Thermal and Ablative Properties of Some Phenolic Resin Derivatives and Composites

S. Najim, Tariq

	Thermal and Ablative Properties of Some Phenolic Resin Derivatives and Composites
Al-Mustansiriyah Journal of Science
Article 1, Volume 21, Issue 5, 2010, Pages 310-318
Author
Tariq S. Najim
Abstract
Eleven phenolic Schiff bases were prepared previously by condensation reaction of p-hydroxy benzaldehyde or furfuryldehyde with p-aminophenol, p-phenelene diamine, 1,2- phenelene diamine ,4,5-dimethyl 1,2-phenelene diamine, p-dianilino methane , p-dianilino ether , hydrazine, ethylene diamine, benzidene and aniline.These phenolic Schiff bases were converted to phenol formaldehyde,resole type resin, by polycondensation with excess formaldehyde, which were characterized by I.R and thermal analysis. High ortho resole resin was also prepared previously by condensation of phenol with excess of formaldehyde in the presence of magnesium oxide as catalyst and characterized by infrared spectroscopy and thermogravemetric analysis. The thermal stability of the cured resins according to the 50% wt. loss was evaluated, and were in the following order XX > XIII, XII > XVI > XIX > XVII, XXI > XXII > XV > XXIII. The higher thermal stability is attributed to ladder structure which is expected to be formed in the cured resins as well as to the linear nitrogenous backbone structure and aromatic character. Composite samples were prepared by using chopped fiber glass type E as a reinforcing fiber impregnated with a polymeric matrix based on the above phenolic resin derivatives and high ortho resole resin. The ablative characteristics were investigated by subjecting the molded composite species to oxy- acetylene flame test according to ASTM E 285 - 80 .Most of the examined ablative samples showed good insulation properties in view of their low char rates and outstanding ablative indices.

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