SYNTHESIS AND PROPERTIES OF PEROXY DERIVATES OF EPOXY RESINS BASED ON BISPHENOL A.
1. Effects of the Presence of Inorganic Bases
Michael Bratychak (1), Witold Brostow (2)
(1) Department of Petroleum Chemistry and Technology Lvivska Politechnika National
University, Stepana Bandery 12, 290646 Lviv, Ukraine
(2) Department of Materials Science,
University of North Texas, Denton, TX
76203-5310, USA
ABSTRACT
Oligomers containing peroxy groups have been synthesized from epoxies and aliphatic
and aromatic hydroperoxides. The dependence of reaction rates upon ratios of
starting materials, the presence of an inorganic base as a catalyst, nature of
solvent, quantity of water, and temperature have been investigated. The
hydroperoxide + epoxy reactions proceed very slowly in the presence of NaOH but at
satisfactory rates in the presence of KOH. The reactions do not proceed in acetone,
methylethylketone, dioxane, or toluene, but do procees in secondary and tertiary
alcohol media. We have studied in particular the reaction between tert-butyl-hydroperoxide (tBHPO),
diglycidyl ether of diphenylpropane and and epoxy resin based on Bisphenol A and
epichlorohydrin. Structures of the products were confirmed by IR and H-NMR spectroscopy.
Mechanisms of reactions have been defined and as empirical equation that describes kinetics of the
reaction between tBHPO and the epoxy have been developed. The peroxy oligomers so obtained were
used to create networks based on a polyesteric resin. Going from 10wt% of the peroxy oligomer
to 25% increases significantly the rate of gelation as well as the final gel weight fraction.
However, a further increase of the peroxy oligomer concentration to 50% affects only slightly
the gelation kinetics and the plateau gel fraction.
Maintained by Cathryn Karashin