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Hydrogen-bonding-supported self-healing antifogging thin films.

Zhang X, He J - Sci Rep (2015)

Bottom Line: Inspired by the repair of DNA through efficient reformation of hydrogen bonds (H-bonds), herein we report a facile one-step approach to construction of self-healing antifogging thin films on the basis of partly cross-linked poly(vinyl alcohol)(PVA) and poly(acrylic acid)(PAA).The thin films showed smart intrinsic self-healing characteristics towards wounds caused by external forces, which is attributed to sufficient free hydroxyl groups at the scratched interfaces to reform H-bonds across the interfaces and a sufficient chain mobility that is indispensable for chain diffusion across the interfaces and hydroxyl groups association to form H-bonds.No synthetic surfaces reported so far possess all the unique characteristics of the polymer thin films: intrinsic self-healing, long-term antifogging, excellent mechanical property, high transmittance and large-scale feasibility.

View Article: PubMed Central - PubMed

Affiliation: 1] Functional Nanomaterials Laboratory, Center for Micro/Nanomaterials and Technology and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancundonglu 29, Haidianqu, Beijing 100190, China [2] University of Chinese Academy of Sciences, Beijing 100864, China.

ABSTRACT
Inspired by the repair of DNA through efficient reformation of hydrogen bonds (H-bonds), herein we report a facile one-step approach to construction of self-healing antifogging thin films on the basis of partly cross-linked poly(vinyl alcohol)(PVA) and poly(acrylic acid)(PAA). By designing the molar ratio of hydroxyl groups to carboxyl groups, the cross-linked polymer thin films maintain abundant free hydroxyl groups to present excellent antifogging property, which is derived from the hydrophilicity and hygroscopicity of the thin films. The thin films showed smart intrinsic self-healing characteristics towards wounds caused by external forces, which is attributed to sufficient free hydroxyl groups at the scratched interfaces to reform H-bonds across the interfaces and a sufficient chain mobility that is indispensable for chain diffusion across the interfaces and hydroxyl groups association to form H-bonds. No synthetic surfaces reported so far possess all the unique characteristics of the polymer thin films: intrinsic self-healing, long-term antifogging, excellent mechanical property, high transmittance and large-scale feasibility.

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Related in: MedlinePlus

(a) Transmission spectra of blank glass and polymer-coated glass. (b) Transmission spectra of polymer-coated glass before and after 50 washing tests. The film was washed for up to 50 cycles using a sponge at a rate of 50 cycles per minute. If a film is not washed off, the thin film is believed to have good washability and can endure practical washing. (c) Digital image exhibiting antifogging property of polymer-coated glass after 50 washing tests. (d) Digital image exhibiting antifogging property of polymer-coated glass after 100 tape peeling tests. Tape peeling test was applied to examine the adhesion-to-substrate of the thin film. A tape peeling test was carried out by first pressing 3 M Scotch tape (cat. 600) on and then peeling off the thin film. One hundred peeling tests were applied.
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f4: (a) Transmission spectra of blank glass and polymer-coated glass. (b) Transmission spectra of polymer-coated glass before and after 50 washing tests. The film was washed for up to 50 cycles using a sponge at a rate of 50 cycles per minute. If a film is not washed off, the thin film is believed to have good washability and can endure practical washing. (c) Digital image exhibiting antifogging property of polymer-coated glass after 50 washing tests. (d) Digital image exhibiting antifogging property of polymer-coated glass after 100 tape peeling tests. Tape peeling test was applied to examine the adhesion-to-substrate of the thin film. A tape peeling test was carried out by first pressing 3 M Scotch tape (cat. 600) on and then peeling off the thin film. One hundred peeling tests were applied.

Mentions: The transmission spectra of blank glass substrate and polymer-coated glass substrate are shown in Figure 4a. The thin film only lowers the transmittance slightly as compared with blank glass substrate. Thus the thin film is highly transparent.


Hydrogen-bonding-supported self-healing antifogging thin films.

