degradation phenomenon (pH valence 7) was studied as a function of: i) temperature, and ii) coating layer type. A hydrolysis reaction mechanism of the poly-siloxane bonded onto the glass fibers has been proposed and, the enthalpy change of the process was obtained (3.5 kcal/ mol). In addition, it was observed that the greater the silane functionality the faster the hydrolytic degradation.
机译:三种硅烷的水溶液:3-氨基丙基三乙氧基硅烷(APES),3-氨基丙基甲基二乙氧基硅烷(APDES)和3-氨基丙基二甲基乙氧基硅烷(APMES)用于覆盖玻璃纤维。当部分PSC的磺酰基与涂层的氨基残基反应时,via磺酰氯荧光部分(PSC)通过磺酰胺形成化学连接到硅烷化的底物上。研究了硅烷层的水解降解现象(pH价7),其作用是:i)温度和ii)涂层类型。已经提出了键合到玻璃纤维上的聚硅氧烷的水解反应机理,并且获得了该过程的焓变化(3.5kcal / mol)。另外,观察到硅烷官能度越大,水解降解越快。

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