Structure-morphology correlation in electrospun fibers of semicrystalline polymers by simultaneous synchrotron SAXS-WAXD
Structure-morphology correlation in electrospun fibers of semicrystalline polymers by simultaneous synchrotron SAXS-WAXD
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DOI：
10.1016/j.polymer.2015.03.002
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发表时间：
2015-04-20
期刊：
影响因子：
4.6
通讯作者：
Focarete, M. L.
中科院分区：
文献类型：
--
作者：
Gazzano, M.;Gualandi, C.;Focarete, M. L.
同时进行SAXS-WAXD测量，以获得有关的微观结构和分子取向的信息，在静电纺丝过程中的聚合物链。研究了三种半结晶聚合物，即聚丙烯腈、尼龙6，6和聚（环氧乙烷），作为具有随机排列或对齐的电纺纤维的非织造垫。垫的热性能和形态学性能进行了研究，连同它们的结构细节，以获得它们的层次结构从宏观到纳米尺度。SAXS图案具有椭圆形状，其主轴沿着赤道方向。没有反射是明显的沿着纵向方向，表明所研究的静电纺丝纤维具有原纤结构，没有层状形态的痕迹。结合晶胞和晶体尺寸的值，可以得出结论，在纤维中，由于大约10个晶胞的横向聚集和在链方向上约50个（尼龙6，6和聚丙烯腈）或25个（聚（环氧乙烷））晶胞的规则有序，有序域被组织成一束原纤维。(C)2015爱思唯尔有限公司版权所有。
Simultaneous SAXS-WAXD measurements are carried out to gain information about the microstructure and the molecular orientation developed by polymeric chains during the electrospinning process. Three semicrystalline polymers were studied, namely polyacrylonitrile, Nylon 6,6, and poly(ethylene oxide), as non-woven mats with either randomly arranged or aligned electrospun fibers. Mat thermal and morphological properties are investigated, together with their structural details in order to derive their hierarchical structure from the macro to the nano-scale. SAXS patterns have an elliptical shape with the main axis along the equator direction. No reflections are noticeable along the meridional direction, suggesting that the investigated electrospun fibers have a fibrillar structure with no trace of lamellar morphology. Combining the values of the unit cell and of the crystal size it can be concluded that in the fibers the ordered domains are organized into a bundle of fibrils due to the lateral aggregation of roughly 10 unit cells and the regular ordering of about either 50 (Nylon 6,6 and polyacrylonitrile) or 25 (poly(ethylene oxide)) cells in the chain direction. (C) 2015 Elsevier Ltd. All rights reserved.