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材料导报  2022, Vol. 36 Issue (8): 21010229-8    https://doi.org/10.11896/cldb.21010229
  高分子与聚合物基复合材料 |
淬火法制备热固化环氧树脂基聚合物分散液晶膜及其调光性能的优化
易昌鸿1, 胡钢2, 祝柏林1, 陈红祥2, 吴隽1, 顾华志1
1 武汉科技大学省部共建耐火材料与冶金国家重点实验室,武汉 430081
2 武汉科技大学化学与化工学院,武汉 430081
Thermosetting Epoxy-based Polymer Dispersed Liquid Crystal (PDLC) Film Prepared by Quenching Process and Optimization of Their Optical Switching Properties
YI Changhong1, HU Gang2, ZHU Bailin1, CHEN Hongxiang2, WU Jun1, GU Huazhi1
1 The State Key Laboratory of Refractories and Metallurgy, Wuhan University of Science and Technology, Wuhan 430081, China
2 School of Chemistry and Chemical Engineering, Wuhan University of Science and Technology, Wuhan 430081, China
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摘要 聚合物分散液晶(PDLC)膜是液晶(LC)微滴分布在聚合物网络结构中形成的一种通过施加电压实现雾化态与透明态转换的材料,可应用于智能调光玻璃等领域。以双酚A环氧树脂(EP)与两种不同分子量的聚醚二胺(D400和D2000)反应生成的交联聚合物作为PDLC膜的基体,在采用淬火工艺的基础上,研究了LC浓度、固化温度和固化时间以及EP、D400、D2000配比对PDLC样品的关态与开态透光率(Toff和Ton)、雾度及驱动和饱和电压(Vth和Vsat)的影响,同时用偏光显微镜观察了LC微滴的尺寸与分布密度。结果表明:当LC浓度为38%(质量分数),固化温度和固化时间分别为100 ℃、2 h,EP、D400、D2000物质的量比为4.4∶1.75∶1时,PDLC膜的综合性能最优,即:Toff为7.05%,Ton为66.6%,Vth为17 V,Vsat为33 V,关态雾度为90%,加60 V电压的开态雾度为15.6%。另外,分析了PDLC膜的调光性能与其LC微滴大小、分布及树脂网络结构致密度的关系。
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易昌鸿
胡钢
祝柏林
陈红祥
吴隽
顾华志
关键词:  聚合物分散液晶膜  环氧树脂  热固化  淬火工艺  调光性能    
Abstract: Polymer-dispersed liquid crystal (PDLC) film, which is formed by dispersing liquid crystal (LC) droplets into a polymer network structure, is a kind of material that can realize the conversion between the opaque and the transparent state by exerting a voltage. It can be widely used in fields such as smart switchable glass. In this work, the crosslinking reaction products of bisphenol A epoxy resin (EP) and two polyether dia-mines with different molecular weights (D400 and D2000) were used as the PDLC matrix. Based on the quenching process, the effects of LC concentration, curing temperature and time, and n(EP)∶n(D400)∶n(D2000) on the transmittance (Toff and Ton) and haze under off-state and on-state as well as threshold and saturation voltages (Vth and Vsat) of PDLC samples were investigated. At the same time, the size and distribution density of the LC droplets were observed by polarizing microscope. The results show that the PDLC film with best overall performance is obtained at the LC concentration of 38 wt%, the curing temperature of 100 ℃, the curing time of 2 h and the n(EP)∶n(D400)∶n(D2000) of 4.4∶1.75∶1; namely, PDLC film shows Toff of 7.05%, Ton of 66.6%, off-state haze of 90%, on-state (60 V) haze of 15.6%, Vth of 17 V and Vsat of 33 V. In addition, the effects of size and distribution of LC droplet as well as compactness of resin network structure on the optical switching performance of PDLC film were also analyzed.
Key words:  polymer dispersed liquid crystal (PDLC) film    epoxy resin    heat curing    quenching process    optical switching properties
出版日期:  2022-04-25      发布日期:  2022-04-27
ZTFLH:  TN27  
基金资助: 国家自然科学基金(50902105)
通讯作者:  blzhu@wust.edu.cn   
作者简介:  易昌鸿,1995年生,2018年于江西理工大学获得工学学士学位,2021年于武汉科技大学获得工学硕士学位。主要研究方向为聚合物分散液晶调光膜与透明导电薄膜。
祝柏林,1977年生,1998年于洛阳工学院获工学学士学位,2003年于华中科技大学获材料学专业博士学位。目前为武汉科技大学材料与冶金学院教授,主要从事透明导电薄膜的制备与应用以及有机-无机复合材料的研究。
引用本文:    
易昌鸿, 胡钢, 祝柏林, 陈红祥, 吴隽, 顾华志. 淬火法制备热固化环氧树脂基聚合物分散液晶膜及其调光性能的优化[J]. 材料导报, 2022, 36(8): 21010229-8.
YI Changhong, HU Gang, ZHU Bailin, CHEN Hongxiang, WU Jun, GU Huazhi. Thermosetting Epoxy-based Polymer Dispersed Liquid Crystal (PDLC) Film Prepared by Quenching Process and Optimization of Their Optical Switching Properties. Materials Reports, 2022, 36(8): 21010229-8.
链接本文:  
http://www.mater-rep.com/CN/10.11896/cldb.21010229  或          http://www.mater-rep.com/CN/Y2022/V36/I8/21010229
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