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Calculation of the efficiency of ultraviolet screeners in plastics
Author(s) -
Pickett James E.
Publication year - 1987
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1987.070330220
Subject(s) - photodegradation , polymer , degradation (telecommunications) , molar absorptivity , materials science , absorption (acoustics) , ultraviolet , photochemistry , layer (electronics) , composite material , optics , chemical engineering , chemistry , optoelectronics , organic chemistry , catalysis , photocatalysis , telecommunications , physics , computer science , engineering
Calculation of the effect of light absorbers (UV screeners) on the photochemistry of polymers shows that a critical factor in reducing the rate of photodegradation is the thickness of the actual degraded layer. When the degradation is confined to a zone within a few microns of the exposed surface, the efficiency of light absorption as a stabilization mechanism is greatly reduced. The relative absorptivity of the base resin and pigment loadings are calculated to have a minor effect on stabilization efficiency for polymers having thin layers of degradation.