TGIC separation of PS-b-P2VP diblock and P2VP-b-PS-b-P2VP triblock copolymers according to chemical composition

The separation condition of SP diblock and PSP triblock copolymers having various compositions using an amine-bonded silica gel column and a mixture of THF/ACN with LiCl salt as stationary phase and mobile phase, respectively, was reported. Both diblock and triblock copolymers can be separated clearly in terms of chemical composition by temperature gradient interaction chromatography (TGIC). The TGIC method utilizes manily the interaction between the polymer chains and the stationary phase, where the interaction strength is controlled by varying the coloumn temperature. The absolute weight-average molecular weights of SP diblock and PSP triblock copolymers were measured by a multiangle laser light scattering of the type DAWN EOS of Wyatt Technology.