For LAP, the A-pPentOx-A triblock also exhibited the similar stability pattern as for CTZ i.e. rapid reduction in solubility was observed at day 1 and until day 30, an 80% decrease in LAP solubility was observed (Figure ). In contrast, for A-pBuOx-A, A-pBuOzi-A and A-pPrOzi-A triblock copolymers, a minor loss in solubility (< 10%) was observed until day 30.