The Activation of Wood Fibre for Thermoplastic Coupling, the Reaction of Wood With a Potential Coupling Agent
- 1 November 1995
- journal article
- research article
- Published by Taylor & Francis in Journal of Wood Chemistry and Technology
- Vol. 15 (4), 529-544
- https://doi.org/10.1080/02773819508009524
Abstract
The reaction of pinus sylvestris with an unsaturated aliphatic isocyanate, TMI, was studied. Using six different solvent/swelling systems, the weight percent gains (WPG) of solid wood blocks was investigated. TMI was found to react readily with wood & WPG's of up to 74% were recorded. The modification of the wood improved the dimensional stability, with high anti shrink efficiency (ASE) values up to 90% and low weight losses recorded over two 7 day water soak cycles. This evidence strongly suggests modification of cell wall polymers. The reacted blocks were characterised by FT-IR and the spectra showed good evidence of a reaction between the -NCO and wood -OH with the introduction of a carbonyl group at 1710 – 1720 cm−1. There was no evidence of polymerisation of TMI, indeed the spectra indicated the continued presence of C = C, possibly 1,1 disubstituted ethylene functionality. The activation energy of the reaction was determined by measuring the WPG at 4 temperatures. This was found to be 54 kJ/mol., comparable to that of butyl -NCO with wood.Keywords
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