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Determination of the gel point of formaldehyde-based wood adhesives by using a multiwave technique

  • Determining the instant of gelation of formaldehyde-based wood adhesives as an assessment parameter for their curing rate is important for optimizing the curing behavior. Due to the stoichiometrically imbalanced networks of formaldehyde-based adhesives, the crossover point of storage G′ and loss modulus G″ cannot unconditionally be assumed as the gel point in oscillatory time sweeps as the material response is frequency-dependent. This study aims to determine the gel point of selected adhesives by the isothermal multiwave oscillatory shear test. A thorough comparison between the gel and the crossover point of G′ and G″ is performed. Rheokinetic analysis showed no significant difference between the activation energies calculated at the gel point determined by a multiwave test and the crossover point obtained by the time sweep test. Hence, for resins with similar curing reactions, a reliable determination of gel point by applying a multiwave test is needed for a comparison of their reactivity.

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Author of HS ReutlingenKandelbauer, Andreas
Erschienen in:ACS applied polymer materials
Publisher:American Chemical Society
Place of publication:Washington, DC
Document Type:Journal article
Publication year:2023
Tag:activation energy; crossover point; gel point; kinetics; multiwave test; stoichiometrically balanced
Page Number:10
First Page:6354
Last Page:6363
PPN:Im Katalog der Hochschule Reutlingen ansehen
DDC classes:540 Chemie
Open access?:Ja
Licence (German):License Logo  Creative Commons - CC BY - Namensnennung 4.0 International