Effect of TiO2 on UV stability of polymeric binder films used in waterborne facade paints

Kamil Wojciechowski , Grażyna Żukowska , Igor Koczargin , Przemysław Malanowski

Abstract

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.
Author Kamil Wojciechowski (FC / IBC / DM)
Kamil Wojciechowski,,
- Department Of Microbioanalytics
, Grażyna Żukowska (FC / CICSST)
Grażyna Żukowska,,
- Chair Of Inorganic Chemistry And Solid State Technology
, Igor Koczargin
Igor Koczargin,,
-
, Przemysław Malanowski
Przemysław Malanowski,,
-
Journal seriesProgress in Organic Coatings, ISSN 0300-9440, (A 40 pkt)
Issue year2015
Vol85
Pages123-130
Publication size in sheets0.5
Keywords in EnglishPhotodegradation; TiO2; Anatase; Rutile; Zeta potential; Paints
ASJC Classification2505 Materials Chemistry; 1605 Organic Chemistry; 2508 Surfaces, Coatings and Films; 1500 General Chemical Engineering
DOIDOI:10.1016/j.porgcoat.2015.04.002
URL http://www.sciencedirect.com.scopeesprx.elsevier.com/science/article/pii/S0300944015001071
Languageen angielski
File
1-s2.0-S0300944015001071-main.pdf 1.76 MB
Score (nominal)40
ScoreMinisterial score = 40.0, 05-09-2019, ArticleFromJournal
Ministerial score (2013-2016) = 40.0, 05-09-2019, ArticleFromJournal
Publication indicators Scopus SNIP (Source Normalised Impact per Paper): 2015 = 1.39; WoS Impact Factor: 2015 = 2.632 (2) - 2015=2.808 (5)
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