Journal of Textile Research ›› 2020, Vol. 41 ›› Issue (08): 63-68.doi: 10.13475/j.fzxb.20191002206

• Dyeing and Finishing & Chemicals • Previous Articles     Next Articles

Preparation and property of dye-doped liquid crystal microcapsules for electro-stimulated responsive smart textiles

SHENG Mingfei1,2, ZHANG Liping1,2, FU Shaohai1,2()   

  1. 1. Jiangsu Engineering Research Center for Digital Textile Inkjet Printing, Wuxi, Jiangsu 214122, China
    2. Key Laboratory of Eco-Textiles (Jiangnan University), Ministry of Education, Wuxi, Jiangsu 214122, China
  • Received:2019-10-10 Revised:2020-05-14 Online:2020-08-15 Published:2020-08-21
  • Contact: FU Shaohai E-mail:shaohaifu@hotmail.com

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Abstract:

Aiming at the problems that the electrochromic liquid crystal is easy to flow, difficult to shape and difficult to apply to textiles, the dichroic dyes were doped in nematic liquid crystal to form a guest-host material, which was further encapsulated in a microcapsule with polymethyl methacrylate as the shell material by emulsion polymerization. In addition, the unique optical properties of liquid crystals confinement effect were analyzed by polarizing microscope. The morphology and structure of microcapsules were characterized by scanning electron microscope, transmission electron microscope and thermal gravimetric analyzer. The influence of microcapsule coating on the driving voltage and service life of dye-doped liquid crystal were also investigated. The results show that dye-doped liquid crystal microcapsule have obvious core-shell structure, with particle size of 3 μm, core material loading of 70%, and driving voltage of 3.6 V, which is far lower than the human safety voltage. The optical appearance of the microcapsule coated on the conductive fabric can be reversibly changed from colorless state to colored state under the stimulation of direct-current power supply, which lays the foundation for optimizing the preparation process of electrochromic liquid crystal microcapsule devices and improving the flexible display performance of textiles.

Key words: smart textile, ectrochromic, dichroic dye, liquid crystal, emulsion polymerization, microcapsule

CLC Number: 

  • TS101.8

Fig.1

Structure of smart textile display device"

Fig.2

Electron microscope images of dye-dope liquid crystal microcapsules. (a) SEM image(×2 000);(b) TEM image(×10 000)"

Fig.3

Thermal performance analysis of dye-doped liquid crystal microcapsules. (a) TG curves; (b) DTG curves; (c) DSC curves"

Fig.4

Microscope photographs of dye-dope liquid crystal microcapsules(×500). (a) OM image; (b) POM image"

Fig.5

Electrochromic mechanism of dye-doped liquid crystal microcapsules"

Tab.1

Photoelectric properties of dye-doped liquid crystal before and after microencapsulation"

试样
名称		 驱动电
压/V		 透过率/% 对比
度		 循环
次数
最大 最小
微胶囊化前 2.4 91.7 38.3 2.4 小于100
微胶囊化后 3.6 90.3 34.1 2.6 大于500

Fig.6

SEM images of conductive fabric (a) and smart textile device (b) (×1 000)"

Fig.7

Photographs of smart textile device under electrochromic process. (a) OFF state; (b) ON state"

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