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Temperature and pH sensitive graft copolymers [Pluronic--poly(NIPAAm--MMA), Polymer A] and [Pluronic--poly( NIPAAm--MAA), Polymer C] were synthesized by macro radical graft polymerization with -isopropylacrylamide (NIPAAM)/-diethylaminoethylmethacrylate (DEAEMA) and -isopropylacrylamide (NIPAAm)/methacrylic acid (MAA) based on Pluronic, respectively. The chemical structure and molecular weight of the graft copolymers was characterized by NMR and gel permeation chromatography. The aqueous solution properties of graft copolymers were measured using a UV-visible spectrophotometer, contact angle and dynamic light scattering equipment with different temperature and pH conditions. The obtained graft copolymers showed a very sensitive phase transition in response to temperature and pH in aqueous media which suggested that the amine group of DEAEMA segment and carboxylic group of MAA had a great influence on the lower critical solution temperatures (LCST) in Polymer A and C, respectively. The graft copolymers can be utilized for drug delivery system and molecular switching applications where responses to temperature and pH changes are relevant.

Synthesis and Characterization of Temperature and pH Sensitive Graft Copolymers Based on Pluronic