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The effect of copper ions on the structure of radicals generated in methacrylic polymers after UV irradiation – study using EPR spectroscopy

Alina Zalewska

Abstract

UV-radiation leads to the degradation of polymers and this may result in deterioration or loss of their physicochemical properties. The process of photodegradation may be affected by various kinds of additional components, such as the transition metal ions, contained in the polymer matrix and modifying its molecular structure. In this paper the effect of copper ions on the degradative changes in methacrylic polymer after UV-irradiation is considered. In experiments commercially available hydrogel materials based on methacrylic acid and/or its derivatives are used: Alphafilcon A, Etafilcon A, Galyfilcon A, Hilafilcon A, Methafilcon A, Nelfilcon A, Ocufilcon D, Omafilcon A, Polymacon, Tetrafilcon A, Vasurfilcon A, Vifilcon A. The copper ions are introduced into the material by soaking in water solution. The cations have a strong tendency to form complexes with ionic polymers containing carboxylic acid units. The mechanism of radical initiated by UV radiation is different in the presence of copper ions and this is confirmed by registered spectrum of electron paramagnetic resonance. The specific type of methacrylic radicals are mainly produced and it is accompanied by irreversible transformation of paramagnetic Cu2+ ions in their diamagnetic states. The amount of radicals depends on the number of ions introduced into the polymer matrix, and important role in the process of their formation play groups which are linked with metal ions.
Record ID
UAM0e142a69221c4b7791488d2177f7598b
Diploma type
Doctor of Philosophy
Author
Title in Polish
Badanie metodą EPR wpływu jonów miedzi na strukturę rodników w napromienionych UV polimerach metakrylowych
Title in English
The effect of copper ions on the structure of radicals generated in methacrylic polymers after UV irradiation – study using EPR spectroscopy
Language
pol (pl) Polish
Certifying Unit
Faculty of Physics (SNŚ/WyF/FoP)
Discipline
physics / (physical sciences domain) / (physical sciences)
Scientific discipline (2.0)
6.6 physical sciences
Status
Finished
Defense Date
25-11-2015
Title date
25-11-2015
Supervisor
URL
http://hdl.handle.net/10593/14041 Opening in a new tab
Keywords in English
electron paramagnetic resonance (EPR), copper ions, UV radiation, methacrylic polymers, photodegradation
Abstract in English
UV-radiation leads to the degradation of polymers and this may result in deterioration or loss of their physicochemical properties. The process of photodegradation may be affected by various kinds of additional components, such as the transition metal ions, contained in the polymer matrix and modifying its molecular structure. In this paper the effect of copper ions on the degradative changes in methacrylic polymer after UV-irradiation is considered. In experiments commercially available hydrogel materials based on methacrylic acid and/or its derivatives are used: Alphafilcon A, Etafilcon A, Galyfilcon A, Hilafilcon A, Methafilcon A, Nelfilcon A, Ocufilcon D, Omafilcon A, Polymacon, Tetrafilcon A, Vasurfilcon A, Vifilcon A. The copper ions are introduced into the material by soaking in water solution. The cations have a strong tendency to form complexes with ionic polymers containing carboxylic acid units. The mechanism of radical initiated by UV radiation is different in the presence of copper ions and this is confirmed by registered spectrum of electron paramagnetic resonance. The specific type of methacrylic radicals are mainly produced and it is accompanied by irreversible transformation of paramagnetic Cu2+ ions in their diamagnetic states. The amount of radicals depends on the number of ions introduced into the polymer matrix, and important role in the process of their formation play groups which are linked with metal ions.
Thesis file
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Uniform Resource Identifier
https://researchportal.amu.edu.pl/info/phd/UAM0e142a69221c4b7791488d2177f7598b/
URN
urn:amu-prod:UAM0e142a69221c4b7791488d2177f7598b

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