聚酯型聚氨酯弹性体的合成及性能研究

Synthesis and Performance Research of Polyester Polyurethane Elastomers

以4,4'-二苯甲烷二异氰酸酯(MDI)、聚己二酸丁二醇酯二醇(PBA)、1,4-丁二醇(BDO)为原料,采用预聚法合成了MDI基聚酯型聚氨酯弹性体(TPU)。研究了硬段含量对TPU相关性能的影响。研究发现:随着硬段含量的提高,TPU的拉伸强度、软段相的玻璃化转变温度均呈现上升趋势,但TPU的断裂伸长率、初始热分解温度呈下降趋势。因此,为了获得优异的综合性能,TPU中硬段含量不宜过高。

4,4'-Phenyl methane diisocyanate (MDI), poly(1,4-butanediol hexandioic acid) ester (PBA) and 1,4- butanediol (BDO) were used as raw materials, and the pre-polymer method was adopted to syn-thesize MDI-based polyester polyurethane (TPU). The influences of the hard segment content on the relevant performances of TPU were investigated. The results showed that: with the increase of hard segment, the tensile strength of TPU and Tg of soft phase showed a rising trend. But the elongation at break and initial thermal decomposition temperature dropped dramatically. Therefore, in order to obtain excellent comprehensive performance, the hard segment content should not be too high.