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- 2011 (2) (entfernen)
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- Englisch (2)
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- Humidity (1)
- LDPE (1)
- UV weathering (1)
Photo-oxidative ageing of polymers under defined exposure (UV, humidity) was investigated from two points of view: a) the ageing process Starts from the topmost surface and penetrates slowly towards bulk and b) radicals play an important role among ageing. Therefore, X-ray photoelectron (XPS) and electron spin resonance (ESR) spectroscopy were applied to show both, the progressive incorporation of oxygen during in-situ UV irradiation (XPS) and the formation of radicals (ESR) in the polymer. The intensity of ESR Signals served as measure for radical concentration. The Validation of this correlation was checked for polyethylenes (PE) equipped with different concentrations of Hostavin N30 UV stabilizer.
The outdoor weathering of polymers is mainly due to UV radiation, water, Pollution, humidity, temperature etc. To understand the effects of weathering, simulated tests need to be undertaken in lab scale. Such tests must be quite efficient and similar to the effects of natural weathering. This paper mainly focuses on the effects of UV radiation along with humidity on LDPE.