The formation of radicals on the surface of poly(ethylene naphthalate) (PEN) and poly(ethylene terephthalate) (PET) films after KrF excimer laser ablation was investigated by electron spin resonance (ESR) measurement and by surface immobilization reaction with an acrylic acid ester and a styrene derivative at a cryogenic temperature. The ESR spectrum of ablated PEN film in a sealed quartz tube shows a broad singlet-like peak.
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