Another Synthesis Route to New Materials: Hydrogenation of Heteroaromatic Polymers

摘要

Heterogeneous catalytic hydrogenation of Poly(2-vinylpyridine) (P2VP) and Poly(4-vinylpyridine) (P4VP) was successfully achieved using various group VIII metals supported on carbon at relatively mild conditions. There was no sign of chain degradation upon hydrogenation reaction. The saturated polymers P2VPip and P4VPip show high solubility to water as well as some polar organic solvents. Incorporation of amine group to polymer chain makes the further functionalization easier. The glass transition temperatures of P2VPip and P4VPip are found to be higher than the original polymers. The selective hydrogenation of PS-P2VP was successfully accomplished using heterogeneous catalyst. Catalyst poisoning by P2VP block brings to the selectivity of hydrogenation on the P2VP block over the PS block. The hydrogenated block copolymers have non-ionic and amphiphilic nature. They showed sphere like morphology with aggregates of P2VPip block dispersed in PS domain.