基于奇数碳软链段PBT基弹力丝的制备及结构性能

Preparation and structural properties of PBT-based elastic filaments based on odd carbon soft segment

通过分子结构和聚合工艺设计合成了基于奇数碳软链段(聚三亚甲基醚二醇,PO3G)的聚对苯二甲酸丁二醇酯(PBT)基弹性体(PBT-PO3G),并分别以PO3G质量分数为20%和30%的PBT-PO3G为原料,采用熔融纺丝法制备弹力丝。通过与偶数碳软链段(聚四氢呋喃醚二醇,PTMG)质量分数为30%的PBT基弹性体(PBT-PTMG)及其弹力丝进行对比,探究奇数碳软链段结构对弹性体和弹力丝热力学性能的影响规律。结果显示,PBT-PO3G弹性体和弹力丝的回弹性优于PBT-PTMG,这是因为奇数碳软链段不易结晶。当牵伸倍数为2.5时,PO3G质量分数为30%的PBT-PO3G弹力丝的断裂强度为1.25cN/dtex,在定伸长10%条件下循环拉伸10次,回复率达93%。研究结果可为聚醚酯在弹性纤维领域的应用提供借鉴。

The PBT-poly(trimethylene glycol)(PO3G)-based elastomer was synthesized through meticulous design of molecular structure and polymerization processes.Subsequently,PBT-PO3G elastic filaments were fabricated via a melt spinning process,utilizing PO3G elastomer with a mass fraction of 20% and 30% as raw materials.Comparative analysis with PBTPTMG elastomer and elastic filaments incorporating poly(tetrahydrofuran)(PTMG)with a mass fraction of 30% was conducted to investigate the influence of the odd carbon soft chain segments structure on the thermodynamic properties of PBT-based elastomers and elastic filaments.Results indicate that the soft phase comprising odd carbon chains exhibits limited crystallization,contributing to enhanced resilience in PBT-based elastomer and elastic filaments.Notably,under a drafting factor of 2.5,the PBT-PO3G elastic filaments with PO3G mass fraction of 30% displays a strength of 1.25 cN/dtex and a 93% recovery rate after 10 cycles of cyclic drawing at a fixed elongation of 10%.The results provide reference for the application of poly(ether ester)in the field of elastic fiber.