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Wood-adhesive interactions in a PVAc latex

Wood-adhesive interactions in a PVAc latex Static rheological analysis based on time/temperature equivalence was applied to freestanding poly(vinyl acetate-co-N-methylolacrylamide) (PVAc-co-NMA) adhesive films and to wood-bonded films (composites) containing two types of crosslinking: 1) AlCl 3 catalysis of NMA comonomer, and 2) the same AlCl 3 catalysis plus additional crosslinking using a phenolic resol additive, PF. The glass/rubber relaxations for bulk poly(vinyl acetate), PVAc, and in some cases for the poly(vinyl alcohol) interfacial agent (PVOH) also, were evaluated by the empirical Kohlrausch-Williams-Watts (KWW) coupling model. The KWW coupling analysis revealed that accelerated weathering dramatically decreased PVAc segmental coupling in neat films; the PF additive slightly mitigated this weathering effect. In comparison to neat films, composite specimens exhibited increased PVAc coupling for all sample types, demonstrating a significant wood-adhesive interaction. In contrast to neat films, the PF additive completely negated the effects of accelerated weathering in composite specimens. Since PF prevented weathering-induced changes to the PVAc relaxation (in composites), the phenolic additive influenced the bulk adhesive and its effects were not restricted to PVOH crosslinking at the interparticle boundaries. The wood-adhesive interaction was not only detected through the PVAc relaxation but also in the PVOH glass transition. Furthermore, the PF borne weather resistance was dependent upon the presence or absence of wood, suggesting a PF/wood interaction. It is unknown if the putative PF/wood interaction is direct or possibly indirect through wood alteration of PVAc and PVOH. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Wood de Gruyter

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References (8)

Publisher
de Gruyter
Copyright
©2008 by Walter de Gruyter Berlin New York
Subject
Original Papers
ISSN
0018-3830
eISSN
1437-434X
DOI
10.1515/HF.2008.063
Publisher site
See Article on Publisher Site

Abstract

Static rheological analysis based on time/temperature equivalence was applied to freestanding poly(vinyl acetate-co-N-methylolacrylamide) (PVAc-co-NMA) adhesive films and to wood-bonded films (composites) containing two types of crosslinking: 1) AlCl 3 catalysis of NMA comonomer, and 2) the same AlCl 3 catalysis plus additional crosslinking using a phenolic resol additive, PF. The glass/rubber relaxations for bulk poly(vinyl acetate), PVAc, and in some cases for the poly(vinyl alcohol) interfacial agent (PVOH) also, were evaluated by the empirical Kohlrausch-Williams-Watts (KWW) coupling model. The KWW coupling analysis revealed that accelerated weathering dramatically decreased PVAc segmental coupling in neat films; the PF additive slightly mitigated this weathering effect. In comparison to neat films, composite specimens exhibited increased PVAc coupling for all sample types, demonstrating a significant wood-adhesive interaction. In contrast to neat films, the PF additive completely negated the effects of accelerated weathering in composite specimens. Since PF prevented weathering-induced changes to the PVAc relaxation (in composites), the phenolic additive influenced the bulk adhesive and its effects were not restricted to PVOH crosslinking at the interparticle boundaries. The wood-adhesive interaction was not only detected through the PVAc relaxation but also in the PVOH glass transition. Furthermore, the PF borne weather resistance was dependent upon the presence or absence of wood, suggesting a PF/wood interaction. It is unknown if the putative PF/wood interaction is direct or possibly indirect through wood alteration of PVAc and PVOH.

Journal

Holzforschung - International Journal of the Biology, Chemistry, Physics and Technology of Woodde Gruyter

Published: Jul 1, 2008

Keywords: Kohlrausch-Williams-Watts (KWW) segmental coupling; latex adhesives; parallel-plate rheology; wood-adhesive interactions

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