扩链剂与交联剂对NDI型聚氨酯弹性体性能的影响

Effect of Chain Extender and Crosslinking Agent on the Properties of Polyurethane Elastomer Based on NDI

用1,5-萘二异氰酸酯(NDI)和聚四氢呋喃醚二醇(PTMG)为原料合成了聚氨酯预聚体,以三羟基聚醚多元醇(330N)作为交联剂,1,4-丁二醇(BDO)作为扩链剂制备了NDI型聚氨酯弹性体,讨论了交联剂与扩链剂的不同羟基摩尔比对NDI型聚氨酯弹性体性能的影响。结果表明,随着三羟基聚醚多元醇含量的增加,NDI型聚氨酯弹性体软段玻璃化转变温度有所提高;三羟基聚醚多元醇的加入虽然使得聚氨酯弹性体的滞后损失峰值增加,但对常用温度范围的滞后损失影响不大,0～150℃温度范围内的储能模量降低;聚氨酯弹性体的拉伸强度与断裂伸长率随着三羟基聚醚多元醇含量的增加,呈先增加后下降的趋势变化,硬度则呈下降趋势。

A series polyurethane elastomers was obtained through curing a prepolymer prepared from 1, 5-naphthalene diisoeyanate （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 °C and 150 °C, tensile strength and elongation at break of the NDI-PUE increased firstly and then decreased; and its hardness went down also.