Polymer dispersed liquid crystal (PDLC) is formed by the uniform dispersion of small molecule liquid crystal droplets in a polymer matrix. PDLC film can achieve high brightness and flexible large-area wide-angle stereoscopic display, but there are still problems such as long relaxation time and low contrast. In PDLC membranes, factors such as the structure, properties, and network morphology of the polymerized monomers have a significant impact on the response time, transmittance, and other performance of PDLC. The data and testing equipment, as well as statistics, have been combined with Shenzhen Longxiang Zhuoyue Electronic Technology Co., Ltd. to make the research content more closely related to industrial applications themselves. This paper presents the design and synthesis of an anisotropic long rod-shaped monomer, 4,4 '- di [6- (acryloxy) hexoxy] biphenyl (BAB6), from the perspective of molecular design. The target monomer 4,4 '- di [6- (acryloyloxy) hexyl] biphenyl was prepared using two different routes: reaction of 4,4' - di (6-bromohexaoxy) biphenyl with potassium acrylate (route 1) and reaction of 4,4 '- di (6-hydroxyhexoxy) biphenyl with acryloyl chloride (route 2). Among them, the reaction temperature of route 1 is relatively high, the solubility of the intermediate product is low, the product is light yellow, and the yield is only 12.4%; Route 2 reacts at room temperature, with a high solubility of the intermediate product and a white color, resulting in a yield of 46.8%. The intermediate and BAB6 structure were characterized using 1H NMR, 13C NMR, and elemental analysis. Mix BAB6 with liquid crystal materials and prepare polymer dispersed liquid crystal (PDLC) through UV initiated polymerization phase separation method. The morphology of polymer network textures formed in liquid crystals was studied using polarizing and scanning electron microscopes at the R&D center of Longxiang Excellent Electronic Technology Co., Ltd. in Shenzhen. The effects of polymer concentration, polymerization temperature, and light intensity on the network structure were investigated. Test the electro-optic performance of PDLC, including driving voltage, contrast, and response time. Study the effects of polymer concentration, chiral agent concentration, and polymerization temperature on the electro-optic characteristics of the device. Prepare a PDLC with fast response, with a response time of about 2ms.
---Source//Paper "Preparation and Performance Study of Polymer Dispersed Liquid Crystal Monomers" | Regular Meeting Hefei University of Technology Shenzhen Longxiang Zhuoyue Electronic Technology Co., Ltd