高性能明胶阿拉伯胶电泳微胶囊的制备及显示性能
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天津大学

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Preparation and display properties of high-performance gelatin and arabic gum electrophoretic microcapsules
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Tianjin University

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    摘要:

    电子纸显示因其具有电子显示器即时更新画面和传统纸张的节能健康等优点,成为重要的前沿显示技术领域。基于微胶囊化纳米粒子电泳原理的电子纸是反射式显示技术的研究焦点。本文将纳米二氧化钛和铁锰黑粒子分散在Isopar L中制备电泳显示分散液,以明胶和阿拉伯胶为壁材在分散液滴的表面进行复凝聚反应制备微胶囊。当反应体系为5 g电泳液(固含量为15%,黑白粒子比为1:5)分散在100 mL明胶-阿拉伯胶溶液中时,优化的制备条件为初始反应时明胶溶液pH = 7,十二烷基硫酸钠(SDS)添加量为0.2 g,分散20 min后调节pH = 4.7,冰水浴后加入适量的戊二醛,形成的微胶囊强度高、单分散性好。微胶囊平均壁厚为283 nm,在80 ℃干燥30 min后仍能保持良好的形貌。微胶囊收率为73%,其中30-50 μm微胶囊占比达到47%。以甘油为增塑剂,将制备的微胶囊与聚乙烯醇按照15:1(w/w)的比例混合均匀后,将其涂布在PET-ITO基底上制备的原型显示器件在±25 V的电场驱动下得到了白态反射率为18.88%,黑态反射率为3.51%的显示效果,响应时间为570.5 ms。

    Abstract:

    E-paper display has become an important forefront display technology field, because it has the advantages of real time updating like electronic display device, energy saving and healthy for human like traditional paper. E-paper based on the electrophoretic principle of nanoparticles in microcapsules is the research focus of reflective display technology. In this paper, the electrophoretic display dispersion liquids were prepared by that nano-titanium dioxide and manganese ferrite black spinel particles were dispersed in Isopar L, and the microcapsules were prepared by the through complex coacervation reaction on the surface of the dispersion droplets with gelatin and arabic gum used as shell materials. The microcapsules with the high strength and monodispersity are obtained under the optimized conditions in the dispersion system composed of 5.0 g electrophoretic liquids, 100 mL gelatin-arabic gum solution and 0.2 g sodium dodecyl sulfate with an initial gelatin solution pH = 7. The reaction is carried out after the pH value of the dispersion system is adjusted to 4.7 after maintaining dispersion for 20 min, then the cross-linking reaction is operated through adding a moderate amount of glutaraldehyde into the system under the ice bath. The microcapsules have an average shell thickness of 283 nm and can maintain a good shape after drying at 80 ℃ for 30 min. The yield of microcapsules is 73%, of which 30-50 μm products for 47%. The prototype display device was prepared by coating a mixture of microcapsules and polyvinyl alcohol in a ratio of 15:1 (w/w), as well as glycerin as the plasticizer on the PET-ITO substrate, and the device exhibits that the white and black state is 17.9% and 3.5%, reflectivity, and a response time of 570.5 ms under a ±25 V electric field.

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高伯楠,易小倩,张亚娟,赵谦,刘红丽,王世荣,李祥高.高性能明胶阿拉伯胶电泳微胶囊的制备及显示性能[J].精细化工,2025,42(6):

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  • 收稿日期:2024-04-18
  • 最后修改日期:2024-06-10
  • 录用日期:2024-05-20
  • 在线发布日期: 2025-06-06
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