Films of polystyrene (PS) were exposed to accelerated weathering in a Xenotest Alpha apparatus to mimic outdoor conditions (λ≥300 nm). The changes of the chemical structure in the films were studied by Fourier transform infrared spectroscopy (FT-IR) and the surface photo-oxidation by X-ray-photoelectron spectroscopy (XPS). The number of main-chain scissions and the changes in the molecular weight distribution were estimated by gel permeation chromatography (GPC). In particular, during the first stage of the photo-oxidation, the mechanical properties (stress at the breaking point (σb) and strain at the breaking point (εb)) of the PS films are strongly dependent on the degree of surface oxidation.
Chemical modifications, mechanical properties and surface photo-oxidation of films of polystyrene (PS)
Bottino, FA;Cinquegrani, AR;Di Pasquale, G;Leonardi, L;Pollicino, A
2004-01-01
Abstract
Films of polystyrene (PS) were exposed to accelerated weathering in a Xenotest Alpha apparatus to mimic outdoor conditions (λ≥300 nm). The changes of the chemical structure in the films were studied by Fourier transform infrared spectroscopy (FT-IR) and the surface photo-oxidation by X-ray-photoelectron spectroscopy (XPS). The number of main-chain scissions and the changes in the molecular weight distribution were estimated by gel permeation chromatography (GPC). In particular, during the first stage of the photo-oxidation, the mechanical properties (stress at the breaking point (σb) and strain at the breaking point (εb)) of the PS films are strongly dependent on the degree of surface oxidation.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
