Oligomer distribution at the gel point of tannin-resorcinol-formaldehyde cold-set wood adhesives

Pizzi A. ; Pasch H. ; Celzard A. ; Szczurek A. (2012)


Tannin-resorcinol-formaldehyde cold-set adhesives for wood laminating and fingerjointing were examined by Matrix Assisted Laser Desorption/Ionisation Time of Flight (MALDI-TOF) mass spectrometry. The analysis revealed that the adhesive was composed at the gel point of resorcinol-formaldehyde oligomers, unreacted flavonoids, and resorcinol-formaldehyde oligomers coreacted with flavonoid units of the tannin. The last ones constitute a high proportion of the adhesive resin. Furthermore, their proportion is highest at the minimum phenolic reactivity around pH 4. © 2012 Copyright Taylor and Francis Group, LLC.

Please refer to this item in SUNScholar by using the following persistent URL: http://hdl.handle.net/10019.1/21870
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