Abstract
The synthesis of new stimulus-responsive block copolymer gelators using atom transfer radical polymerisation (ATRP) in either methanol or 2-propanol/water mixtures at 20 °C is described. Bifunctional and trifunctional initiators were used to prepare ABA triblock and I(BA) 3 three-arm star diblock copolymers, respectively, using a ‘one-pot’ ATRP protocol, in which the central block comprised poly(glycerol monomethacrylate) and the outer blocks comprised pH-responsive poly[2-(diethylamino)ethyl methacrylate] or poly[2-(diisopropylamino)ethyl methacrylate]. These copolymers dissolve molecularly in acidic solution but formed free-standing gels at around neutral pH on addition of base. Gel strength was judged by both tube inversion experiments and shear rheometry measurements and a comparison between the linear and star architectures was made.
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