화학공학소재연구정보센터
Journal of Industrial and Engineering Chemistry, Vol.56, 443-449, December, 2017
Determination of diffusion coefficient and partition coefficient of photoinitiator 2-hydroxy-2-methylpropiophenone in nanoporous polydimethylsiloxane network and aqueous poly(ethylene glycol) diacrylate solution
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We determine diffusion and partition coefficients of 2-hydroxy-2-methylpropiophenone, a widely used photo-initiator, in nanoporous polydimethylsiloxane network and poly(ethylene glycol) diacrylate solution as model precursor solution. We spectroscopically measure average concentration of 2-hydroxy- 2-methylpropiophenone in each media, which is compared to the one estimated from one-dimensional diffusion models to obtain diffusion coefficient. Partition coefficient is obtained by measuring saturated concentration of 2-hydroxy-2-methylpropiophenone in each media. Our results enables predicting concentration of 2-hydroxy-2-methylpropiophenone as it diffuses from precursor solution to crosslinked PDMS, which typically occurs when hydrogel is formed inside microfluidic device via photo- polymerization to create nano-structured or micro-structured hydrogel including microfluidic valves.
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