id	author	title	date	pages	extension	mime	words	sentence	flesch	summary	cache	txt
fis-2724	Kaddouri, Afaf; Serier, Boualem; Kaddouri, Khacem; Belhouari, Mohamed	Experimental Analysis of the Physical Degradation of Polymers – The Case of Polymethyl Methacrylate	2020	15	.pdf	application/pdf	9355	546	53	Surface modification and ageing of PMMA polymer by oxygen plasma treatment, Journal of vacuum. 6 (86), pp.634-637. The breaking of the macromolecular chain is responsible for the deterioration of PMMA properties; For longer ultraviolet radiation exposure times (beyond thirty-six months), the linear mechanical behavior of the non- irradiated PMMA changes to a non-linear behavior, with greater deformations as compared to the non-irradiated polymer; The modulus of Young of the PMMA drops sharply during the first six months of exposure to artificial (UV) lamp radiation then starts decreasing slowly during the following six months.	cache/fis-2724.pdf	txt/fis-2724.txt