Fabrication of Electrophoretic Particles by Polymer Encapsulation and Characterization of Their Dispersion Stability Using UV Transmittance Method
电泳显示器用聚合物包覆颗粒的制备及其分散稳定性的紫外透光率表征

Black pigment nanoparticles were modified with a series of monomers with different polarities by radical grafting polymerization,and the effects of these polymer coating layers on the dispersion stability of copper chromite nanoparticles used in electrophoretic medium were examined by transmittance method.The results show that the stabilization time of particles in nonaqueous medium at least has increased 5 times after polymer modification,and the longer the side chain of monomer,the stabler the particles.When the monomer with an alkyl chain containing more than 4 carbon atoms,the corresponding polymer layers will impart good dispersibility to particles.The final black/white electrophoretic display has a response time of less than 1 s and contrast of(4-5):1 under a bias voltage of 5 V.The present results will provide a guideline for polymer modification of electrophoretic particle and theoretical foundation for improving electrophoretic medium stability and lifetime of electrophoretic display.