Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels

In this study, polyacrylamide (PAAm) and poly(N-isopropylacrylamide) (PNIPAAm) hydrogels were synthesized via ultraviolet light-emitting diode (UV LED) (? ~ 365 nm) photopolymerization system. UV LED technology has offered better alternative than UV mercury (Hg) system for curing technology especial...

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Main Author:	Ayub, Nur Farizah
Format:	Thesis
Language:	English
Published:	2016
Subjects:	TP Chemical technology
Online Access:	http://eprints.utm.my/id/eprint/60709/1/NurFarizahAyubMFChE2016.pdf
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spelling	my-utm-ep.607092021-01-03T01:20:33Z Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels 2016-07 Ayub, Nur Farizah TP Chemical technology In this study, polyacrylamide (PAAm) and poly(N-isopropylacrylamide) (PNIPAAm) hydrogels were synthesized via ultraviolet light-emitting diode (UV LED) (? ~ 365 nm) photopolymerization system. UV LED technology has offered better alternative than UV mercury (Hg) system for curing technology especially for temperature-sensitive polymeric hydrogels as it can be operated without heat generation and with fast curing response. The control experiment using commercial photoinitiators has shown that UV LED system was suitable to polymerize hydrogels provided that; photoinitiator has the overlap emission with UV LED spectra. However, most commercial photoinitiators have limited solubility in water. Thus, suitable water soluble photoinitiator (WSPI) for UV LED system (i.e. ? ? 330-365 nm) was prepared in order to synthesize UV LED curable hydrogel in purely water formulation. The water soluble photoinitiator was obtained from complexation of 2,2-dimethoxy-2-phenylacetophenone (DMPA) and methylated-ß-cyclodextrin (MßCD). According to the results presented in this work, high monomer conversion (> 90 %) was achieved with WSPI-initiated hydrogels. The non-responsive and responsive behavior of PAAm and PNIPAAm hydrogels towards temperature were demonstrated by swelling and rheological measurements. In addition, swelling and rheological methods gave good correlation for determination of mesh sizes. From rheological measurements, the elastic modulus (G') was higher than the loss modulus (G?) and both parameters were independent to the measured frequency window. It has shown that UV LED cured hydrogels possessed ideal rubber characteristic. Tensile properties of the hydrogels showed similar trend curve as commercial contact lenses reported in the previous study. Clearly, this study has revealed that UV LED system is a good tool to synthesize hydrogels by using the excellent choice of photoiniator. 2016-07 Thesis http://eprints.utm.my/id/eprint/60709/ http://eprints.utm.my/id/eprint/60709/1/NurFarizahAyubMFChE2016.pdf application/pdf en public http://dms.library.utm.my:8080/vital/access/manager/Repository/vital:93938 masters Universiti Teknologi Malaysia, Faculty of Chemical Engineering Faculty of Chemical Engineering
institution	Universiti Teknologi Malaysia
collection	UTM Institutional Repository
language	English
topic	TP Chemical technology
spellingShingle	TP Chemical technology Ayub, Nur Farizah Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels
description	In this study, polyacrylamide (PAAm) and poly(N-isopropylacrylamide) (PNIPAAm) hydrogels were synthesized via ultraviolet light-emitting diode (UV LED) (? ~ 365 nm) photopolymerization system. UV LED technology has offered better alternative than UV mercury (Hg) system for curing technology especially for temperature-sensitive polymeric hydrogels as it can be operated without heat generation and with fast curing response. The control experiment using commercial photoinitiators has shown that UV LED system was suitable to polymerize hydrogels provided that; photoinitiator has the overlap emission with UV LED spectra. However, most commercial photoinitiators have limited solubility in water. Thus, suitable water soluble photoinitiator (WSPI) for UV LED system (i.e. ? ? 330-365 nm) was prepared in order to synthesize UV LED curable hydrogel in purely water formulation. The water soluble photoinitiator was obtained from complexation of 2,2-dimethoxy-2-phenylacetophenone (DMPA) and methylated-ß-cyclodextrin (MßCD). According to the results presented in this work, high monomer conversion (> 90 %) was achieved with WSPI-initiated hydrogels. The non-responsive and responsive behavior of PAAm and PNIPAAm hydrogels towards temperature were demonstrated by swelling and rheological measurements. In addition, swelling and rheological methods gave good correlation for determination of mesh sizes. From rheological measurements, the elastic modulus (G') was higher than the loss modulus (G?) and both parameters were independent to the measured frequency window. It has shown that UV LED cured hydrogels possessed ideal rubber characteristic. Tensile properties of the hydrogels showed similar trend curve as commercial contact lenses reported in the previous study. Clearly, this study has revealed that UV LED system is a good tool to synthesize hydrogels by using the excellent choice of photoiniator.
format	Thesis
qualification_level	Master's degree
author	Ayub, Nur Farizah
author_facet	Ayub, Nur Farizah
author_sort	Ayub, Nur Farizah
title	Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels
title_short	Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels
title_full	Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels
title_fullStr	Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels
title_full_unstemmed	Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels
title_sort	novel uv led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels
granting_institution	Universiti Teknologi Malaysia, Faculty of Chemical Engineering
granting_department	Faculty of Chemical Engineering
publishDate	2016
url	http://eprints.utm.my/id/eprint/60709/1/NurFarizahAyubMFChE2016.pdf
_version_	1747817764578394112

Novel UV led photopolymerization and characterization for polyacrylamide and poly (n-isopropylacrylamide) hydrogels

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