Synthesis and properties of elastomeric ionenes I. Polybutadiene ionenes
Abstract
Polybutadiene ionene (PBI) carrying quaternary ammonium ions in the main chain was synthesized from dimethylamino-terminated polybutadiene and 1,4-dibromobutane. Dimethylamino-terminated polybutadiene was prepared by the reaction of isocyanate-terminated polybutadiene with 2-dimethylaminoethanol. The swelling property and the mechanical properties of PBI were compared with those of polybutadiene urethane (PBU), which was prepared by the reaction of hydroxy-terminated polybutadiene with a diisocyanate. The following points were found: (1) PBI shows almost the same solubility parameter δp as that of PBU; (2) PBI attains a four time greater tensile strength at break than PBU at room temperature; (3) PBI shows a thermoplastic behavior.