Kinetics investigations for holographic Bragg grating based on polymer dispersed liquid crystal

【摘要】 This paper investigates the monomer kinetics of polymer dispersed liquid crystal (PDLC) grating.Fourier transform infrared (FTIR) spectra are used in the studies of photoreaction kinetics.The results indicate that there is a relative stable stage arises after a very short initial stage.Based on FTIR studies,the monomer diffusion equation is deduced and necessary numerical simulations are carried out to analyse the monomer conversion which is an important point to improve phase separation structure of PDLC grating.Some simulation results have a good agreement with experimental data.In addition,the effects induced by monomer diffusion constant D and diffusion-polymerization-ratio rate R are discussed.Results show that monomer conversion can be improved by increasing value of D.Besides,a good equilibrium state (R=1) is more beneficial to the diffusion of monomer which is important in the process of phase separation.更多还原

【Abstract】 This paper investigates the monomer kinetics of polymer dispersed liquid crystal (PDLC) grating.Fourier transform infrared (FTIR) spectra are used in the studies of photoreaction kinetics.The results indicate that there is a relative stable stage arises after a very short initial stage.Based on FTIR studies,the monomer diffusion equation is deduced and necessary numerical simulations are carried out to analyse the monomer conversion which is an important point to improve phase separation structure of PDLC grating.Some simulation results have a good agreement with experimental data.In addition,the effects induced by monomer diffusion constant D and diffusion-polymerization-ratio rate R are discussed.Results show that monomer conversion can be improved by increasing value of D.Besides,a good equilibrium state (R=1) is more beneficial to the diffusion of monomer which is important in the process of phase separation.更多还原