Zhang X, He J - Sci Rep (2015)

(a) Transmission spectra of blank glass and polymer-coated glass. (b) Transmission spectra of polymer-coated glass before and after 50 washing tests. The film was washed for up to 50 cycles using a sponge at a rate of 50 cycles per minute. If a film is not washed off, the thin film is believed to have good washability and can endure practical washing. (c) Digital image exhibiting antifogging property of polymer-coated glass after 50 washing tests. (d) Digital image exhibiting antifogging property of polymer-coated glass after 100 tape peeling tests. Tape peeling test was applied to examine the adhesion-to-substrate of the thin film. A tape peeling test was carried out by first pressing 3 M Scotch tape (cat. 600) on and then peeling off the thin film. One hundred peeling tests were applied.
© Copyright Policy - open-access
Related In: Results  -  Collection

License
Show All Figures
getmorefigures.php?uid=PMC4363865&req=5

f4: (a) Transmission spectra of blank glass and polymer-coated glass. (b) Transmission spectra of polymer-coated glass before and after 50 washing tests. The film was washed for up to 50 cycles using a sponge at a rate of 50 cycles per minute. If a film is not washed off, the thin film is believed to have good washability and can endure practical washing. (c) Digital image exhibiting antifogging property of polymer-coated glass after 50 washing tests. (d) Digital image exhibiting antifogging property of polymer-coated glass after 100 tape peeling tests. Tape peeling test was applied to examine the adhesion-to-substrate of the thin film. A tape peeling test was carried out by first pressing 3 M Scotch tape (cat. 600) on and then peeling off the thin film. One hundred peeling tests were applied.
Mentions: The transmission spectra of blank glass substrate and polymer-coated glass substrate are shown in Figure 4a. The thin film only lowers the transmittance slightly as compared with blank glass substrate. Thus the thin film is highly transparent.

Bottom Line: Inspired by the repair of DNA through efficient reformation of hydrogen bonds (H-bonds), herein we report a facile one-step approach to construction of self-healing antifogging thin films on the basis of partly cross-linked poly(vinyl alcohol)(PVA) and poly(acrylic acid)(PAA).The thin films showed smart intrinsic self-healing characteristics towards wounds caused by external forces, which is attributed to sufficient free hydroxyl groups at the scratched interfaces to reform H-bonds across the interfaces and a sufficient chain mobility that is indispensable for chain diffusion across the interfaces and hydroxyl groups association to form H-bonds.No synthetic surfaces reported so far possess all the unique characteristics of the polymer thin films: intrinsic self-healing, long-term antifogging, excellent mechanical property, high transmittance and large-scale feasibility.

View Article: PubMed Central - PubMed

Affiliation: 1] Functional Nanomaterials Laboratory, Center for Micro/Nanomaterials and Technology and Key Laboratory of Photochemical Conversion and Optoelectronic Materials, Technical Institute of Physics and Chemistry, Chinese Academy of Sciences, Zhongguancundonglu 29, Haidianqu, Beijing 100190, China [2] University of Chinese Academy of Sciences, Beijing 100864, China.

ABSTRACT
Inspired by the repair of DNA through efficient reformation of hydrogen bonds (H-bonds), herein we report a facile one-step approach to construction of self-healing antifogging thin films on the basis of partly cross-linked poly(vinyl alcohol)(PVA) and poly(acrylic acid)(PAA). By designing the molar ratio of hydroxyl groups to carboxyl groups, the cross-linked polymer thin films maintain abundant free hydroxyl groups to present excellent antifogging property, which is derived from the hydrophilicity and hygroscopicity of the thin films. The thin films showed smart intrinsic self-healing characteristics towards wounds caused by external forces, which is attributed to sufficient free hydroxyl groups at the scratched interfaces to reform H-bonds across the interfaces and a sufficient chain mobility that is indispensable for chain diffusion across the interfaces and hydroxyl groups association to form H-bonds. No synthetic surfaces reported so far possess all the unique characteristics of the polymer thin films: intrinsic self-healing, long-term antifogging, excellent mechanical property, high transmittance and large-scale feasibility.

Show MeSH
Related in: MedlinePlus