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使用3种不同化学结构的单体材料制备了全息聚合物分散液晶光栅,并从光栅形貌、衍射能力、驱动特性、聚合物热稳定性4个方面评价了光栅的热稳定性.研究发现,含有刚性结构单体材料体系的光栅形貌、衍射能力等方面在200℃的温度下没有明显变化.表明光栅的热稳定性与单体材料的化学结构密切相关,单体材料中含有刚性结构有助于光栅热稳定性的提高.利用热重分析(TGA)对光栅中聚合物材料热分解温度进行了测定,并结合Freeman-Carroll微商法计算出了上述聚合物的分解活化能和分解反应级数.结果发现,含有刚性结构的聚合物材料的热分解温度、分解活化能和分解反应级数都高于柔性链结构材料,进一步验证了材料体系中刚性结构的添加有助于提高光栅的热稳定性.
The holographic polymer dispersed liquid crystal gratings were prepared by using three kinds of monomer materials with different chemical structures, and the thermal stability of the gratings was evaluated from four aspects of the grating morphology, the diffraction ability, the driving characteristics and the thermal stability of the polymer. There is no obvious change in the grating morphology and diffraction ability of the system containing rigid structural monomer materials at 200 ° C. It shows that the thermal stability of the grating is closely related to the chemical structure of the monomer material, Which can contribute to the improvement of the thermal stability of the grating.The thermal decomposition temperature of the polymer material in the grating is measured by thermogravimetric analysis (TGA), and the decomposition activation energy and the decomposition reaction level of the polymer are calculated in combination with the Freeman-Carroll method The results show that the thermal decomposition temperature, decomposition activation energy and decomposition reaction order of the polymer materials containing rigid structure are higher than that of the flexible chain structure material, which further verifies that the addition of rigid structure in the material system can help to increase the heat of the grating stability.