Cp. Gao et As. Hay, THERMALLY CROSS-LINKABLE POLY(ARYL ETHER)S CONTAINING A CHALCONE MOIETY, Journal of macromolecular science. Pure and applied chemistry, A33(2), 1996, pp. 157-171
High molecular weight poly(aryl ethe)s containing internal chalcone gr
oups have been synthesized from 4,4'-dihydroxychalcone and 1,3-bis(4-h
ydroxycinnamoyl)benzene by solution polycondensation with activated ar
omatic bishalides. Characterization of and crosslinking studies on the
se polymers were carried out utilizing DSC, TGA, GPC and NMR. The poly
mers can be thermally crosslinked when heated above 300 degrees C, and
the glass transition temperatures (T-g) of the polymers increase afte
r crosslinking. The resulting crosslinked networks are insoluble in al
l organic solvents tried. Thermogravimetric analysis shows that no sig
nificant weight loss accompanies the crosslinking reaction. These poly
mers can be converted into polypyrazolines by reaction with hydrazine
monohydrate.