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Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity

Illegal advertisement stickers still exist as a recurring problem, especially in urban areas. Removing them requires mechanical forces or chemicals, which often leads to residues remaining on walls and surfaces, causing damage and hideous appearance of surfaces. Moreover, repairing these surfaces re...

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Main Authors: Hisham, Shameer, Muhamad Sarih, Norazilawati, Tajuddin, Hairul Anuar, Zainal Abidin, Zul Hazrin
Format: Conference or Workshop Item
Language:English
Subjects:
QD Chemistry
Online Access:http://eprints.um.edu.my/45068/1/Dr.%20Shameer%20Hisham_ICPAC%20KK%20%20ISAPM%202022.pdf
http://eprints.um.edu.my/45068/
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spelling my.um.eprints.450682024-05-30T04:06:18Z http://eprints.um.edu.my/45068/ Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity Hisham, Shameer Muhamad Sarih, Norazilawati Tajuddin, Hairul Anuar Zainal Abidin, Zul Hazrin QD Chemistry Illegal advertisement stickers still exist as a recurring problem, especially in urban areas. Removing them requires mechanical forces or chemicals, which often leads to residues remaining on walls and surfaces, causing damage and hideous appearance of surfaces. Moreover, repairing these surfaces requires high costs. It is proposed that surfaces with reversible polarity, particularly from the additive component, can cause the surface to gradually reduce the interactions and any stickers can peel off by itself. Thus, we described the formulation and the application of poly(methyl methacrylate), PMMA blends containing photoresponsive dyes as smart coatings that were capable of photoreversibly switch surface polarities. The blends contained various azobenzene derivatives including an azobenzene end-functionalized PMMA additive (P1), which were then applied onto clear glass substrates as coating films. A proof-of-concept work showed that these PMMA/azobenzene coatings were able to remove stickers by itself due to the repetition of trans–cis isomerization of azo dyes in the coating upon UV-A irradiation, resulting in a considerable alteration to the sticker/coating interactions1. It was discovered that thermal annealing of PMMA/P1 coating film above the glass transition temperature, Tg allowed the segregation of P1 macromolecules to the surface, resulting in enhanced changes in the surface polarity. In addition, the annealed PMMA/P1 coating film has shown better performance in the sticker peel-off test compared to that of the unannealed coating film. These fundamental discoveries would lead to more development of smart coatings based on simple PMMA/azobenzene blends, where they can be used as a prospective solution to retard problems associated with commercial stickers. Conference or Workshop Item NonPeerReviewed text en http://eprints.um.edu.my/45068/1/Dr.%20Shameer%20Hisham_ICPAC%20KK%20%20ISAPM%202022.pdf Hisham, Shameer and Muhamad Sarih, Norazilawati and Tajuddin, Hairul Anuar and Zainal Abidin, Zul Hazrin Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity. In: International Congress on Pure & Applied Chemistry, 22 - 27 November 2022, Kota Kinabalu, Sabah, Malaysia. (Unpublished)
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/
language English
topic QD Chemistry
spellingShingle QD Chemistry
Hisham, Shameer
Muhamad Sarih, Norazilawati
Tajuddin, Hairul Anuar
Zainal Abidin, Zul Hazrin
Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity
description Illegal advertisement stickers still exist as a recurring problem, especially in urban areas. Removing them requires mechanical forces or chemicals, which often leads to residues remaining on walls and surfaces, causing damage and hideous appearance of surfaces. Moreover, repairing these surfaces requires high costs. It is proposed that surfaces with reversible polarity, particularly from the additive component, can cause the surface to gradually reduce the interactions and any stickers can peel off by itself. Thus, we described the formulation and the application of poly(methyl methacrylate), PMMA blends containing photoresponsive dyes as smart coatings that were capable of photoreversibly switch surface polarities. The blends contained various azobenzene derivatives including an azobenzene end-functionalized PMMA additive (P1), which were then applied onto clear glass substrates as coating films. A proof-of-concept work showed that these PMMA/azobenzene coatings were able to remove stickers by itself due to the repetition of trans–cis isomerization of azo dyes in the coating upon UV-A irradiation, resulting in a considerable alteration to the sticker/coating interactions1. It was discovered that thermal annealing of PMMA/P1 coating film above the glass transition temperature, Tg allowed the segregation of P1 macromolecules to the surface, resulting in enhanced changes in the surface polarity. In addition, the annealed PMMA/P1 coating film has shown better performance in the sticker peel-off test compared to that of the unannealed coating film. These fundamental discoveries would lead to more development of smart coatings based on simple PMMA/azobenzene blends, where they can be used as a prospective solution to retard problems associated with commercial stickers.
format Conference or Workshop Item
author Hisham, Shameer
Muhamad Sarih, Norazilawati
Tajuddin, Hairul Anuar
Zainal Abidin, Zul Hazrin
author_facet Hisham, Shameer
Muhamad Sarih, Norazilawati
Tajuddin, Hairul Anuar
Zainal Abidin, Zul Hazrin
author_sort Hisham, Shameer
title Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity
title_short Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity
title_full Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity
title_fullStr Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity
title_full_unstemmed Photoresponsive azobenzene-containing PMMA as smart coatings with reversible surface polarity
title_sort photoresponsive azobenzene-containing pmma as smart coatings with reversible surface polarity
url http://eprints.um.edu.my/45068/1/Dr.%20Shameer%20Hisham_ICPAC%20KK%20%20ISAPM%202022.pdf
http://eprints.um.edu.my/45068/
_version_ 1800715028062535680
score 13.211869

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