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目前以丙烯酰胺为单体的光聚物体系在高分辨力下衍射效率不高。从光聚物聚合机理出发,探讨了其主要原因。从单体聚合难易程度角度提出了加入新成分丙烯酸、使用聚合度低的成膜物、增加膜的厚度和优化凉板时间等四种促进单体聚合的措施并从实验上加以了验证。结果表明:在一定条件下,成膜物使用聚合度为341的聚乙烯醇比聚合度为1750的聚乙烯醇体系衍射效率提高了约60%;加入丙烯酸后衍射效率也提高了10%左右,且使用聚合度低的成膜物和加入丙烯酸后体系更不易结晶;厚度和凉板时间均有一个最佳范围。经过优化实验后得到了空间频率在2000 lp/mm时衍射效率大于90%,3000 lp/mm时大于55%的结果,且利用制备出的材料拍摄出透射和平面反射全息图,说明该材料适合于日益发展的全息显示。
At present, the acrylamide monomer photopolymer system is not efficient in diffraction at high resolution. Starting from polymerization mechanism of photopolymer, the main reason is discussed. From the viewpoints of ease of monomer polymerization, four measures to promote the polymerization of monomers, such as adding new acrylic acid, using low degree of polymerization film, increasing the thickness of the film and optimizing the cooling time, were proposed and verified experimentally. The results show that under certain conditions, the diffraction efficiency of polyvinyl alcohol with the degree of polymerization of 341 is about 60% higher than that of the polyvinyl alcohol with degree of polymerization of 1750. The diffraction efficiency of acrylic acid is also increased by about 10% And the use of low degree of polymerization of film-forming material and the system after adding acrylic more difficult to crystallize; thickness and cooling time has an optimal range. After optimization experiments, the diffraction efficiency of more than 90% at 2000 lp / mm and more than 55% at 3000 lp / mm were obtained, and the transmission and plane reflection holograms were taken with the prepared material, indicating that the material is suitable The growing holographic display.