Modeling isothermal free-radical frontal polymerization with gel effect using free volume theory, with and without inhibition |
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Authors: | D E Devadoss V A Volpert |
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Institution: | (1) Department of Engineering Sciences and Applied Mathematics, Northwestern University, 2145 Sheridan Rd., Evanston, IL 60208-3125, USA |
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Abstract: | Frontal Polymerization is a process that converts monomers into polymers by means of a propagating spatially localized reaction
front. Such fronts exist with free-radical polymerization, where in the simplest case, a mixture of monomers and initiator
is placed into a test tube and upon initiation of the reaction at one end of the tube, a self-sustained wave develops and
propagates through the tube. Isothermal Frontal Polymerization (IFP), often referred to as interfacial gel polymerization,
occurs due to the coupling of mass diffusion of the species and the gel effect. Utilizing the free volume theory of Vrentas
and Duda for describing the self-diffusive behavior of the gel effect, we mathematically model and study this IFP process.
We determine, both numerically and analytically, characteristics of the process including the propagation velocity of the
reaction zone, the structure of the wave, and the distance traveled by the front before it breaks down due to reactions ahead
of the front |
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Keywords: | polymerization mathematical modeling isothermal frontal gel effect |
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