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Publication type: Article in scientific journal
Type of review: Peer review (publication)
Title: A moisture-absorbing and abrasion resistant transparent coating on polystyrene
Authors : Grube, Svenja
Siegmann, Konstantin
Hirayama, Martina
DOI : 10.21256/zhaw-4136
Published in : Journal of Coatings Technology and Research
Volume(Issue) : 12
Issue : 4
Pages : 669
Pages to: 680
Issue Date: Jul-2015
Publisher / Ed. Institution : Springer
Publisher / Ed. Institution: New York
ISSN: 1945-9645
Language : English
Subjects : Anti-icing; Abrasion; Poly(1-vinyl-2-pyrrolidone); Swelling
Subject (DDC) : 540: Chemistry
Abstract: A common phenomenon concerning cold surfaces which are subjected to a warmer, more humid atmosphere is condensation in the form of water droplets (fogging) or even ice crystals (icing). Thus, a previously transparent object becomes opaque because light is scattered by the droplets or crystals. This may impair the usability of that object. We developed an anti-fogging/icing coating which overcomes the problem of fogging and icing by being able to absorb the condensing water and preventing it from crystallizing. The coating consists of poly(1-vinyl-2-pyrrolidone) (PVP) crosslinked by UV light using hydrogen peroxide (H2O2). Benzophenone (BP) is used to attach PVP to the surface of the polystyrene (PS) substrate. At temperatures as low as -60°C, the PVP coating can absorb up to 70 wt% of water and still inhibit its crystallization. However, at surface temperatures of around -18°C, opacity is only observable at 150 wt% of absorbed water and higher. An increasing coating thickness as well as a decreasing crosslink density improves the anti-fogging/icing effect because the coating can absorb more water. The abrasion resistance of the coating is impaired by a decreasing crosslink density.
Fulltext version : Published version
License (according to publishing contract) : CC BY-NC-ND 2.0: Attribution - Non commercial - No derivatives 2.0 Generic
Departement: School of Engineering
Organisational Unit: Institute of Materials and Process Engineering (IMPE)
Appears in Collections:Publikationen School of Engineering

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