Fast-scanning calorimetry of electrospun polyamide nanofibres: Melting behaviour and crystal structure
Fast-scanning calorimetry of electrospun polyamide nanofibres: Melting behaviour and crystal structure
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DOI：
10.1016/j.polymer.2013.10.032
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发表时间：
2013-11
期刊：
影响因子：
4.6
通讯作者：
I. Steyaert;M. Delplancke;G. Assche;H. Rahier;K. Clerck
中科院分区：
文献类型：
--
作者：
I. Steyaert;M. Delplancke;G. Assche;H. Rahier;K. Clerck
本文讨论了电纺（多晶型）聚酰胺 (PA) 纤维的熔融行为和晶体结构，并介绍了热分析研究中加热速率的重要性。使用快速加热冷却 DSC (RHC) 对 PA6、PA46 和 PA69 纳米纤维进行案例研究，这是一种快速扫描量热计，能够将加热速率控制在 1000 K min−1 以上。当扫描速率高于 500 K min−1 时，热滞后变得显着，并且用于分析晶体结构的理想扫描速率取决于 PA 类型。在最合适的加热速率下进行的测量表明，与块状材料相比，纳米纤维晶体的热稳定性更高。此外，更细的纳米纤维更倾向于更稳定的晶体。 PA6 纳米纤维尤其如此，如热分析和 X 射线衍射所示，随着纤维直径的减小，稳定 α 晶相的比例不断增加。
This paper discusses the melting behaviour and crystal structure of electrospun (polymorphous) polyamide (PA) fibres and presents the importance of the heating rate used for their study by thermal analysis. A case study of PA6, PA46 and PA69 nanofibres is performed using a Rapid Heat-Cool DSC (RHC), a fast-scanning calorimeter capable of controlled heating rates above 1000 K min−1. Thermal lag becomes significant at scan rates above 500 K min−1and the ideal scan rate for analysis of the crystal structure depends on the PA type. Measurements at the most suitable heating rate indicate that the thermal stability of the crystals is higher for nanofibres compared to bulk material. Additionally, more stable crystals are favoured in finer nanofibres. This is especially the case for PA6 nanofibres, having an increasing fraction of stable α-crystal phase with decreasing fibre diameter, as shown by both thermal analysis and X-ray diffraction.