MWNTs/PU复合微/纳米纤维的形态及力学性能

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。 

Morphology and mechanical properties of MWNTs/ PU compound nanof ibers

The elect rospinning was used to produce multi 2 walled nanotubes (MWNTs) and polyurethane ( PU) compound nanofibers. The morphology and microst ructure of the compound nanofibers were analyzed by scanning elect ron microscope (SEM) and t ransmission elect ron microscopy ( TEM) . The crystallization and glass t ransition temperature ( T g) of the membranes were examined by XRD and DSC analysis. The relationship between the tensile properties of the membranes and the mass f raction of the MWNTs was revealed by tensile testing. The result s show that the MWNTs with a suitable content can be efficiently dispersed in PU solutions and compound ult rafine 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 T g becomes higher . Furthermore , the tensile st rength and elongation at break of the studied membranes increase with the increase of MWNTs content in the hybrid nanofibers.