In the case of CXB formulation, all the four triblock copolymer (at all the tested CXB ratios) exhibited very good stability and only minor loss in solubility was observed until day 30 (Figure ). In the case of A-pBuOx-A, A-pPentOx-A and A-pPrOzi-A (at 6 g/L CXB feed) the solubility decreased from 4.8 to 4.3, 3.7 to 2.5, 3.5 to 3.2 g/L, respectively from day 0 to 30 while in the case of A-pBuOzi-A formulation (at 4 g/L CXB feed), the solubility decreased from 4.0 to 2.7 g/L. In the case of CTZ formulations, the A-pBuOx-A triblock copolymer presented as highly stable formulation at all the tested ratios and a minor loss in solubility was observed (< 5%) although the solubility never exceeded ≈ 2 g/L at any of the employed CTZ feed (Figure ).