Effect of TiO2 on UV stability of polymeric binder films used in waterborne facade paints
PBN-AR
Instytucja
Wydział Chemiczny (Politechnika Warszawska)
Informacje podstawowe
Główny język publikacji
en
Czasopismo
Progress in Organic Coatings
ISSN
0300-9440
EISSN
Wydawca
DOI
URL
Rok publikacji
2015
Numer zeszytu
Strony od-do
123-130
Numer tomu
85
Identyfikator DOI
Liczba arkuszy
0.5
Autorzy
Pozostali autorzy
+ 2
Słowa kluczowe
en
Photodegradation; TiO2; Anatase; Rutile; Zeta potential; Paints
Streszczenia
Język
en
Treść
The effect of two TiO2 polymorphs with different optical activity (rutile and anatase) on UV-stability of four polymeric binders used in water-borne paints is described. The latexes employed in this study are based on acrylic, styrene–acrylic, vinyl acetate and vinyl acetate–butyl acrylate (co)polymers. Thin films obtained from the respective latexes doped with 1% TiO2 were exposed to accelerated weathering by irradiation with UV light (λ ≥ 275 nm) and analysed using electrokinetic potential (ζ-potential), FTIR ATR spectroscopy, SEM microscopy and contact angle. The study shows that while rutile particles dispersed evenly in all the polymer matrices, the anatase remained partly aggregated. Despite markedly different optical properties, both titania polymorphs showed similar and minor effects on accelerated weathering of all the polymeric binders. The trends in surface charge and wettability remained the same as for the undoped films. More pronounced changes were observed in spectroscopic measurements, which probe the films deeper into the bulk. For the styrene-based films a photochemical interaction between TiO2 and the styrene chromophore resulted in quenching the absorption band of the titania's photogenerated surface-trapped holes.
Inne
System-identifier
WUTfb5ec6fd0b884c6397c80b8e2f7907e6
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