【摘要】：電泳顯示是目前最具潛力的一種反射式顯示技術,它表現出易讀性、寬視角、質輕和超低功耗等優(yōu)點,可以替代紙張而減少森林砍伐。目前,微膠囊電泳技術的黑白顯示電子書已經商品化,但是器件在顯示的響應時間、黑白對比度和顯示穩(wěn)定性等方面仍需改進,本文對顯示中的黑粒子進行改性,以提高上述顯示性能。本文采用丙烯酸酯類聚合物對炭黑進行改性以提高粒子在環(huán)保型介質Isopar L中的分散性;利用非離子型表面活性劑對炭黑、銅鉻黑粒子進行改性,研究粒子的帶電行為,進而提高電泳顯示的顯示性能。以丙烯酸酯類聚合物對炭黑進行接枝改性,提高了粒子在Isopar L中的分散性和帶電量,其中甲基丙烯酸異辛酯接枝炭黑在Isopar L中的分散穩(wěn)定性最好,帶電量最高為36.50 mV,所制器件的黑白對比度最高(11.13),響應時間最快(527 ms)。利用聚異丁烯單丁二酰亞胺(T151)對炭黑粒子進行改性,粒子的帶電量隨著T151濃度的增大而增大,在T151濃度為2 wt.%時獲得最大的電泳淌度(-11.56×10-10 m2/Vs)及Zeta電位(-180.3 mV)。改性炭黑在Isopar L中的透射率小于18%,粒徑由未改性時的1103.5 nm減小為125±10 nm,且在30天內均沒有明顯變化;在Isopar L中可穩(wěn)定分散12個月。將以上粒子制備成原理型顯示器件,在0.20 V/μm電場強度下,器件的黑白對比度為6.6,響應時間為513ms,且穩(wěn)態(tài)效果良好。由Span80、Span85和T151改性的二氧化硅包覆銅鉻黑(銅鉻黑/SiO_2)粒子在Isopar L中帶負電,當Span80、Span85和T151的濃度分別為12、16、16 mM時粒子的帶電量最大,分別為-12.95×10-10、-14.18×10-10和-17.43×10-10 m2/Vs;當加入T151時體系的漏電流值最小,絕緣性最好;16 mM T151改性銅鉻黑/SiO_2粒子所制器件在0.30V/μm下取得相當低的響應時間189.6 ms,器件對比度為6.27。以環(huán)保型Isopar L為分散介質制備電泳顯示微膠囊,當芯材囊材的質量比為4:1、分散時間為20 min、攪拌速度為800 rpm、固化p H=8.5時所制得的明膠-阿拉伯膠電泳顯示膠囊表面光滑、粒徑分布均勻且集中在30~60μm、產率高達83.9%。將膠囊制成電泳顯示器件,可實現時鐘顯示和有源驅動顯示。
[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 鹵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.
【學位授予單位】：天津大學
【學位級別】：博士
【學位授予年份】：2015
【分類號】：TN873;TB383.1

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