使用3种分子结构不同的单体材料体系制备了全息聚合物分散液晶光栅,对所制备光栅的形貌、衍射特性、驱动特性、单体双键转化率等进行了研究。研究结果表明:体系中单体材料结构刚性的增加有助于相分离结构的改善。由柔性单体制备的光栅样品,双键转化率低,光栅液晶区域液晶微滴尺寸小,驱动电压高;刚性适度的样品,其光栅液晶区域液晶微滴较大,衍射能力达到96％,实际衍射效率为82%,且曝光结束后单体的单体双键转化率达到了57％,驱动电压为8.3 V/μm;随着单体材料结构刚性的继续增加,光栅液晶微滴反而变小,液晶区域变窄,驱动电压升高。因此,合理增加单体的刚性程度有助于提高光栅相分离及光栅的电光特性。

Holographic polymer dispersed liquid crystal is a kind of novel photoelectronomic information functional device. In this study,effect of chemical structure of monomers on holographic polymer dispersed liquid crystal gratings was investigated from the morphology,the diffraction efficiency,the electro-optical tunable performance and ene-conversions,respectively. The results showed that,the chemical structure of monomers plays an important role in performance of H-PDLC gratings. A rigid molecular structure forms a clear morphology,high diffraction efficiency and low threshold voltage gratings than a flexible molecular structure. In addition,the rigidity ring increases interactions between molecules and restricts the motion between them,thus enhances the phase separation,electro-optical characteristics and ene-conversions. On the other hand,with the rigid structure of monomer material increase,making the volume of LC droplets become smaller,LC regional narrow,so the drive voltage was increased,however,there is still a drop than flexible molecules. Therefore increa-sing the rigid structure of monomer reasonably can improve the phase separation and electro-optical properties of HPDLC gratings.