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Improvement of white pinewood properties by impregnation with thiourea–formaldehyde resin and orthophosphoric acid
Author(s) -
Mahmoud A. A.,
Eissa A. M. F.,
Omar M. S.,
ElSawy A. A.,
Shaaban A. F.
Publication year - 2000
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/(sici)1097-4628(20000711)77:2<390::aid-app16>3.0.co;2-c
Subject(s) - formaldehyde , thiourea , aqueous solution , nuclear chemistry , materials science , chemistry , polymer chemistry , composite material , organic chemistry
White pinewood was impregnated with thiourea–formaldehyde (TUF) resin and orthophosphoric acid (OPA) as a crosslinking agent. The best weight gains (55–138%) were obtained after impregnation with an aqueous solution of TUF resin for 1 h and impregnation with aqueous solutions of OPA at different concentrations for 1 h. Water uptake of treated wood was found to be 23% after a water‐soaking test of 168 h, and a maximum antiswell efficiency was found to be 18% for a 85% OPA solution. Compression strength of the treated wood also improved with the highest value 62 KN/m 2 for wood treated with a 70% OPA solution versus a value of 40 KN/m 2 for untreated samples. Fire retardancy of the treated wood samples was also improved based on concentration of OPA. © 2000 John Wiley & Sons, Inc. J Appl Polym Sci 77: 390–397, 2000