4.7 Article

Ultraviolet and infrared two-wavelength modulated self-healing materials based on azobenzene-functionalized carbon nanotubes

期刊

COMPOSITES COMMUNICATIONS
卷 19, 期 -, 页码 233-238

出版社

ELSEVIER SCI LTD
DOI: 10.1016/j.coco.2020.03.014

关键词

Carbon nanotubes; Azobenzene; Self-healing; Photothermal conversion; Photo-isomerization

资金

  1. National Natural Science Foundation of China [51873061, 51622301, 51573046]
  2. Shanghai Scientific and Technological Innovation Projects [19JC1411700, 18JC1410802, 17JC400700]
  3. Sailing Program [19YF1410300]
  4. [19XD1401400]

向作者/读者索取更多资源

Photo-induced self-healing materials, which can be controlled remotely, instantly and precisely, are attracting increasing attention in various fields. However, it still remains challenging to modulate the self-healing materials with integrated functionalities possessing multiple-wavelength photo-responsiveness. Herein, we report a strategy of building a photo-responsive self-healing system capable of performing ultraviolet (UV) and near-infrared (NIR) two-wavelength induced double-repair. The strategy is based on azobenzene-functionalized multiwalled carbon nanotubes (MWCNTs) via a two-step method. Oxidized MWCNTs were first reacted subsequently with thionyl chloride, glycol, and 2-bromoisobutyryl bromide to yield MWCNT-Br macroinitiators. Then atom transfer radical polymerization (ATRP) of azobenzene monomer, 6-(4-butyl-4'-oxyazobenzene) hexyl methacrylate (Azo), was directly initiated by MWCNT-Br, affording MWCNT-PAzo nanocomposites. The MWCNT-PAzo system can undergo photothermal- and photochemical-induced solid-liquid phase transition to manipulate the self-healing behavior while MWCNTs act as photo-absorbers/heat sources and azobenzene moieties serve on glass transition temperatures (T-g) switchers, in response to NIR and UV light stimuli, respectively. To our best of knowledge, this is the first-time that MWCNT-PAzo nanocomposites possess two-wavelength photo-responsiveness and exhibit excellent self-healing performance through the irradiation of two-wavelength bands (365 and 808 nm) of UV/NIR light.

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