Synthesis and Hydrolysis of Poly(norbornene)/Poly(acrylic acid) Graft Copolymers Synthesized via a Combination of Atom-Transfer Radical Polymerization and Ring-Opening Metathesis Polymerization

摘要

Graft copolymers offer the unique possibility of tailoring material properties through selection of the polymer backbone and the side chains.Through changes of these segments,properties such as morphology,order-disorder transitions,and phase behavior can be modified.Additionally,through the use of graft or hyper-branched polymers,polymer solution properties such as critical overlap concentration,persistence length,diffusion behavior,and viscosity can be controlled.Examples in the literature of graft structures having a pronounced effect on material properties are numerous.Staikos et al.showed that grafting of amphiphilic poly-(N-isopropylacrylamide) to a semirigid carboxymethyl-cellulose backbone gave thermoresponsive polymers with an increase in viscosity of over four orders of magnitude from 25 to 60degC.