3 years ago

Effect of crosslinked polymer content on drying of binary polymer—solvent coatings

Effect of crosslinked polymer content on drying of binary polymer—solvent coatings
Coatings of poly(styrene) in p-xylene and ethyl benzene have been prepared using solvent casting method. Effect of initial coating thickness on the residual solvent, average concentration of polymer, average concentration of solvent, and change in coating thickness have been studied for poly(styrene) − p-xylene and poly(styrene) −ethyl benzene coatings. The drying of these coatings was externally controlled for sufficiently long time followed by a slow diffusion controlled mechanism. The time taken in the diffusion controlled regime was very much higher as compared to the externally controlled regime. Effect of crosslinked poly(styrene-co-divinylbenzene) content on drying behavior was studied in binary poly(styrene) – p-xylene and poly(styrene) – ethyl benzene systems. Crosslinked polymer content has increased the drying time in both the polymer – solvent systems. The residual solvent content was higher in coatings having crosslinked content as compared to linear polymer – solvent coatings in case of p-xylene system. However, the trend was reversed in case of ethylbenzene system.

Publisher URL: www.sciencedirect.com/science

DOI: S0300944017307221

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