Author:
Hill C.A.S.,Farahani M.R.M.,Hale M.D.C.
Abstract
Abstract
Corsican pine (Pinus nigra) sapwood was treated with
methanolic solutions of two organo alkoxysilanes ([γ-(methacryloxy)propylx] trimethoxy silane (TMPS), or vinyl
trimethoxy silane (VTMS)). Various treatment parameters
were studied in order to determine the optimum method
for obtaining a stable weight percentage gain. For TMPS,
it was found that best results were obtained when a free-radical
initiator was used in conjunction with the silane.
This indicates that polymerisation of this species occurs
via the pendant methacryloxy moeity, a result confirmed
by solid-state nuclear magnetic resonance studies of the
treated wood. For VTMS, wood moisture content had a
profound influence upon the weight percentage gain due
to treatment, with higher weight percentage gains
obtained as wood moisture content was increased. This
indicates that polymerisation in this case occurred via the
formation of silanol groups to form siloxane linkages.
Solid-state NMR confirmed that the double bond of the
organo-functional group was intact after polymerisation
had occurred. Modified wood samples were then prepared
using optimised treatments for each silane. The
wood was prepared to a variety of weight percentage
gains and the effect of treatment on the dimensional stability
and decay properties of the treated material studied.
Treatment of Corsican pine sapwood with the two
organo-alkoxy silanes, resulted in only moderate increases
in dimensional stabilisation, with anti shrink efficiency
values (after 5 water-soak/oven-dry cycles) no greater
than 40%. Treatments were found to be relatively stable
to hydrolysis. Some differences were observed in the
effectiveness of the two silanes in providing protection.
Full decay protection required high treatment levels with
the silanes.
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