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首页> 外文期刊>Applied Physics. A, Materials Science & Processing >High performance holographic polymer dispersed liquid crystal systems using multi-functional acrylates and siloxane-containing epoxides as matrix components
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High performance holographic polymer dispersed liquid crystal systems using multi-functional acrylates and siloxane-containing epoxides as matrix components

机译：使用多功能丙烯酸酯和含硅氧烷的环氧化物作为基质组分的高性能全息聚合物分散液晶系统

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摘要

High performance transmission holographic polymer dispersed liquid crystals were fabricated using a mixture of radically photoporymerizable multifunctional acrylates and ring-opening photopolymerizable epoxides as monomers for matrix components with Nd:YAG laser (λ = 532 nm). Functionality of multifunctional acrylates and concentration of LC were varied to optimize the performance of holographic gratings. Gratings with much higher diffraction efficiency (83% or 67%, respectively) were obtained from recording solution composed of dipentaerythritol penta/hexaacrylate, 1-vinyl-2-pyrrolidone, commercial liquid crystal E7, and 1,3-bis(3-glycidoxypropyl)-1,1,3,3-tetramethyldisiloxane with glycidyl function linked with disiloxane, or 1,3-bis[2-(1,2-epoxycyclo-hex-4-yl)ethyl]-1,1,3,3-tetramethyldisiloxane with cyclohexene oxide function and the same siloxane spacer (45 : 9 : 10 : 36), compared with the ordinary recording solution composed of dipentaerythritol penta/hexaacrylate, 1-vinyl-2-pyrrolidone and E7 (< 2%). The recording solution composed of 1,5-bis(3-glycidoxypropyl)-1,1,3,3,5,5-hexamethyltrisiloxane and 1,5-bis[2-(1,2-epoxycyclohex-4-yl)ethyl]-1,1,3,3,5,5-hexamethyl-trisiloxane with trisiloxane spacer gave further improved diffraction efficiency (97% and 75%, respectively). Recording solutions contain trisiloxane derivatives gave gratings with considerably or moderately reduced angular deviation (0.83, 0.66 degree for trisiloxane derivatives from 1.2, 0.7 degree for disiloxane derivatives, respectively, for signal beam, and 0.76, 0.70 degree from 1.1, 1.0 degree, respectively, for the reference beam at 32 degree of external incident angle) from Bragg profile, namely 5.2 and 4.5% volume shrinkage for trisiloxane derivatives, and 7.5, 5.6% volume shrinkage for disiloxane derivatives, respectively. High diffraction efficiency over 95% with angular selectivity of 4.0 degree was obtained for the gratings formed from 1,5-bis-[2-(1,2-epoxycyclohex-4-yl)ethyl]-1,1,3,3,5,5-hexamethyltri-siloxane when the concentration of E7 was reduced to 5%. Clearly phase-separated liquid crystal domains were observed by scanning electron microscopy. Grating spacing (about 900 nm) was close to the calculated value (965 nm) by Bragg equation.
机译：使用自由基可光致聚合的多官能丙烯酸酯和开环可光致聚合的环氧化物作为基质组分的单体，通过Nd：YAG激光（λ= 532 nm），制备了高性能透射全息聚合物分散的液晶。改变多功能丙烯酸酯的功能和LC的浓度，以优化全息光栅的性能。从由季戊四醇五/六丙烯酸酯，1-乙烯基-2-吡咯烷酮，商业液晶E7和1,3-双（3-环氧丙氧基丙基）组成的记录溶液中获得衍射效率更高的光栅（分别为83％或67％）。 ）具有与二硅氧烷连接的缩水甘油基官能团的-1,1,3,3-四甲基二硅氧烷，或1,3-双[2-（1,2-环氧环己基-4-基）乙基] -1,1,3,3与由二季戊四醇五/六丙烯酸酯，1-乙烯基-2-吡咯烷酮和E7（<2％）组成的普通记录溶液相比，具有环己烯氧化物功能和相同的硅氧烷间隔基（45：9：10：3​​6）的-四甲基二硅氧烷。记录溶液由1,5-双（3-环氧丙氧基丙基）-1,1,3,3,5,5-六甲基三硅氧烷和1,5-双[2-（1,2-环氧环己基-4-基）乙基具有三硅氧烷间隔基的] -1,1,1,3,3,5,5-六甲基-三硅氧烷给出了进一步提高的衍射效率（分别为97％和75％）。包含三硅氧烷衍生物的记录溶液使光栅的角偏差显着或适度减小（三硅氧烷衍生物的信号束分别从1.2度的0.73度变为0.63，二硅氧烷衍生物的信号束从0.7度的0.76度变为0.66度，而0.76度从0.7度变为0.70度对于参考光束，其入射角为32度（来自外部入射角），即三硅氧烷衍生物的体积收缩率分别为5.2和4.5％，二硅氧烷衍生物的体积收缩率分别为7.5和5.6％。由1,5-双-[2-（2-（1,2-环氧-环己基-4-基）乙基] -1,1,3,3，当E7的浓度降低到5％时的5，5-六甲基三硅氧烷。通过扫描电子显微镜观察到明显相分离的液晶域。光栅间距（约900 nm）接近于布拉格方程的计算值（965 nm）。

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