Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity

Various reports demonstrated that azobenzene derivatives are the chromophore of choice in photoresponsive surfaces showing reversible surface polarity. Hitherto the surface study of coating films based on polymer/azobenzene blends using contact angle measurements remained unexplored. To provide insi...

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Main Authors: Hisham, Shameer, Muhamad Sarih, Norazilawati, Tajuddin, Hairul Anuar, Zainal Abidin, Zul Hazrin, Abdullah, Zanariah
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Published: Royal Society of Chemistry 2021
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Online Access:http://eprints.um.edu.my/28137/
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spelling my.um.eprints.281372022-07-27T04:49:13Z http://eprints.um.edu.my/28137/ Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity Hisham, Shameer Muhamad Sarih, Norazilawati Tajuddin, Hairul Anuar Zainal Abidin, Zul Hazrin Abdullah, Zanariah QD Chemistry Various reports demonstrated that azobenzene derivatives are the chromophore of choice in photoresponsive surfaces showing reversible surface polarity. Hitherto the surface study of coating films based on polymer/azobenzene blends using contact angle measurements remained unexplored. To provide insight into the surface polarity of polymer/dye blend films, poly(methyl methacrylate) (PMMA) blends containing photoresponsive 4-hydroxy-4 `-methylazobenzene (AZO1) and 4,4 `-dimethylazobenzene (AZO2) as coating films on clear glass substrates are investigated in this work. Contact angle measurements were carried out to unravel the role of substituents in the surface polarity and the orientation of chromophores in the coating matrices before and after UV light (lambda(max) = 365 nm) irradiation. Changes in water contact angles measured on the PMMA/azobenzene coating films indicated that the surface polarity is reversible as the chromophores underwent reversible trans-cis isomerisation. It has been revealed that the repeated trans-cis isomerisation led to the random reorientation and arrangement of chromophores in PMMA/AZO1 coating films. Then, to indicate the possibility of the disruption of interfacial interactions due to the repeated trans-cis isomerisation processes, as a proof of concept experiment, it is shown that the commercial acrylic-based pressure-sensitive sticker which adhered strongly to the PMMA/AZO1(13) coating film is peeled off from the coating surface after being subjected to a cycle of UV light irradiation for 12 hours, followed by dark conditions for another 12 hours within 14 days. The proof of concept study will lead to more development of smart photoresponsive coating films using simple polymer/dye blends. Royal Society of Chemistry 2021-05-04 Article PeerReviewed Hisham, Shameer and Muhamad Sarih, Norazilawati and Tajuddin, Hairul Anuar and Zainal Abidin, Zul Hazrin and Abdullah, Zanariah (2021) Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity. RSC Advances, 11 (25). pp. 15428-15437. ISSN 2046-2069, DOI https://doi.org/10.1039/d1ra01192h <https://doi.org/10.1039/d1ra01192h>. 10.1039/d1ra01192h
institution Universiti Malaya
building UM Library
collection Institutional Repository
continent Asia
country Malaysia
content_provider Universiti Malaya
content_source UM Research Repository
url_provider http://eprints.um.edu.my/
topic QD Chemistry
spellingShingle QD Chemistry
Hisham, Shameer
Muhamad Sarih, Norazilawati
Tajuddin, Hairul Anuar
Zainal Abidin, Zul Hazrin
Abdullah, Zanariah
Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity
description Various reports demonstrated that azobenzene derivatives are the chromophore of choice in photoresponsive surfaces showing reversible surface polarity. Hitherto the surface study of coating films based on polymer/azobenzene blends using contact angle measurements remained unexplored. To provide insight into the surface polarity of polymer/dye blend films, poly(methyl methacrylate) (PMMA) blends containing photoresponsive 4-hydroxy-4 `-methylazobenzene (AZO1) and 4,4 `-dimethylazobenzene (AZO2) as coating films on clear glass substrates are investigated in this work. Contact angle measurements were carried out to unravel the role of substituents in the surface polarity and the orientation of chromophores in the coating matrices before and after UV light (lambda(max) = 365 nm) irradiation. Changes in water contact angles measured on the PMMA/azobenzene coating films indicated that the surface polarity is reversible as the chromophores underwent reversible trans-cis isomerisation. It has been revealed that the repeated trans-cis isomerisation led to the random reorientation and arrangement of chromophores in PMMA/AZO1 coating films. Then, to indicate the possibility of the disruption of interfacial interactions due to the repeated trans-cis isomerisation processes, as a proof of concept experiment, it is shown that the commercial acrylic-based pressure-sensitive sticker which adhered strongly to the PMMA/AZO1(13) coating film is peeled off from the coating surface after being subjected to a cycle of UV light irradiation for 12 hours, followed by dark conditions for another 12 hours within 14 days. The proof of concept study will lead to more development of smart photoresponsive coating films using simple polymer/dye blends.
format Article
author Hisham, Shameer
Muhamad Sarih, Norazilawati
Tajuddin, Hairul Anuar
Zainal Abidin, Zul Hazrin
Abdullah, Zanariah
author_facet Hisham, Shameer
Muhamad Sarih, Norazilawati
Tajuddin, Hairul Anuar
Zainal Abidin, Zul Hazrin
Abdullah, Zanariah
author_sort Hisham, Shameer
title Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity
title_short Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity
title_full Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity
title_fullStr Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity
title_full_unstemmed Unraveling the surface properties of PMMA/azobenzene blends as coating films with photoreversible surface polarity
title_sort unraveling the surface properties of pmma/azobenzene blends as coating films with photoreversible surface polarity
publisher Royal Society of Chemistry
publishDate 2021
url http://eprints.um.edu.my/28137/
_version_ 1739828441397592064
score 13.222552