Preparation and structural properties of PBT-based elastic filaments based on odd carbon soft segment
The PBT-poly(trimethylenc 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 PBT-PTMG 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 segment's 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.
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