MWNTs/PU复合微/纳米纤维的形态及力学性能

Morphology and mechanical properties of MWNTs/PU compound nanofibers

应用静电纺丝技术制备多壁碳纳米管/聚氨酯(MWNTs/PU)复合微/纳米纤维,将该复合纤维收集成无纺布薄膜,采用扫描电子显微镜(SEM)和透射电子显微镜(TEM)观察了纤维的微观形貌和结构,分别利用X射线衍射(XRD)和差示扫描量热法(DSC)测试了复合纤维的结晶行为及玻璃态转变温度,并测试了纤维薄膜的拉伸力学性能随MWNTs含量的变化关系。结果表明,一定含量的MWNTs能有效地分散于PU溶液中,并能成功地纺出MWNTs/PU复合微/纳米纤维。随MWNTs在PU纤维中含量的增加,纤维的直径变细,复合纤维的玻璃态转变温度提高。在所研究的含量范围内,无纺布的拉伸强度和断裂伸长率随MWNTs含量的增加而有所增大。

The electrospinning was used to produce multi-walled nanotubes （MWNTs） and polyurethane（PU） compound nanofibers. The morphology and microstructure of the compound nanofibers were analyzed by scanning electron microscope （SEM） and transmission electron microscopy （TEM）. The crystallization and glass transition temperature（Tg） of the membranes were examined by XRD and DSC analysis. The relationship between the tensile properties of the membranes and the mass fraction of the MWNTs was revealed by tensile testing. The results show that the MWNTs with a suitable content can be efficiently dispersed in PU solutions and compound ultrafine fibers can be obtained. With the increasing of the content of the MWNTs in PU solutions, the diameters of the compound nanofibers become smaller, while the Tg becomes higher. Furthermore, the tensile strength and elongation at break of the studied membranes increase with the increase of MWNTs content in the hybrid nanofibers.