丙烯酰胺基光致聚合物全息光栅的动力学研究

Dynamics of acrylamide-based photopolymer holographic gratings

研究了光致聚合物的光化学反应和单体扩散反应的理论模型及动力学参数.合成了以聚乙烯醇为粘结剂,三乙醇胺为引发剂,藻红B敏化的丙烯酰胺基光致聚合物全息存储材料,通过对测定的透过率和衍射效率进行曲线拟合,分析了染料浓度对光致聚合物的摩尔吸收系数ε、量子产率Φ和光化漂白速率常数k等光化动力学参数的影响规律,以及曝光强度对聚合反应速率k0、扩散时间常数τD和最大折射率调制度Δn等扩散动力学参数的影响规律.

The theoretical photochemical and photopolymerization diffusion model and the dynamic parameters of the photopolymer are studied. A new holographic photopolymer which is composed of acrylamide as monomer, ployvinylalcohol as binder, triethanolamine as initiator sensitized by erythrosine B is prepared. By means of fitting the experimental data of transmittance and diffraction efficiency as a function of time, the influence of the molar-absorption coefficient ε, the quantum yield Φ and the photobleaching coefficient k in photochemical dynamics for different concentrations of erythrosine B, and polymerization rate k0, diffusion time constant τD and the maximal refractive index modulation Δn in photopolymerization diffusion dynamics for different exposure intensity, are presented.