山梨醇掺杂对PVA/PEDOT∶PSS共混纤维结构和导电性能的影响

Influence of sorbitol doping on the structure and electrical conductivity of PVA/PEDOT∶PSS blended fibers

为改善PVA/PEDOT∶PSS共混纤维的导电性能,采用湿法纺丝的方法,通过向PVA/PEDOT∶PSS混合纺丝液中添加山梨醇,制备出经山梨醇掺杂的PVA/PEDOT∶PSS共混纤维。采用红外光谱分析仪(FTIR),高阻计,X射线衍射仪(XRD),显微共聚焦激光拉曼光谱仪,扫描电子显微镜(SEM),电子单纤维强力仪对共混纤维的结构与性能进行测试表征。通过对比分析掺杂前后共混纤维电导率的变化,探究了山梨醇掺杂对PVA/PEDOT∶PSS共混纤维结构和导电性能的影响。结果表明,山梨醇掺杂可以改善PVA/PEDOT∶PSS共混纤维的导电性能,掺杂质量分数为7%时,共混纤维电导率达到19.1S/cm。XRD结果显示,掺杂未改变PVA/PEDOT∶PSS共混纤维的结晶性能和聚集态结构;拉曼光谱显示,掺杂使得PEDOT的主要特征峰红移,PEDOT主链发生苯-醌转变;掺杂使得共混纤维的表面逐渐变得光滑;掺杂后,共混纤维的拉伸强度升高,断裂伸长降低。

In order to improve the electrical conductivity of PVA/PEDOT∶PSS blended fibers,sorbitol was added,as a dopant,into PVA/PEDOT∶PSS blended spinning formulation.The modified PVA/PEDOT∶PSS blended fibers were prepared employing wet-spinning technique.The microstructures and properties were tested and characterized by Fourier transform infrared spectroscopy（FT-IR）,electrometer,X-ray diffraction（XRD）,laser Raman co-focal microspectrometry,scanning electron microscopy（SEM）and single fiber strength tester.The results shows that electrical conductivity of PVA/PEDOT∶PSS blended fibers improved slightly by sorbitol doping.The XRD shows that the amorphous state of sorbitol-doped blended fibers does not change;the Raman shows that the main characteristic absorption peak shifts to red,indicating that the PEDOT backbone turns from ＂benzoid structure＂into＂quinoid structure＂;the SEM shows that the surface of blended fibers turns smooth gradually;the tensile strength of the blended fibers increase slightly,the elongation at break decreases slightly.