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Cathodic delamination kinetics of thin polystyrene model coatings bound to zinc via organosilanes

Iqbal, Danish; Rechmann, Julian; Bashir, Ali; Sarfraz, Adnan; Altin, Abdulrahman; Erbe, Andreas
Journal article, Peer reviewed
Accepted version
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URI
http://hdl.handle.net/11250/2588805
Date
2018
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  • Publikasjoner fra CRIStin - NTNU [21058]
Original version
Materials and corrosion - Werkstoffe und Korrosion. 2018, 70 481-491.   10.1002/maco.201810395
Abstract
The cathodic delamination of poly(styrene) [PS] model coatings from oxidecovered

zinc has been evaluated by scanning Kelvin probe (SKP). Linear and

acrylate cross-linked PS model coatings covalently bound to zinc oxide via

Zn─O─Si bonds have been prepared. PS was prepared by thermally initiated free

radical polymerization in the presence of vinyltrimethoxy silane modified zinc.

Cross-linkers ethylene glycol diacrylate (EDA) and hexanediol diacrylate (HDA)

were used in some preparations. Resulting polymers are 8–15 nm thick. PS model

coatings show a delamination rate of only ≈20% of that of comparable

poly(methyl methacrylate) [PMMA] samples. The slower cathodic delamination

of PS is attributed to denser chain packing and higher amounts of hydrophobic

moieties, leading to a reduction in penetration of corrosive species. As opposed to

the situation in PMMA, the addition of HDA increases the delamination rate, due

to its flexible chains and hydrophilic groups. The lowest delamination rate is

observed in the presence of 25% EDA. Consequently, ester hydrolysis of acrylates

accelerates delamination, it is however not the main factor in cathodic

delamination of such thin model system.
Publisher
Wiley
Journal
Materials and corrosion - Werkstoffe und Korrosion

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