Analysis of Poly(2-Hydroxyethyl Methacrylate)-co- Poly(4-Vinyl Pyridine) Copolymers [COP2,4] Irradiated: an EPR study

Y. Ceylan a, H. Yumurtaci Aydogmus b, K. Usta c, A. Usta d, N. Ceylan e and H. Yilmaz f aSelcuk University, Department of Physics, Konya, Turkey bAlanya Alaaddin Keykubat University, Department of Industrial Engineering, Antalya, Turkey cAlanya Alaaddin Keykubat University, Department of Metallurgical and Materials Engineering, Antalya, Turkey dAlanya Alaaddin Keykubat University, Department of Mechanical Engineering, Antalya, Turkey eGiresun University, Department of Chemistry, Giresun, Turkey fGazi University, Department of Chemistry, Polatli-Ankara, Turkey

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Poly(2-hydroxyethyl methacrylate)-co-poly(4-vinyl pyridine) and poly(HEMA)-co-poly-(4-VP) copolymers were synthesized by free radical polymerization. K2S2O8 was used as an initiator. Chain lengths of the copolymer was changed by varying the monomer/initiator ratio. These polymers have molarites of 2.6 and 2.1 respectively and are called COP2 and COP4. The samples were exposed to gamma rays at room temperature. After irradiation, the EPR spectra of COP2 and COP4 were recorded between 120 K and 450 K. From the temperature dependence of the line intensity, it was concluded that unpaired spin concentration in the irradiated samples has been changing with temperature. A theoretical study, presented in this report, was aimed to test success of the machine learning methods and to select the best learning method.

DOI: 10.12693/APhysPolA.130.167 PACS numbers: 87.66.Uv, 36.20.Kd, 39.30.+w, 33.35.+r