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TiO 2 pigment structure and kinetics of PVC weathering
Author(s) -
Gesenhues Ulrich,
Hocken Jörg
Publication year - 2000
Publication title -
journal of vinyl and additive technology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.295
H-Index - 35
eISSN - 1548-0585
pISSN - 1083-5601
DOI - 10.1002/vnl.10228
Subject(s) - gloss (optics) , materials science , kinetics , weathering , pigment , vinyl chloride , chemical engineering , photodegradation , composite material , stabilizer (aeronautics) , irradiation , polymer chemistry , chemistry , photocatalysis , organic chemistry , coating , polymer , copolymer , catalysis , nuclear physics , mechanical engineering , physics , quantum mechanics , geomorphology , engineering , geology
The influences of doping the core of TiO 2 pigments with Al 2 O 3 and of various inorganic surface modifications on the rate of poly(vinyl chloride) (PVC) weathering are investigated. The kinetics of loss of gloss are transformed into photooxidation rates by using Weibull statistics of failure, and a scheme of two consecutive reactions is fitted to the intermediate losses of brightness observed for the most photoactive pigments. When Ca/Zn stabilizers in PVC are exchanged for Pb stabilizers, gloss degradation rate doubles, and the energetic spread of irradiation defects broadens. No indications for specific interactions between pigment and stabilizer are found.