石墨烯量子点对PVA偏光膜的改性

Modification of PVA Polarizing Film by Graphene Quantum Dots

用刮膜机在镜面不锈钢钢板上铺出聚乙烯醇(PVA)原膜,再经过染色、拉伸、补正等工艺制备PVA偏光膜.通过水热法制备的石墨烯量子点(GQDs)尺寸主要分布在2~4 nm,且其水溶液在500~400 nm间的光透过率下降22%,将PVA粉体溶在制得的GQDs水溶液中,制备PVA/GQDs复合偏光膜.结果表明:与PVA偏光膜相比,单片透过率略有下降,但GQDs的加入使偏光膜的直交透过率降低且低于0.1%,从而提高偏光膜的偏振度,达到99.9%以上.

The original polyvinyl alcohol(PVA)film was spread on stainless steel plate by a membrane casting equipment,and then the PVA polarizing film was prepared by dyeing,stretching and correcting.The size of graphene quantum dots(GQDs)prepared by hydrothermal method mainly distributed in 2-4 nm,and the optical transmittance of its aqueous solution decreased by 22%in the range of 500-400 nm.PVA/GQDs composite polarizing film was prepared by dissolving PVA powder in GQDs aqueous solution.The results show that compared with PVA polarizing film,the transmittance of single chip decreases slightly.However,with the addition of GQDs,the direct cross transmittance of the polarizing film is lower than 0.1%,and the polarization degree of the polarizing film is improved up to 99.9%.