Molecular and Structure–Properties Comparison of an Anionically Synthesized Diblock Copolymer of the PS-b-PI Sequence and Its Hydrogenated or Sulfonated Derivativesстатья
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Аннотация:An approach to obtaining various nanostructures utilizing a well-studied polystyrene-bpoly(isoprene) or PS-b-PI diblock copolymer system through chemical modification reactions is reported.The complete hydrogenation and partial sulfonation to the susceptible carbon double bondsof the PI segment led to the preparation of [polystyrene-b-poly(ethylene-alt-propylene)] as well as[polystyrene-b-poly(sulfonated isoprene-co-isoprene)], respectively. The hydrogenation of the polyisopreneblock results in enhanced segmental immiscibility, whereas the relative sulfonation inducesan amphiphilic character in the final modified material. The successful synthesis of the pristinediblock copolymer through anionic polymerization and the relative chemical modification reactionswere verified using several molecular and structural characterization techniques. The thinfilm structure–properties relationship was investigated using atomic force microscopy under variousconditions such as different solvents and annealing temperatures. Small-angle X-ray scatteringwas employed to identify the different observed nanostructures and their evolution upon thermalannealing.