Sh. Botros et Ma. Abdelghaffar, EFFICIENCY OF MODIFIED PHTHALOCYANINE COMPOUNDS AS ANTIOXIDANTS AND UV STABILIZERS FOR SBR VULCANIZATES, Journal of elastomers and plastics, 29(3), 1997, pp. 216-238
Modified phthalocyanine compounds were prepared from the condensation
of 3, 4, 9, 10 perylene tetracarboxylic acid dianhydride, phthalic anh
ydride and urea with and without chloride salts of Fe II, Co II, and N
i II, under phthalocyanine preparation conditions by the urea fusion t
echnique. The highly coloured metal free-, Fe-, Co-, and Ni-modified p
hthalocyanine compounds were incorporated into styrene-butadiene rubbe
r (SBR) mixes. The rheometric characteristics of the rubber mixes were
determined. The physicomechanical properties of SBR vulcanizates were
evaluated with and without exposure to thermal ageing, The obtained r
esults revealed that Ni-modified phthalocyanine has superior efficienc
y as an antioxidant for SBR vulcanizates, and 1 phr of that compound i
s the optimum concentration. UV exposed SBR vulcanizates showed that n
ickel-modified phthalocyanine is a good UV stabilizer and 2 phr is the
optimum concentration that can be significantly used in SBR. All samp
les subjected to UV radiation showed no significant change of colour u
p to 300 hrs of exposure.