聚异丙基丙烯酰胺接枝石墨烯纤维的结构及性能研究

Structure and Property Research of PNIPAM Grafted Graphene Composite Fiber

将聚异丙基丙烯酰胺(PNIPAM)与氧化石墨烯(GO)接枝,然后采用湿法纺丝方法纺制复合纤维,经氢碘酸还原后得到还原氧化石墨烯(RGO)/(PNIPAM)复合纤维。通过扫描电镜、透射电镜、红外光谱、差示扫描量热仪等对纤维的微观形态和结构进行表征,进一步研究该纤维的力学和电学性能。通过观察扫描电镜和透射电镜发现PNIPAM与RGO充分混合,红外光谱也证实了这一点。RGO/PNIPAM复合纤维玻璃化转变温度为130℃左右,随着PNIPAM的量增加,玻璃化转变温度有所增加。随着PNIPAM含量的增加,复合纤维的电阻率下降,当RGO与PNIPAM质量配比为90:10时,电阻率为2.95×10^(-4)Ω·m。随着PNIPAM比例的增加,复合纤维的强度先增加后降低,当RGO:PNIPAM为90:10时强度最低,复合纤维强度为3.82c N/tex。

Polyisopropyl acrylamide （PNIPAM） was grafted onto the graphene oxide （GO）, the compositefiber was obtained by wet spinning method and RGO/PNIPAM composite fiber was acquired through reduction byhydrogen iodide. The micromorphology and structure of the fiber were characterized by scanning electron micro-scope（SEM）, transmission electron microscope（TEM）, infrared spectrum and differential scanning calorimeter（DSC）, the mechanical and electrical properties of the fiber were further studied.The PNIPAM was well mixedwith GO under SEM and TEM and the result was confirmed by infrared spectra. The glass transition temperatureof the RGO/PNIPAM composite fiber was about 130℃ and went upward with increase of the amount of PNIPAMwhile the resistivity of composite fiber decreases. When the mass ratio of RGO to PNIPAM was 90：10, the resis-tivity was 2. 95x10-4 11 m. As the proportion of PNIPAM increased, the strength of the composite fiber in-creased first and then decreased. When the mass ratio of RGO to PNIPAM was 90： 10, the strength was lowestand it was 3.82cNltex.