Abstract
We have measured volume change of microcapsules composed of dioctylphthalate inner core and polyethyleneglycol-grafted poly(ureaurethane) (PUU) wall membrane induced by solvent exchange in dispersing medium from water to ethanol. The time course of the process consisted of a lag phase, a swelling phase and a shrinking phase. The temperature dependence of the duration of the lag phase t1 was roughly described by the Arrhenius plot, and the slope for the logarithm of the time constant vs. the reciprocal of the absolute temperature was coincident with that of the viscosity coefficient of ethanol, suggesting that the permeation rate of ethanol into the core mainly determines the duration of the lag phase.
