Polycondensates of 2′‐(Chalcone‐4‐Oxy)Ethyl‐3,5‐Diaminobenzoate with Some Aromatic Dicarboxylic Acids

Abstract

A new set of polycondensates with –CO–NH– groups was synthesized by the direct reaction of 2′‐(chalcone‐4‐oxy)ethyl 3,5‐diaminobenzoate with various aromatic dicarboxylic acids using phosphorylation protocol. The polymers were produced in high yields and with moderate inherent viscosities (0.62–0.76 dL/g). The obtained polyamides were essentially amorphous as revealed by differential scanning calorimetry (DSC) and X‐ray diffraction (XRD) measurements and are readily soluble in a variety of aprotic polar solvents affording films from their solutions. They showed glass‐transition temperatures ranging from 216 to 254°C and were thermally stable with 10% weight loss temperatures over 380°C, in nitrogen atmosphere. UV spectroscopy was used in order to confirm the presence of oxyethylchalconyl pendant group in the polymer structures.

Keywords:

• polycondensates
• polyamides
• Yamazaki‐Higashi reaction
• chalcone
• oxyethyl segment