Tungsten disulfide (WS2) nanotubes (NTs) are examined here as a filler for polylactide (PLA) for their ability to accelerate PLA crystallization and for their promising biocompatibility in relevant to biomedical applications of PLA-WS2 nanocomposites. In this work, we have studied the structural and thermal properties of PLA-WS2 nanocomposite films varying the concentration of WS2 NTs from 0 (neat PLA) to 0.6 wt%. The films were uniaxially drawn at 90 °C and annealed at the same temperature for 3 and 10 min. Using wide angle x-ray scattering, Raman spectroscopy and differential scanning calorimetry, we probed the effects of WS2 NT addition on the structure of the PLA films at various stages of processing (unstretched, stretching, annealing). We found that 0.6 wt% of WS2 induces the same level of crystallinity in as stretched PLA-WS2 as annealing in neat PLA for 10 min. These data provide useful insights into the role of WS2 NTs on the structural evolution of PLA-WS2 composites under uniaxial deformation, and extend their applicability to situations where fine tuning of PLA crystallinity is desirable.

中文翻译：

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二硫化钨纳米管对单轴变形退火下聚丙交酯结晶的影响

本文检查了二硫化钨（WS2）纳米管（NTs）作为聚丙交酯（PLA）的填充剂，它们具有加速PLA结晶的能力以及与PLA-WS2纳米复合材料的生物医学应用相关的有前途的生物相容性。在这项工作中，我们研究了将WS2 NTs浓度从0（纯PLA）更改为0.6 wt％的PLA-WS2纳米复合膜的结构和热性能。将膜在90°C下单轴拉伸，并在相同温度下退火3分钟和10分钟。使用广角X射线散射，拉曼光谱和差示扫描量热法，我们研究了在加工的各个阶段（未拉伸，拉伸，退火）中添加WS2 NT对PLA膜结构的影响。我们发现0。与拉伸的PLA-WS2相比，6 wt％的WS2诱导的结晶度与在纯PLA中退火10分钟相同。这些数据提供了有关WS2 NTs在单轴变形下PLA-WS2复合材料结构演变中的作用的有用见解，并将其适用性扩展到需要微调PLA结晶度的情况。