Various types of bicomponent fibers composed of polylactide (PLA) and poly(butylene terephthalate) (PBT) with different molecular weights, arranging the polymers separately in the skin or core, were produced by high-speed melt-spinning. The bicomponent spinning, arranging the PLA with high molecular weight (melt flow rate =1.9 g/10 min, L-lactide content = 98.7%) in the skin and the PBT with low molecular weight (IV = 0.835–0.865 dL/g) in the core, resulted in orientation-induced crystallization in the PLA component at the spinning speed of 2 km/min. This crystallization effect was ascribed to a chain-extending treatment applied to the original PLA (MFR = 4.0 g/10 min) to increase its molecular weight. By the treatment the PLA could crystallize when spun even at 1 km/min in its single-component spinning. On the other hand, the bicomponent spinning system interfered with the orientation-induced crystallization of PBT in the core. As a result, the critical spinning speed needed to generate the orientation-induced crystallization in the core PBT was elevated to 4 km/min. The inferior tensile behavior of the bicomponent fibers, as compared to the single-component PLA or PBT fibers, suggested poor compatibility between PLA and PBT. Transesterification reactions rarely occurred at the interface of the two polymers. The bicomponent fibers prepared from high molecular weight PLA and low molecular weight PBT, however, showed sufficient antibacterial activity and physical properties to be suitable for designing medical clothing materials.

通过高速熔体纺丝，生产了由不同分子量的聚丙交酯（PLA）和聚对苯二甲酸丁二酯（PBT）组成的各种类型的双组分纤维，这些聚合物分别布置在表皮或芯中。双组分纺丝，将高分子量的PLA（熔体流动速率= 1.9 g / 10 min，L-丙交酯含量= 98.7％）布置在皮肤中，将低分子量的PBT布置（IV = 0.835–0.865 dL / g）在纺丝芯中，以2 km / min的纺丝速度在PLA组分中导致取向诱导的结晶。这种结晶作用归因于对原始PLA进行的扩链处理（MFR = 4.0 g / 10 min），以增加其分子量。通过这种处理，即使在单组分纺丝中以1 km / min的速度旋转时，PLA也会结晶。另一方面，双组分纺丝系统干扰了芯中PBT的取向诱导结晶。结果，在芯PBT中产生取向诱导的结晶所需的临界纺丝速度提高到4km / min。与单组分PLA或PBT纤维相比，双组分纤维的拉伸性能较差，表明PLA和PBT之间的相容性较差。酯交换反应很少在两种聚合物的界面处发生。然而，由高分子量PLA和低分子量PBT制备的双组分纤维显示出足够的抗菌活性和物理性质，适合于设计医用服装材料。在纤芯PBT中产生取向诱导结晶所需的临界纺丝速度提高到4 km / min。与单组分PLA或PBT纤维相比，双组分纤维的拉伸性能较差，表明PLA和PBT之间的相容性较差。酯交换反应很少在两种聚合物的界面处发生。然而，由高分子量PLA和低分子量PBT制备的双组分纤维显示出足够的抗菌活性和物理性质，适合于设计医用服装材料。在纤芯PBT中产生取向诱导结晶所需的临界纺丝速度提高到4 km / min。与单组分PLA或PBT纤维相比，双组分纤维的拉伸性能较差，表明PLA和PBT之间的相容性较差。酯交换反应很少在两种聚合物的界面处发生。然而，由高分子量PLA和低分子量PBT制备的双组分纤维显示出足够的抗菌活性和物理性质，适合于设计医用服装材料。酯交换反应很少在两种聚合物的界面处发生。然而，由高分子量PLA和低分子量PBT制备的双组分纤维显示出足够的抗菌活性和物理性质，适合于设计医用服装材料。酯交换反应很少在两种聚合物的界面处发生。然而，由高分子量PLA和低分子量PBT制备的双组分纤维显示出足够的抗菌活性和物理性质，适合于设计医用服装材料。