NDI型聚氨酯弹性体宏观性能的研究

Study on Macro-properties of Polyurethane Elastomer Based on NDI

采用预聚物法合成了以聚四氢呋喃醚二醇(PTMG)、1,5-萘二异氰酸酯(NDI)、1,4-丁二醇(BDO)、三羟甲基丙烷(TMP)等为主要原料的双组分浇注型聚氨酯弹性体。通过差示扫描量热分析、动态力学性能分析和常规力学性能分析,对NDI型聚氨酯弹性体的性能进行了研究。结果表明,NDI型聚氨酯弹性体有良好的低温柔顺性,动态生热低、储能模量高、力学性能优异;随着预聚物中NCO基含量的增加,软段玻璃化转变温度依次降低,平台区储能模量依次上升,损耗因子逐渐降低,拉伸强度先增大后减小,硬度逐渐升高。

Casting two-component polyurethane elastomers were synthesized polytetramethylene ether glycols （PTMG）, 1,5-naphthalene diisocyanate （NDI）, 1,4-butanediol （BDO）, and trimethylolpropane （TMP） as the main precusors. The obtained polyurethane elastomers had superior mechanical properties, good flexibility at low temperature, low dynamic heat, and high storage modulus. With increasing NCO content, the platform modulus and hardness increased, the glass transition temperature of soft segments and the loss factor reduced, while tensile strength first increased and then decreased.