Abstract

Various types of conjugate fibers comprised of polylactide (PLA) and polyethylene terephthalate (PET), with their blend in the sheath, PET as the core, were produced by high-speed melt-spinning. Due to the higher glass transition temperature of PET, the orientation-induced crystallization only occurred in the PET core. The crystalline and continuous PET core of the conjugate fibers effectively suppressed the shrinkage during dyeing, even in a pressurized water bath at 130 °C comparable to the commercial level, to less than 5% while achieving a color strength higher than 15. Post-annealing in the restrained mode could effectively cause the fine PET fibrils embedded in the sheath to rise out from the surface of the fibers during dyeing by the sliding friction force between the fibers. The PET fibrils rising out from the sheath were strong enough and showed an entangling behavior which would be useful to fabricate non-woven fabrics. The amorphous PLA domains exposed on the fiber surface showed the bacteriostatic activity valuable for the inhibition of the formation of biofilms.

摘要

通过高速熔体纺丝生产了各种类型的复合纤维，其中包括聚丙交酯（PLA）和聚对苯二甲酸乙二醇酯（PET），它们在外皮中的掺混物以PET为芯。由于PET的玻璃化转变温度较高，定向诱导的结晶仅发生在PET芯中。复合纤维的结晶和连续PET芯即使在130℃（与商业水平相当）的加压水浴中，也能有效地将染色过程中的收缩率抑制至5％以下，同时实现高于15的色强度。在约束模式下，通过纤维之间的滑动摩擦力，可以有效地使包埋在鞘中的细PET原纤维从纤维表面上升。从皮层中伸出的PET原纤维足够坚固，并表现出缠结特性，这对制造非织造织物很有用。暴露在纤维表面上的无定形PLA域显示出抑菌活性，对于抑制生物膜的形成非常有价值。