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	STUDIA PHYSICA - Issue no. 1 / 2011

	Article:	OBSERVATION OF THE EFFECTS OF UV EXPOSURE OF SOME PVA MEMBRANES. Authors: L. UDRESCU, C.V. POP, M. TODICA.


	Abstract: The effect of UV exposure on the Poly vinyl alcohol membranes was observed by UV VIS spectroscopy. After few hours of moderate UV exposure the absorption coefficient is modified. After few weeks of relaxation, after UV irradiation was stopped, a partially recovery of the amplitude of the absorption peak is observed. This behavior suggest a reversible process of rearrangement of polymeric segments after irradiation. Keywords: PVA, UV VIS spectroscopy, absorption properties.




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