环保型介质中电泳显示用黑色纳米粒子的改性
发布时间：2018-11-18 10:09
【摘要】：电泳显示是目前最具潜力的一种反射式显示技术,它表现出易读性、宽视角、质轻和超低功耗等优点,可以替代纸张而减少森林砍伐。目前,微胶囊电泳技术的黑白显示电子书已经商品化,但是器件在显示的响应时间、黑白对比度和显示稳定性等方面仍需改进,本文对显示中的黑粒子进行改性,以提高上述显示性能。本文采用丙烯酸酯类聚合物对炭黑进行改性以提高粒子在环保型介质Isopar L中的分散性;利用非离子型表面活性剂对炭黑、铜铬黑粒子进行改性,研究粒子的带电行为,进而提高电泳显示的显示性能。以丙烯酸酯类聚合物对炭黑进行接枝改性,提高了粒子在Isopar L中的分散性和带电量,其中甲基丙烯酸异辛酯接枝炭黑在Isopar L中的分散稳定性最好,带电量最高为36.50 mV,所制器件的黑白对比度最高(11.13),响应时间最快(527 ms)。利用聚异丁烯单丁二酰亚胺(T151)对炭黑粒子进行改性,粒子的带电量随着T151浓度的增大而增大,在T151浓度为2 wt.%时获得最大的电泳淌度(-11.56×10-10 m2/Vs)及Zeta电位(-180.3 mV)。改性炭黑在Isopar L中的透射率小于18%,粒径由未改性时的1103.5 nm减小为125±10 nm,且在30天内均没有明显变化;在Isopar L中可稳定分散12个月。将以上粒子制备成原理型显示器件,在0.20 V/μm电场强度下,器件的黑白对比度为6.6,响应时间为513ms,且稳态效果良好。由Span80、Span85和T151改性的二氧化硅包覆铜铬黑(铜铬黑/SiO_2)粒子在Isopar L中带负电,当Span80、Span85和T151的浓度分别为12、16、16 mM时粒子的带电量最大,分别为-12.95×10-10、-14.18×10-10和-17.43×10-10 m2/Vs;当加入T151时体系的漏电流值最小,绝缘性最好;16 mM T151改性铜铬黑/SiO_2粒子所制器件在0.30V/μm下取得相当低的响应时间189.6 ms,器件对比度为6.27。以环保型Isopar L为分散介质制备电泳显示微胶囊,当芯材囊材的质量比为4:1、分散时间为20 min、搅拌速度为800 rpm、固化p H=8.5时所制得的明胶-阿拉伯胶电泳显示胶囊表面光滑、粒径分布均匀且集中在30~60μm、产率高达83.9%。将胶囊制成电泳显示器件,可实现时钟显示和有源驱动显示。
[Abstract]:Electrophoretic display (electrophoresis) is one of the most promising reflective display techniques at present. It has the advantages of readability, wide viewing angle, light weight and ultra-low power consumption, which can replace paper and reduce deforestation. At present, the black and white display e-books of microcapsule electrophoresis technology have been commercialized, but the display response time, black-and-white contrast and display stability still need to be improved. In this paper, the black particles in the display are modified. To improve the performance of the above display. In this paper, acrylates polymer was used to modify carbon black in order to improve the dispersity of the particles in the environment-friendly medium Isopar L; Carbon black and copper chromium black particles were modified by Nonionic surfactants to study the charged behavior of the particles and to improve the display performance of electrophoretic display. Graft modification of carbon black with acrylate polymer can improve the dispersion and electrical capacity of the particles in Isopar L. the dispersion stability of carbon black grafted with isooctyl methacrylate in Isopar L is the best, and the maximum band charge is 36.50 mV,. The device has the highest black-and-white contrast (11.13) and the fastest response time (527 ms). Carbon black particles were modified by polyisobutene monosuccinimide (T151). The maximum electrophoretic mobility (-11.56 脳 10-10 m2/Vs) and Zeta potential (- 180.3 mV).) were obtained at T151 concentration of 2 wt.%. The transmittance of modified carbon black in Isopar L was less than 18%, the particle size decreased from 1103.5 nm to 125 卤10 nm, and had no obvious change within 30 days, and the modified carbon black could be dispersed stably in Isopar L for 12 months. The above particles were fabricated into a principle display device. Under the electric field intensity of 0.20 V / 渭 m, the black-and-white contrast of the device is 6.6, the response time is 513 Ms, and the steady-state effect is good. The copper chromium black (copper-chrome black / SiO_2) particles coated with silica modified by Span80,Span85 and T151 are negatively charged in Isopar L. The maximum charged amount of the particles is -12.95 脳 10 ~ (-10) when the concentration of Span80,Span85 and T151 is 121.16 ~ (16) mM, respectively. -14.18 脳 10-10 and -17.43 脳 10-10 m2 / Vs; When T151 was added, the leakage current value of the system was the smallest and the insulation was the best, and the contrast of 189.6 ms, devices with 16 mM T151 modified copper chromium black / SiO_2 particles was 6.27 at 0.30V/ 渭 m. Electrophoretic display microcapsules were prepared with environmentally friendly Isopar L as dispersing medium. When the mass ratio of core material to capsule material was 4: 1, and the dispersing time was 20 min, the agitating speed was 800 rpm,. Gel electrophoresis of gelatin-Arabic gel prepared by solidified pH 8.5 shows that the surface of the capsule is smooth, the particle size distribution is uniform and the concentration is 300.60 渭 m, and the yield is as high as 83.9%. The capsule is made into electrophoretic display device, which can realize clock display and active drive display.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TN873;TB383.1
