Mechanical Properties of GAP-TPE with Different Diol Chain Extenders

摘要

Energetic thermoplastic urethane elastomer (ETPE) based on prepolymerized glycidyl azide polymer (GAP), 4’4 -Diphenylmethane diisocyanate (MDI) and chain estenders such as Ethylene glycol (EDO), 1,4-butanediol(BDO) and 1,6-Hexanediol (HDO) were synthesized by melt-prepolymerization. The mechanical properties such as tensile strength, elongation at break and Young’s modulus of the ETPE were studied by the tensile set. Glass transition temperatures, Storage modulus and Tand were carried out using Dynamic mechanical therm al analysis (DMTA). The character of ETPE also were analyzed by FTIR. The effect of the compositional variation on the above-mentioned properties was examined. The results demonstrate that BDO as the chain extender shows better mechanical properties, when the hard segment content is 35%, tensile strength, elongation at break and young’s modulus were 13.4 MPa, 362% and 17.2 MPa, respectively. And the tensile strength, young’s modulus and storage modulus increase with hard segment content increases.