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Cure kinetics of aqueous phenol–formaldehyde resins used for oriented strandboard manufacturing: Effect of zinc borate
Author(s) -
Lei Yong,
Wu Qinglin
Publication year - 2006
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.24528
Subject(s) - curing (chemistry) , formaldehyde , order of reaction , autocatalysis , zinc borate , differential scanning calorimetry , materials science , condensation polymer , chemical kinetics , reaction mechanism , polymer chemistry , kinetics , reaction rate , condensation reaction , activation energy , chemistry , composite material , polymer , catalysis , organic chemistry , reaction rate constant , thermodynamics , physics , fire retardant , quantum mechanics
The effect of zinc borate (ZB) on the cure kinetics of commercial phenol–formaldehyde oriented strandboard adhesives was studied using differential scanning calorimetry. ZB caused a separation of the addition and condensation reactions for both face and core resin (CR) systems with lowered cure temperature for the addition reaction. For the face resin, ZB did not change its n th‐order curing mechanism, but retarded the whole cure reactions, and increased the reaction order and the activation energy. Compared with neat CR, the addition reaction of the CR/ZB mixture, which occurred at temperatures lower than 60°C, also followed an n th‐order reaction mechanism. The condensation reaction of the mixture was changed from an autocatalytic reaction to an n th‐order one with the reaction order of about 1. The proposed models fitted the experimental data well. Relationships among cure reaction conversion (i.e., cure degree), cure temperature, and cure time were predicted for various resin/ZB systems. © 2006 Wiley Periodicals, Inc. J Appl Polym Sci 101: 3886–3894, 2006