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- W2092600996 abstract "We have studied the dynamic surface properties of four different primary amines in a low-molecular-weight epoxide resin by measuring dynamic spreading pressures. These spreading pressures directly manifest surface activity of the primary amines, which include three members of the dialkylaminopropylamine family (dimethyl, diethyl, and dibutyl), and the coupling agent γ-aminopropyltrimethoxysilane. Each of these systems shows a characteristic maximum in spreading pressure with time. Details of the transport processes (diffusion, chemical reaction, and adsorption) responsible for this time-dependence are illustrated in the context of a previously developed theory. The three dialkylaminopropylamines, for example, clearly show the effect of the reaction rate/diffusion rate ratio, or Damköhler number, on the dynamic spreading pressure. Likewise, by varying the bulk concentration of γ-aminopropyltrimethoxysilane, we have been able to demonstrate that saturation of the solution/vapor interface occurs for a bulk concentration of roughly 0.5 mass%. Further experiments using related silane compounds also suggest that the primary amine moiety is preferentially expelled from the solution phase, and is therefore responsible, in large part, for the observed surface activities." @default.
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- W2092600996 date "1984-06-01" @default.
- W2092600996 modified "2023-09-25" @default.
- W2092600996 title "Dynamic surface properties due to amine migration and chemical reaction in primary amine/epoxide systems" @default.
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- W2092600996 doi "https://doi.org/10.1016/0021-9797(84)90145-0" @default.
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