Thermodynamic analysis of the reaction-induced phase separation of solutions of random copolymers of methyl methacrylate and N, N-dimethylacrylamide in the precursors of a polythiourethane network
- Soulé, Ezequiel Rodolfo
- Jaffrennou, B.
- Méchin, F.
- Pascault, J. P.
- Borrajo Fernandez, Julio
- Williams, Roberto Juan Jose
DOIAbstract
Poly(methyl methacrylate) and random copolymers of methyl methacrylate (MMA) and N,N-dimethylacrylamide (DMA) containing 7.5, 15, or 20 wt % DMA were dissolved in a stoichiometric mixture of m-xylylene diisocyanate and 4-mercaptomethyl-3,6-dithia-1,8-octanedithiol, precursors of a polythiourethane network. Phase separation, which took place during polymerizations at 60, 90, and 120 °C, exhibited a lower critical solution temperature behavior. The cloud-point conversions, which were determined by the iodometric titration of free thiol groups of samples chilled in ice at the cloud point, increased with the weight fraction of DMA in the random copolymer. This could be used to control the cloud-point conversion and determine the characteristic ...
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