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Improved adhesion of TiO 2 ‐based multilayer coating on HDPE and characterization of photocatalysis
Author(s) -
Kasanen Jussi,
Suvanto Mika,
Pakkanen Tuula T.
Publication year - 2010
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.32948
Subject(s) - palmitic acid , coating , materials science , photocatalysis , chemical engineering , high density polyethylene , substrate (aquarium) , fourier transform infrared spectroscopy , adhesion , catalysis , polyethylene , composite material , chemistry , organic chemistry , fatty acid , oceanography , engineering , geology
Multilayered photocatalytic TiO 2 ‐based coating was prepared by spin coating on a high‐density polyethylene (HDPE) substrate. The multilayered coating consisted of a polyurethane (PU) barrier layer and two layers of TiO 2 nanoparticles bound with PU. The adhesion between the HDPE substrate and protective PU coating was enhanced by oxygen plasma treatment of the substrate. The improved adhesion contributed to the photocatalytic degradation of palmitic acid. Long‐term activity of the photocatalytic coating in degradation of palmitic acid under UV illumination was followed by FTIR‐ATR. The catalytic activity of the coating was maintained in three identical cycles where palmitic acid was added and UV‐irradiated for 6 h. According to FTIR measurements, the palmitic acid was almost completely decomposed after 6 h, but gas chromatography (GC) analysis showed total decomposition to require 12 h UV illumination (∼ 97% of palmitic acid decomposed in 12 h). Study of the degradation of palmitic acid by GC as a function of time indicated that the degradation kinetics was pseudofirst order, and the rate constant obtained was 0.31 h −1 . © 2010 Wiley Periodicals, Inc. J Appl Polym Sci, 2011