Ionic grafting

Abstract

Cationic polymerization of isobutene has been carried out in carbon disulfide solution in the presence of AlBr3 and chloromethylpolystyrene at −60°C. in order to obtain graft copolymers. The separation of the graft copolymers from the reaction mixtures in benzene solution was based on a standardized precipitation technique involving use successively of butanone and methanol as precipitating agents. By this method, fractions with an intermediate solubility have been isolated and purified twice. The differences of solubility of their products are discussed. Their isobutene content and intrinsic viscosities have been determined. The degree of grafting of these products is usually low (5–18%).

Gel permeation chromatograph interface to collect solvent‐free polymer fractions for composition drift analysis

“…The effect of changing HC/PES ratio on the computed CD pattern with ML = 34,000 for ES is shown in Figure 8. Given the scatter in the experimental CD the simulation result suggests that the block copolymer content lies somewhere between 20 and 60 mol %.…”