Bicomponent fibers consisting of polylactide (PLA) as the sheath and poly(butylene terephthalate) (PBT) as the core were produced by high-speed spinning to obtain materials suitable for medical clothing. The higher-order structure of the PLA fiber component appeared to exhibit simple, alternately stacked, uniaxially oriented amorphous and crystalline regions. Therefore, fairly large tanδ peaks were observed for single-component PLA fibers, even when the orientation-induced crystallization was achieved by high-speed spinning. By conjugating PLA with PBT, although limited mutual interference with the crystallization of each component occurred, both the PLA (Mw = 170,000, L-lactide content = 98.7%) and PBT (intrinsic viscosity = 0.835-0.865 dL/g) could crystallize on a high-speed spinning line, and the proposed formation of a shish-kebab-like structure in the PBT component enhanced the thermal stability of the bicomponent fibers, particularly resulting in shrink-proof properties. The bicomponent fibers developed herein could be deeply dyed at 98 °C, with results comparable to those of industrial polyester, and peeling of the PLA skin layer was rarely observed, even when the dyed fibers were flattened by a rubbing force.

通过高速纺丝生产由聚丙交酯（PLA）作为外皮和聚对苯二甲酸丁二醇酯（PBT）作为内芯的双组分纤维，以获得适用于医用服装的材料。PLA纤维组分的高阶结构似乎表现出简单的，交替堆叠的，单轴取向的无定形和结晶区域。因此，即使当通过高速纺丝实现取向诱导的结晶时，对于单组分PLA纤维也观察到相当大的tanδ峰。通过将PLA与PBT结合，尽管发生了对每种组分结晶的有限相互干扰，但PLA（Mw = 170,000，L-丙交酯含量= 98.7％）和PBT（固有粘度= 0.835-0.865 dL / g）均可在高速纺线 提出的在PBT组分中形成类似烤肉串的结构增强了双组分纤维的热稳定性，特别是产生了防收缩性能。本文开发的双组分纤维可以在98°C下进行深度染色，其结果与工业聚酯相当，并且即使通过摩擦力使染色的纤维变平，也很少观察到PLA表皮层的剥离。