Schmack G, Jehnichen D, Vogel R, Tändler B, Beyreuther R, Jacobsen S, Fritz H G
Institut fuer Polymer Forschung (IPF), Dresden e.V., Hohe Strasse 6, 01069 Dresden, Germany.
J Biotechnol. 2001 Mar 30;86(2):151-60. doi: 10.1016/s0168-1656(00)00410-7.
Poly(lactide) (PLA) was spun both in a high speed spinning process with take-up velocities of 1000-5000 m min(-1) and in a spin drawing process at draw ratios of 4-6. The effect of the melt spinning conditions on the development of the structural hierarchy in the fibres and the relations to the textile physical properties were investigated. The PLA fibres were characterised with regard to the degree of crystallinity by DSC and WAXS, the orientation by WAXS and birefringence, and the stress-strain behaviour. The maximum physical break stress and the E-modulus observed in the spin drawn fibres were about 490 MPa and 6.3 GPa, respectively, at an elongation at break of 30%. The PLA was a copolymer of L-lactide (92 wt.%) and meso-lactide (8 wt.%) and was generated by reactive extrusion polymerisation. The PLA virgin pellets were analysed regarding their degradation during the spinning processes. Their thermal and rheological properties were determined by DSC and dynamic rheological measurements, respectively, to derive suitable parameters for the melt spinning processes.
聚乳酸（PLA）在卷取速度为1000 - 5000 m min⁻¹的高速纺丝过程以及拉伸比为4 - 6的纺丝拉伸过程中进行纺丝。研究了熔体纺丝条件对纤维结构层次发展的影响以及与纺织物理性能的关系。通过差示扫描量热法（DSC）和广角X射线散射（WAXS）对PLA纤维的结晶度进行了表征，通过WAXS和双折射对取向进行了表征，并研究了应力 - 应变行为。在纺丝拉伸纤维中观察到的最大物理断裂应力和弹性模量分别约为490 MPa和6.3 GPa，断裂伸长率为30%。该PLA是L - 丙交酯（92 wt.%）和内消旋丙交酯（8 wt.%）的共聚物，通过反应挤出聚合制备。对PLA原始粒料在纺丝过程中的降解情况进行了分析。分别通过DSC和动态流变测量确定了它们的热性能和流变性能，以得出熔体纺丝过程的合适参数。
