Films of polystyrene (PS) were exposed to accelerated weathering in a Xenotest Alpha apparatus to mimic outdoor conditions (l300 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 (sb) and strain at the breaking point (eb)) of the PS films are strongly dependent on the degree of surface oxidation.
|Titolo:||Chemical Modifications, Mechanical Properties and Surface Photo-oxidation of Films of Polystyrene|
|Data di pubblicazione:||2004|
|Appare nelle tipologie:||1.1 Articolo in rivista|