DIMENSIONAL STABILIZATION OF RUBBERWOOD (<em>HEVEA</em> <em>BRASILIENSIS</em>) WITH ACETIC OR HEXANOIC ANHYDRIDE

Authors

  • C. A. S. Hill

Keywords:

Modification, volumetric swelling/shrinkage, anti-shrink efficiency, hexanoylation, acetylation

Abstract

SITI RAFIDAH, K., HILL, C. A. S. & ORMONDROYD, G. A. 2006. Dimensional stabilization of rubberwood
(Hevea brasiliensis) with acetic or hexanoic anhydride. The dimensional stability of rubberwood (Hevea
brasiliensis) modified with acetic or hexanoic anhydride was determined by the water-soak/oven-drying
method. Acetylation was more effective at providing dimensional stability compared with hexanoylation
below a weight percentage gain (WPG) of 10%. This was attributed to the different modification methods
used with the two anhydrides. Volumetric swelling (oven-dry) due to modification was lower for acetylation
compared with hexanoylation at comparable WPGs. Data were plotted in terms of anti-shrink efficiency
(ASE) against a parameter ASE’. ASE’ measures the ASE in terms of the sum of volume change due to
modification and water soaking. A negative ASE’ was found for hexanoylated rubberwood. This was attributed
to over-swelling of the cell wall at WPGs in excess of 25%. The swelling was due to reaction of the wood with
pyridine, which is known to be very effective at swelling the cell wall. Positive values of ASE’ were found for
acetylated rubberwood, but there was no clear relationship between ASE’ and WPG. Although positive
values of ASE’ can be attributed to cross-linking occurring within the cell wall, this cannot be assumed,
since changes in wood volume, as determined from external dimensions did not correlate with changes in
cell wall volume.

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Published

2022-06-23

How to Cite

C. A. S. Hill. (2022). DIMENSIONAL STABILIZATION OF RUBBERWOOD (<em>HEVEA</em> <em>BRASILIENSIS</em>) WITH ACETIC OR HEXANOIC ANHYDRIDE. Journal of Tropical Forest Science (JTFS), 18(4), 261–268. Retrieved from https://jtfs.frim.gov.my/jtfs/article/view/721

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