Molecular design of the polymer forming the complex with metal. Part IV. Complexation of pyridine-containing polyisoprene with zinc

摘要

Two types of polyisoprenes modified by N-pyrid-2-ylmethyl amide (MPY) group were synthesized. and their complcxation with ZnCl_2 and the thermal property of complexes were investigated. Although these polymers are viscous liquid, the complex i, solid at room temperature. MPY modified polyisoprene in which MPY connected a main chain without a ~pacer (MPYIP) shows the non-stoichiometric complexation, so that the melting temperature of the complex is low ( 105°C). On the other hand, MPY modified polyisoprene with a C5 spacer (MPYC5IP) shows the high melting temperature (143°C). It is surprising that the glass-transition temperatures of the complexes are almost as same as that of polyisoprene. These results Indicate that the presence of the spacer effectively enhances the aggregation of polymers. As a result, MPY is a novel functional structure, since MPY -ZnCl_2 complex functions as an excellent hard-segment in various flexible polymers.