本文编号：2339748
[Abstract]:Electrophoretic display (electrophoresis) is one of the most promising reflective display techniques at present. It has the advantages of readability, wide viewing angle, light weight and ultra-low power consumption, which can replace paper and reduce deforestation. At present, the black and white display e-books of microcapsule electrophoresis technology have been commercialized, but the display response time, black-and-white contrast and display stability still need to be improved. In this paper, the black particles in the display are modified. To improve the performance of the above display. In this paper, acrylates polymer was used to modify carbon black in order to improve the dispersity of the particles in the environment-friendly medium Isopar L; Carbon black and copper chromium black particles were modified by Nonionic surfactants to study the charged behavior of the particles and to improve the display performance of electrophoretic display. Graft modification of carbon black with acrylate polymer can improve the dispersion and electrical capacity of the particles in Isopar L. the dispersion stability of carbon black grafted with isooctyl methacrylate in Isopar L is the best, and the maximum band charge is 36.50 mV,. The device has the highest black-and-white contrast (11.13) and the fastest response time (527 ms). Carbon black particles were modified by polyisobutene monosuccinimide (T151). The maximum electrophoretic mobility (-11.56 脳 10-10 m2/Vs) and Zeta potential (- 180.3 mV).) were obtained at T151 concentration of 2 wt.%. The transmittance of modified carbon black in Isopar L was less than 18%, the particle size decreased from 1103.5 nm to 125 卤10 nm, and had no obvious change within 30 days, and the modified carbon black could be dispersed stably in Isopar L for 12 months. The above particles were fabricated into a principle display device. Under the electric field intensity of 0.20 V / 渭 m, the black-and-white contrast of the device is 6.6, the response time is 513 Ms, and the steady-state effect is good. The copper chromium black (copper-chrome black / SiO_2) particles coated with silica modified by Span80,Span85 and T151 are negatively charged in Isopar L. The maximum charged amount of the particles is -12.95 脳 10 ~ (-10) when the concentration of Span80,Span85 and T151 is 121.16 ~ (16) mM, respectively. -14.18 脳 10-10 and -17.43 脳 10-10 m2 / Vs; When T151 was added, the leakage current value of the system was the smallest and the insulation was the best, and the contrast of 189.6 ms, devices with 16 mM T151 modified copper chromium black / SiO_2 particles was 6.27 at 0.30V/ 渭 m. Electrophoretic display microcapsules were prepared with environmentally friendly Isopar L as dispersing medium. When the mass ratio of core material to capsule material was 4: 1, and the dispersing time was 20 min, the agitating speed was 800 rpm,. Gel electrophoresis of gelatin-Arabic gel prepared by solidified pH 8.5 shows that the surface of the capsule is smooth, the particle size distribution is uniform and the concentration is 300.60 渭 m, and the yield is as high as 83.9%. The capsule is made into electrophoretic display device, which can realize clock display and active drive display.
【学位授予单位】：天津大学
【学位级别】：博士
【学位授予年份】：2015
【分类号】：TN873;TB383.1
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