Rheological Behavior Of Urea-Formaldehyde Adhesive Resins

Christjanson, Peep; Suurpere, Aime; Siimer, Kadri

doi:10.1080/14328917.2005.11784866

Cited by 2 publications

(2 citation statements)

References 17 publications

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“…At GP, i.e., at the moment of gel formation, a certain percentage of reagents have reacted and a particular degree of conversion has been reached. The GP has been studied by several research groups to determine the effect of, e.g., different wood extractives, fillers, hardeners, , and also the storage stability of the wood adhesive on the crosslinking behavior and their kinetics.…”

Section: Introductionmentioning

confidence: 99%

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Determination of the Gel Point of Formaldehyde-Based Wood Adhesives by Using a Multiwave Technique

Nasseri,

Rosenfeld,

Solt

et al. 2023

ACS Appl. Polym. Mater.

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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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Section: Introductionmentioning

confidence: 99%

“…The complex curing reaction of UF resin makes the application of such theoretical studies very difficult. Hence, network formation and gelation of UF resins have been studied widely using different experimental methods. ,,− …”

Section: Introductionmentioning

confidence: 99%