期刊Electron beam induced modification of poly(ethylene terephthalate) films.pdfVIP

Applied Surface Science 252 (2006) 8768–8775 /locate/apsusc Electron beam induced modification of poly(ethylene terephthalate) films I.V. Vasiljeva a,*, S.V. Mjakin a, A.V. Makarov b, A.N. Krasovsky b, A.V. Varlamov b a Technology Center RADIANT, 10, Kurchatova Str.,194223 St.-Petersburg, Russia b St.-Petersburg State University of Cinema and Television, 13, ul. Pravdy, 191126 St.-Petersburg, Russia Received 2 February 2006; received in revised form 17 March 2006; accepted 23 March 2006 Available online 2 May 2006 Abstract Electron beam processing of poly(ethylene terephthalate) (PET) films is found to promote significant changes in the melting heat, intrinsic viscosity and polymer film–liquid (water, isooctane and toluene) boundary surface tension. These properties are featured with several maximums depending on the absorbed dose and correlating with the modification of PET surface functionality. Studies using adsorption of acid–base indicators and IR-spectroscopy revealed that the increase of PET surface hydrophilicity is determined by the oxidation of methylene and methyne groups. Electron beam treatment of PET films on the surface of N-vinylpyrrolidone aqueous solution provided graft copolymerization with this comonomer at optimum process parameters (energy 700 keV, current 1 mA, absorbed dose 50 kGy). # 2006 Elsevier B.V. All rights reserved. Keywords: Poly(ethylene terephthalate); Electron beam processing; Surface modification; Graft copolymerization; N-Vinylpyrrolidone 1. Introduction of various chemically in