Thermosensitive polymer structures based on segmented copolymer networks

Segmented polymer networks with LCST-behavior have been prepared by free ra dical initiated copolymerization of alpha,omega -bis-methacrylate terminate d poly(methyl vinyl ether) (PMVE) with 2-hydroxy ethyl methacrylate (HEMA) or butyl acrylate (BA). The PMVE bis-macromonomers have been obtained via a semi-continuous process by end-capping the living cationic polymerization of methyl vinyl ether (MVE) with HEMA. The phase separation temperature can be varied by changing the PMVE/comonomer ratio. Incorporation of PMVE-graf ts in the hydrogels increases the rate of deswelling and improves the mecha nical properties. The application of the segmented networks for thermo-cont rollable solid phase extraction has been demonstrated by their thermosensit ive adsorption behavior of toluene from a water solution.