In case of CBZ formulations, initially a slight reduction in solubility (≈ 10-15 %) was observed in all the four triblock copolymers from day 0 to day 1 (24 h) (Figure ). The A-pBuOx-A and A-pBuOzi-A showed relatively stable formulations until day 30 and gradual minor decrease in solubility was observed, i.e. 10 to 7.2 g/L and 5.3 to 3.9 g/L, respectively at 10 g/L CBZ feed.