为了改善脲醛树脂电泳微胶囊表面的形貌和强度,选择明胶对脲醛树脂微胶囊进行改性。详细研究了明胶改性脲醛树脂微胶囊的制备条件,结果表明加成阶段最优pH值为9.0～9.5,缩聚阶段为3.0～3.5,明胶在整个反应体系中的质量分数为0.5%时得到的微胶囊表面光滑、结构致密,具有较高的强度。将得到的电泳微胶囊涂布制备成原型显示器件,在15V电场驱动下,白态反射率为39.6%,黑态反射率为4.4%,对比度达到9.0,响应时间为460ms,表现了优良的显示性能,从而得到快速响应、对比度高的八段数码时钟和有源矩阵（TFT）显示器件。
In order to improve the surface morphology and strength of UF resin electrophoretic microcapsules,the microcapsules was modified by gelatin as a modifier.The preparation conditions of gelatin-UF resin electrophoretic microcapsules had been studied in this paper.The microcapsules with smooth surface,compact structure and high strength could be obtained at the optimal condition of the preparation,in which the pH is 9.0-9.5 in the process of addition reaction and 3.0-3.5 in the condensation polymerization step,respectively,when the mass fraction of the gelatin is 0.5wt% in reaction system.The model display device was prepared by the coating of microcapsules.When the applied electric field is 15V,the reflectance of the display device is 39.6% in white state,and 4.4% in black state,the contrast ratio is 9.0,and the response time is 460ms.The device shows the excellent display performance and therefore the display device of eight segment clock and active matrix which has the property of quick response and high contrast could be obtained.
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