Abstract
Creation of repeatable healing function is one of the most interesting topics in self-healing materials. As a solution of this problem, we aimed to develop a principle to realize repeatable healing using microcapsules with stress-activated channels. In this study, we evaluated the effect of pH of MC preparation environment on membrane thickness of microcapsules prepared by coacervation. Here, pH of MC preparation environment was set as of pH3.5, pH3.4, pH3.3 and pH4.5. Moreover, we observed repeatable leakage behavior of core material from microcapsules prepared by coacervation and removal of glass micro beads as secondary phase. The experiment was carried out at the acetic acid concentration of 40[wt%] and 60[wt%]. As results, the membrane thickness of microcapsules increased with increase of acetic acid concentration. In addition it was confirmed that microcapsules prepared using beads with diameter of 10 μm stope leakage of core material after unloading. These results indicate that the closing function actuated in case of channel diameter of 10 μm.
