Abstract
A series of polyesters containing °-unsaturated carbonyl group in the main chain was synthesized from 1,3-bis(4-hydroxyphenyl)propenone and 3-(4-hydroxy-3-methoxyphenyl)-1-(4-hydroxyphenyl)propenone with various aliphatic and aromatic acid chlorides by an interfacial polycondensation method using a phase transfer catalyst. The structure of the synthesized monomers and polyesters was confirmed by IR, 1H NMR, 13C NMR and UV spectroscopy. These polyesters were studied for their thermal and photochemical properties. The thermal properties of polyesters were evaluated by thermogravimetric analysis and differential scanning calorimetry. The polyesters synthesized from aromatic acid chlorides have shown higher thermal stability than the polyesters from aliphatic acid chlorides. Moreover, the results revealed that the polyesters bearing methoxy substituent on the phenyl ring group possess lower thermal stability than non-substituted polyesters. The photoreactive property of the polyesters was studied by UV and IR spectrophotometer. It is observed that on exposure to UV light the polymers undergo photocrosslinking reaction. The photocrosslinking proceeds through the dimerization of olefinic chromophore via 2 + 2 cycloaddition reaction.
Published Version
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