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Please use this identifier to cite or link to this item: http://hdl.handle.net/123456789/11222

Title: Glue-line durability of organo-chemical/urea formaldehyde resin joints of Ceiba pentandra (L.) Gaertn. plywood
Authors: Antwi-Boasiako, C.
Appiah, J. K.
Keywords: Adherend
Bark extract
Bond/glue-line stability
De-lamination Organo-chemical resin UF-adhesive mixture
Issue Date: 2016
Publisher: J Indian Acad Wood Sci
Citation: J Indian Acad Wood Sci,2016; DOI 10.1007/s13196-017-0187-9
Abstract: Ceiba pentandra, a non-durable hardwood, is greatly patronized for plywood production. Urea– Formaldehyde (UF) adhesive-joints of plies are filled with toxic preservative-chemicals to extend their service-lives. These pose environmental anxieties. The strengths of C. pentandra ply glue-lines containing different concentrations of Erythrophleum suaveolens bark-extract/UF- and Fossect 88/UF-adhesives were compared. Controls comprised plies without preservative-chemicals at glue-joints. Bonds from dry-pressed plies were stronger (85.91 ± 3.80% for 3% E. suaveolens extract to 93.54 ± 3.79% for 2% extract) than the cold-pressed (68.51 ± 2.57 [1% extract]–84.53 ± 1.14% [2% extract]). Thus, 2% bark extract-UF bonds were the strongest. Glue-joints weakened after field exposure. However, the dry-treated ply bonds were equally more durable (29.55 ± 1.33 [Control]– 62.84 ± 1.52% [Fossect 88]) than their respective coldpressed ply-joints (22.99 ± 2.58–47.55 ± 1.55%). Steady decrease in bond strength occurred with prolonged outdoor exposure spanning 24 weeks. Visual durability rating for the entire plywood boards was in this decreasing order: Control (4) [1% extract (3) [2%, 3% extract and Fossect 88 (2), while that for the mass loss was: Control (46.79 ± 2.86%) [3% extract (7.80 ± 2.06%) [2% extract (10.98 ± 2.04%) [1% extract (13.10 ± 2.99%) [Fossect 88 (5.71 ± 1.15%). Industrially, organic preservatives (e.g. E. suaveolens bark extract) could substitute the conventional types in laminate glue-joints to reduce production costs and address ecological concerns without compromising bond performance.
Description: An article published by J Indian Acad Wood Sci,2016; DOI 10.1007/s13196-017-0187-9
URI: http://hdl.handle.net/123456789/11222
Appears in Collections:College of Agric and Natural Resources

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