Journal of Textile Research ›› 2021, Vol. 42 ›› Issue (02): 12-20.doi: 10.13475/j.fzxb.20201007209

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Preparation and optical properties of flexible photonic crystal film for structural colors

WANG Xiaohui1, LI Yichen1, LIU Guojin1, TANG Zuping2, ZHOU Lan1, SHAO Jianzhong1()   

  1. 1. Engineering Research Center for Eco-Dyeing and Finishing of Textiles, Ministry of Education, Zhejiang Sci-Tech University, Hangzhou, Zhejiang 310018, China
    2. Haining Green-Guard Textile Sci-Tech Co., Ltd., Jiaxing, Zhejiang 314408, China
  • Received:2020-10-29 Revised:2020-11-16 Online:2021-02-15 Published:2021-02-23
  • Contact: SHAO Jianzhong E-mail:jshao@zstu.edu.cn

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Abstract:

To solve the problem that photonic crystal (PC) structures constructed by hard nanospheres are easy to be damaged by external forces, resulting in poor durability of the structural colors, polystyrene/poly (methyl methacrylate-butyl acrylate) (PS/P(MMA-BA)) nanospheres were synthesized by means of the step-by-step polymerization method, and the flexible PC films with structural colors were fabricated by using the prepared PS/P(MMA-BA) nanospheres as assembly blocks through melt-shear induced self-assembly method. The results show that the core cross-linking agent, divinylbenzene (DVB), is able to increase the cross-linking density and refractive index of PS core, to produce a certain refractive index contrast with the outer layer, and to make the PS core surface have double bonds, covalently bonding with the outer layer of P(MMA-BA). The outer layer cross-linking agent, allyl methacrylate (ALMA), improves the stability of the outer layer by forming some crossing-linking bonds. When DVB is 12.5% of styrene (St) and ALMA is 0.3% of the total amount of MMA and BA, PC film demonstrates excellent optical and mechanical properties. PC structures assembled by the nanospheres exhibit excellent flexibility, brilliant structural colors, and high stability during the bending, washing and rubbing tests. The melt-shear assembly method adapted to the PS/P(MMA-BA) nanospheres can rapidly fabricate large area of flexible PC film with structural colors.

Key words: flexible photonic crystal, structural color, nanosphere, cross-linking agent, structural stability, optical property, textile

CLC Number: 

  • TS193.5

Fig.1

Preparation mechanism of PS/P(MMA-BA)nanospheres"

Fig.2

Size change and distribution of PS/P(MMA-BA) particle"

Fig.3

FT-IR spectra of PS core"

Fig.4

FT-IR spectra of P(MMA-BA) and PS/P(MMA-BA)nanospheres(a)and its magnification comparison(b)"

Fig.5

SEM images of nanospheres prepared with different amount of cross-linking agent DVB"

Fig.6

Optical microscope photos of PCs films fabricated by nanosphere with different amount DVB"

Fig.7

Effect of DVB with different amount on optical and mechanical properties of PCs films. (a) Reflectance curves; (b) Stress-strain curves"

Fig.8

Optical microscope photos of PCs films fabricated by nanosphere with different amount ALMA"

Fig.9

Effect of ALMA with different amount on optical and mechanical properties of PCs films. (a) Reflectance curves; (b) Stress-strain curves"

Fig.10

Melt-shear preparation mechanism of flexible PCs films"

Fig.11

3-D surface morphologies of samples during melt-shear process. (a) Color master batch; (b) Extruded strip; (c) PCs film after hot rolling"

Fig.12

Optical properties of samples during melt-shear process"

Fig.13

SEM images of sample cross-section in melt-shear process. (a) Color master batch;(b) Extruded strip; (c) PCs film after hot rolling"

Fig.14

SEM image of PCs film surface after hot rolling"

Fig.15

Structural colors of PCs films constructed with different sized nanospheres"

Fig.16

Structural stability result of flexible PCs films. (a) Bending test; (b) Rubbing test; (c) Flushing resistance tests"

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