基于丙烯酰胺为单体的红敏光致聚合物衍射效率增强的研究

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2000lp／mm时衍射效率大于90％，3000lp／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网，说明该材料适合于日益发展的全息显示。

Research on Improving Diffraction Efficiency of Red-Sensitivity Acrylamide-Based Photopolymer

At present diffraction efficiency of acrylamide-based photopolymer using polyvinyl alcohol(PVA) as binder is low at high resolution,that is,the photopolymer system has a low resolution.According to mechanism of photopolymerization the main reason is discussed and four novel methods are presented to accelerate monomers movement so as to improve diffraction efficiency.These methods include adding acrylic acid into the photopolymer system, using low polymerization degree of PVA and optimizing the layer thickness and the dry time,which have been experimentally verified.At a given condition system's diffraction efficiency using polymerization degree 341 of PVA is about 60% higher than that using polymerization degree 1750 of PVA,and diffraction efficiency of adding acrylic acid increases about 10%,system using low polymerication degree and adding acrylic acid is almost not crystaled.Both the layer thickness and the dry time have optimal range.Diffraction efficiencies of over 90% at spatial frequency about 2000 lp/mm and over 55% at 3000 lp/mm were obtained.Transmission holograms and plane reflective holograms can be fabricated by authors' material.So this material is promising to holographic display.