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- W2012103078 abstract "Polycondensates of trialkoxysilanes of the type (Alk O)3SiR, in which the R group ends with an amine (APS), an epoxide (GPS) or an alkyl group (PS), have been prepared by hydrolytic crosslinking in order to obtain solids simulating an important interfacial layer in amine-crosslinked epoxy/glass-fibre composites. Analytical studies have revealed a high conversion degree of crosslinking in the three samples. They have been submitted to wet ageing under various conditions (temperature from 0 to 100 °C, relative humidity from 0 to 100%), and their composition and structural changes have been monitored by gravimetry. Hydrophilicity has been found to be sharply related to the polarity of the R group: APS > GPS ⪢ PS. Operating at ambient temperature or lower in an atmosphere of relative humidity, the critical physical sorption step can be decoupled from further hydrolysis, which allows us to estimate the water solubility and diffusivity in these materials. It can be concluded from these values that they cannot act as barriers protecting the fibre surface from water. APS and GPS materials are reactive towards water. Their hydrolysis is relatively fast in the conditions under study. The reaction is, however, equilibrated. A first kinetic model is proposed and the consequences for composite wet ageing are discussed." @default.
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- W2012103078 date "1997-01-01" @default.
- W2012103078 modified "2023-10-14" @default.
- W2012103078 title "Hydrolytic degradation of model networks simulating the interfacial layers in silanecoupled epoxy/glass composites" @default.
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- W2012103078 doi "https://doi.org/10.1016/s0266-3538(97)00038-9" @default.
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