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New method to determine the hydroxyl value in liquefied bark as Polyurethane material
Journal of Wood Science volume 48, pages 348–351 (2002)
Conclusions
When the hydroxyl values of materials containing phenolic 3 or sterically hindered hydroxyl groups were determined by the esterification method, the values were considerably smaller than the theoretical values. In contrast, the NCO method provided hydroxyl values much closer to the theoretical values for such materials, though the values varied depending on the kinds and amounts of catalysts.
The quantity of hydroxyl groups reacting with the NCO group could be directly determined by the NCO method using a catalyst mixture consisting of DABCO and DBTDL in a molar ratio of 2∶1. Therefore, this method can be considered useful for determining the hydroxyl value before preparing polyurethane from liquefied wood or bark.
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Ueno, T., Ashitani, T. & Sakai, K. New method to determine the hydroxyl value in liquefied bark as Polyurethane material. J Wood Sci 48, 348–351 (2002). https://doi.org/10.1007/BF00831360
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DOI: https://doi.org/10.1007/BF00831360