【摘要】 以羟基特戊酸新戊二醇单酯(HPHP)与丁二酸(SA)缩聚反应合成聚酯二醇,再与2,4-甲苯二异氰酸酯(TDI-100)和3,3’-二氯-4,4’-二氨基二苯甲烷(MOCA)反应制备聚氨酯(PU)阻尼材料,研究了聚酯二醇分子量对PU阻尼性能及力学性能的影响,并用红外光谱(FT-IR)、核磁共振(1H-NMR)以及扫描探针显微镜(SPM)对其结构进行了表征。结果表明,随聚酯二醇分子量增加,PU阻尼材料的损耗因子最大值(tanδmax)显著提高,Tg先降低后升高;PU阻尼材料的硬度、拉伸强度和撕裂(直角)强度明显下降,而扯断伸长率显著提高。更多还原

【Abstract】 Polyester type polyurethane(PU) were prepared by the reaction of 2,4-tolulene diisocyanate(TDI-100),3,3′-dichloro-4,4′-diaminodiphenyl methane(MOCA) with polyester glycol,which was synthesized using hydroxypivalyl hydroxypivalate(HPHP) and succinic acid(SA).The damping and mechanical properties of PUs with different molecular weights polyester glycols were studied.The structures of damping PU were characterized by FT-IR,1H-NMR and scanning probe microscope(SPM).The experimental results indicate that the maximum loss factor (tan δmax) of PU is improved significantly with increasing of the molecular weight of polyester glycols,while glass transition temperature(Tg) increases at first and then decreases.Meanwhile,Shore A hardness,tensile strength and tear strength of PU decrease obviously and the elongation at break greatly increases.更多还原