The RIM (reaction injection molded) curing stage for imperfectly mixed, mixing-activated polyurethanes can be simulated by means of an initial condition of alternating monomer striations. Both experimental work and computer simulations have been used to examine the effects of this imperfectly mixed condition on the RIM curing stage. The experimental work consists of adiabatic temperature rise measurements and interfacial polyurethane reactions, in order to assess the effects of processing conditions on both bulk and small scale phenomena. The computer simulation follows the diffusion and reaction of the species by means of a set of coupled one-dimensional partial differential equations across one striation. The results of this study indicate that a variety of phenomena result from the interfacial polymerization, such as: (1) small scale mixing due to interfacial instabilities and (2) morphological variations across the striations due to diffusion-reaction interactions.
|Original language||English (US)|
|Journal||Annual Meeting - American Institute of Chemical Engineers|
|State||Published - Dec 1 1984|
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