Effect of hard segment on structure and properties of thermoplastic polyurethane elastomer

The series of polyurethane elastomers were synthesized from polyol PEA which was synthesized in our lab, MDI and different chain extenders EG/BDO/HG, using prepolymer method. The effects of different hard segment on the properties of the elastomer were studied:The hardness and mechanical property were analyzed;The crystallization property were studied by means of rotary rheometer. The results showed that, under the same hard segment content, the BDO-TPU had the best crystallization and tensile strength; the HG-TPU had the best elongation at break. In the BDOTPU system, with the increase of the hard segment content, the hardness and tensile strength increased, the elongation at break descended; both the onset temperature of crystallization and the crystallinity of TPE increased gradually.