Abstract: A series polyurethane elastomers was obtained through curing a prepolymer prepared from 1,5naphthalene diisocyanate (NDI) and polytetramethyleneetherglycol(PTMG), with trihydroxy polyether polyols(330N) as a crosslinking agent and a 1,4butanediol(BDO) as a chain extender. The effect of the crosslinking agent and chain extender on the properties of polyurethane elastomer based on NDI(NDIPUE) was discussed. With increasing contents of 330N, the glass transition temperature for soft segment of NDIPUE increased, the storage modulus decreased between 0 ℃ and 150 ℃, tensile strength and elongation at break of the NDIPUE increased firstly and then decreased; and its hardness went down also.

Key words: polyurethane elastomer, 1, 5naphthalene diisocyanate, trihydroxy polyether polyols, thermal property, mechanical property