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Dr. Mohamed Salah Omar :: Publications:

Title:
Improvement of White Pinewood Properties by Impregnation with Thiourea–Formaldehyde Resin and Orthophosphoric Acid
Authors: A. A. MAHMOUD, A. M. F. EISSA, M. S. OMAR, A. A. EL-SAWY, A. F. SHAABAN
Year: 2000
Keywords: Not Available
Journal: J Appl Polym Sci
Volume: 77
Issue: Not Available
Pages: 390–397
Publisher: © 2000 John Wiley & Sons, Inc.
Local/International: International
Paper Link: Not Available
Full paper Mohamed Salah Omar _Mahmoud_et_al-2000-Journal_of_Applied_Polymer_Science.pdf
Supplementary materials Not Available
Abstract:

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/m2 for wood treated with a 70% OPA solution versus a value of 40 KN/m2 for untreated samples. Fire retardancy of the treated wood samples was also improved based on concentration of OPA.

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