Effect of Hard and Soft Segment on Structure-Property of Thermoplastic Polyurethane Elastomer

A series of polyurethane(PU) elastomers based on polybutylene adipate(PBA) as soft segment were synthesized by bulk polymerization and solution polymerization.Their morphologies,shape-memory effect,thermal stability and mechanical properties were analyzed by means of FT-IR spectra,AFM,TGA,tensile tests and hydrolysis stability testing.Polytetramethylene glycol(PTMG) was added into soft segment to get better performance of the specimens.PU shows different performances by chang-(ing) the mol ratio of MDI and BD(hard segment) and the quantity of polyether adding into the soft segment.Results show that better mechanical properties,water resistance and 75%-85% of shape recovery are obtained at 31%-35% of hard segment content and 4%-5% of PTMG content.