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

doi:10.11896/cldb.21010229

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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 (T_off and T_on) and haze under off-state and on-state as well as threshold and saturation voltages (V_th and V_sat) 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 T_off of 7.05%, T_on of 66.6%, off-state haze of 90%, on-state (60 V) haze of 15.6%, V_th of 17 V and V_sat 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

Published: 25 April 2022 Online: 2022-04-27

CLC number:

TN27

Fund:National Natural Science Foundation of China (50902105).

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	Articles by authors
	YI Changhong
	HU Gang
	ZHU Bailin
	CHEN Hongxiang
	WU Jun
	GU Huazhi

Cite this article:

YI Changhong,HU Gang,ZHU Bailin, et al. Thermosetting Epoxy-based Polymer Dispersed Liquid Crystal (PDLC) Film Prepared by Quenching Process and Optimization of Their Optical Switching Properties[J]. Materials Reports, 2022, 36(8): 21010229-8.

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http://www.mater-rep.com/EN/10.11896/cldb.21010229 OR http://www.mater-rep.com/EN/Y2022/V36/I8/21010229

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