Puchalski Michał, Kwolek Sylwia, Szparaga Grzegorz, Chrzanowski Michał, Krucińska Izabella
Department of Material and Commodity Sciences and Textile Metrology, Faculty of Material Technologies and Textile Design, Centre of Advanced Technologies of Human-Friendly Textiles "Pro Humano Tex", Lodz University of Technology, Zeromskiego 116, 90-924 Lodz, Poland.
Polymers (Basel). 2017 Jan 6;9(1):18. doi: 10.3390/polym9010018.
In this paper, the influence of the molecular structure of polylactide (PLA)-characterised by its molar mass and content of d-lactide isomer-on the molecular ordering and α'⁻α form transition during fibre manufacturing by the wet spinning method is described. Fibres were studied by wide-angle X-ray diffraction (WAXD) and differential scanning calorimetry (DSC). Additionally, the physical and mechanical properties of the fibres were determined. This study also examines the preliminary molecular ordering and crystallisation of PLA fibres at various draw ratios. The performed experiments clearly show the dependence of the molecular ordering of PLA on the molar mass and d-lactide content during the wet spinning process. The fibres manufactured from PLA with the lowest content of d-lactide and the lowest molar mass were characterised by a higher tendency for crystallisation and a higher possibility to undergo the disorder-to-order phase transition (α' to α form). The structural changes in PLA explain the observed changes in the physical and mechanical properties of the obtained fibres.
本文描述了聚丙交酯（PLA）的分子结构——以其摩尔质量和d-丙交酯异构体含量为特征——在湿法纺丝制造纤维过程中对分子有序化以及α'⁻α晶型转变的影响。通过广角X射线衍射（WAXD）和差示扫描量热法（DSC）对纤维进行了研究。此外，还测定了纤维的物理和力学性能。本研究还考察了不同拉伸比下PLA纤维的初始分子有序化和结晶情况。所进行的实验清楚地表明了湿法纺丝过程中PLA分子有序化对摩尔质量和d-丙交酯含量的依赖性。由d-丙交酯含量最低且摩尔质量最低的PLA制成的纤维具有更高的结晶倾向和更高的从无序到有序相变（α'到α晶型）可能性。PLA的结构变化解释了所获得纤维物理和力学性能中观察到的变化。
