Segmented polymer networks based on poly (N-isopropyl acrylamide) and poly (tetrahydrofuran) as polymer membranes with thermo-responsive permeability

摘要

Segmented polymer networks (SPNs) containing a polymer with a lower criticla solution temperature were prepared by free radical copolymerization of poly (tetrahydrofuranq) (PTHF) bis-macromonomers with N-isopropyl acrylamide (NIPAA).The PTHF bismacromonomers,which were prepared by living cationic polymerization of tetrahydrofuran,were providedw ith acrylate or acrylamide end-groups by end-capping the living polymers chains with acrylic acid and 3-acrylaminopropanoic acid,respectively.Differential Scanning Calorimetry (DSC) experiments shwoed clearly that,for the same fractions of both network components,the phase morphology of the SPNs was highlky influenced and adjustable by the nature of the end-groups of the bis-macromonomer as a result of their copolymerization behaviour with NIPAA.