Synthesis and Solution Properties of Loose Polymer Brushes Having Polyimide Backbone and Methylmethacrylate Side Chains

Abstract

Summary: Graft‐copolymers with polyimide backbone and PMMA side chains are synthesized by ATRP of methylmethacrylate on the polyimide macroinitiator. The obtained copolymers, macroinitiator, and cleaved side chains are investigated by 1H NMR, SEC, static and dynamic light scattering, sedimentation, and viscosimetry in solutions. The synthesized copolymer is relatively loose polymer brushes: the average distance between grafted PMMA chains is ∼11 nm (4 repeat units of the backbone). The hydrodynamic and conformational characteristics of graft‐copolymers change on passage from ethylacetate to chloroform due to difference in the thermodynamic quality of the solvents with respect to the copolymer components. The backbone is characterized more extended conformation than individual polyimide macromolecule.

Methods of controlled radical polymerization for the synthesis of polymer brushes

“…In selective solvents of various thermo dynamic qualities for the backbone and side chains, such polyimide brushes assume conformations of a more or less elongated ellipsoid of revolution [142,143] or form a nearly spherical core-shell structure with the collapsed backbone (core) surrounded by side chains protruding into the solution [143], as con firmed by the computer simulation method [144].…”

Achievements in polycondensation and condensation polymers

“…PI was used as a macroinitiator in the controlled radical polymerization of vinyl monomers to give rise to new polymer brushes [271][272][273][274][275].…”

Synthesis and characterization of amphiphilic branched silica derivatives associated with oligomeric medium

“…Amphiphilic macromolecular brushes are copolymers with narrowly dispersed side chains graed to the main chain. [3][4][5][6][7][8][9][10][11][12][13] The properties of polymer brushes can be changed in a wide range compared with similar properties of linear polymers. The main design elements here are the length regulation of the main and side chains, the density of graing, the chemical nature and architecture of the side chains.…”