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采用熔融聚合法制备一系列聚对苯二甲酸丁二醇酯(PBT)/聚四亚甲基醚二醇(PTMG)聚醚酯热塑性弹性体,用NMR,FTIR,SEM,DSC,DMA,TGA及力学性能测试等方法表征了材料的结构与性能特征。在固定软段不变的条件下,研究了1,4-丁二醇(BDO)与对苯二甲酸二甲酯(DMT)的摩尔比变化对材料力学性能的影响。结果表明:随着BDO:DMT摩尔比的增加,聚酯硬段PBT的形成更完善,微相分离程度的提高促使层状有规结晶体及相界面形貌更明显、结晶度、储能模量及tanδ峰值的升高和力学性能的提高;当BDO:DMT摩尔比超过1.6:1时残存低分子BDO在相界面区和PBT层状结晶体周围的结晶使相界面区易发生脱粘或滑移,严重阻碍微相分离过程,使结晶度、储能模量及tanδ峰值降低,进而使力学性能下降。
A series of polybutylene terephthalate (PBT) / polytetramethylene ether glycol (PTMG) polyetherester thermoplastic elastomers were prepared by melt polymerization method and characterized by NMR, FTIR, SEM, DSC, DMA, TGA And mechanical properties testing methods to characterize the structure and performance characteristics of the material. The influence of the molar ratio of 1, 4-butanediol (BDO) to dimethyl terephthalate (DMT) on the mechanical properties of the material was studied under the condition of constant soft segment. The results show that with the increase of molar ratio of BDO: DMT, the formation of PBT in polyester hard segment is more perfect. The increase of the degree of micro-phase separation promotes the morphology of layered structured crystals and phase interface. The crystallinity, storage modulus And the increase of tanδ peak and the improvement of mechanical properties. When the mole ratio of BDO: DMT is over 1.6: 1, the crystallization of residual low molecular BDO in the phase interface zone and the PBT lamellae crystallizes to debonding or slipping , Seriously hinder the micro-phase separation process, so that the crystallinity, storage modulus and tanδ peak decreased, thereby reducing the mechanical properties.