Hydrodynamic and molecular study of poly{4-[4-(hexyloxy)phenyl] ethynylphenyl methacrylate} in dilute solutions and conformational peculiarities of brush-like macromolecules

摘要

Brush-like poly{4-[4-(hexyloxy)phenyl]ethynylphenyl methacrylate}s are synthesized using RAFT polymerization, fractionated and studied by molecular hydrodynamic methods. The values of the velocity sedimentation coefficient, the frictional ratio, and the intrinsic viscosity are obtained in toluene. The conformational and structural parameters of the studied polymer chains are estimated by the use of theories that describe the hydrodynamic behavior of the wormlike cylinders without intra-chain excluded volume effects and the hydrodynamic behavior of bending rods. The intrinsic viscosity data obtained for poly{4-[4-(hexyloxy)phenyl]ethynylphenyl methacrylate}s and for other brush-like macromolecules are discussed in terms of a doubly-normalized scaling plot.