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Hydrophobic recovery of atmospheric pressure plasma treated surfaces of Wood-Polymer Composites (WPC)

 
: Hünnekens, B.; Krause, A.; Militz, H.; Viöl, W.

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European journal of wood and wood products 75 (2017), Nr.5, S.761-766
ISSN: 0018-3768
ISSN: 1436-736X
Englisch
Zeitschriftenaufsatz
Fraunhofer IST ()

Abstract
In this study, the behavior of atmospheric pressure plasma treated surfaces of Wood-Polymer Composites (WPC) was investigated as a function of time and environmental conditions. The surfaces of injection molded WPC based on polypropylene (PP) and polyethylene (PE) were treated by a dielectric barrier discharge (DBD) and subsequently aged under various conditions. The wettability as an indicator for change of the composite surface was assessed using water contact angle. In addition, a calculation for half-time of the contact angles was developed to predict the time span which is needed for recovery of hydrophobicity. The results showed a major influence of temperature and time, whereas the humidity only at storing conditions of 60 °C and 75% relative humidity showed a distinct effect on the activated surface. The effect of DBD treatment was stable for more than one week in the climates 20 °C and 0% RH and 20 °C and 65% RH.

: http://publica.fraunhofer.de/dokumente/N-466987.html