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Synthesis and characterization of novel aromatic polyamides containing pendent coumarin groups

M. ONCIU1,*

Affiliation

  1. Institute of Macromolecular Chemistry ”P. PONI”, Aleea Gr. Ghica Voda 41A, 700487, Iasi, Romania

Abstract

A novel coumarin-containing monomer, 7-[2`-(1,3-diamino-5-benzoyloxy)ethyl]oxy-chromen-2-one, was prepared, characterized and used in a direct polycondensation reaction with different aromatic diacids to give polyamides having chromenyl side groups, which include an oxyethylenyloxy flexible spacer. These polyamides were obtained with inherent viscosities above 0.78 and up to 1.21 dL/g. The number-average molecular weights were in the range of 27.000-46.000 g/mol. All the resulting polymers were amorphous and soluble in polar solvents such as N-methyl-2-pyrrolidinone (NMP), N,N-dimethylacetamide (DMAc), N,N-dimethylformamide (DMF), dimethylsulfoxide (DMSO) and dioxane, and afforded strong, flexible and homogeneous films by solution-casting. The polyamides under study showed distinct glass transitions on the differential scanning calorimetry (DSC) curves ranging from 191 °C to 223 °C. Coumarin chromophores underwent [2+2] cycloaddition reaction under λ = 313 nm light irradiation to yield crosslinked network structures..

Keywords

New monomer, Aromatic polyamides, Direct polycondensation, Coumarin pendent groups, Photocrosslinking.

Submitted at: Nov. 2, 2006
Accepted at: April 15, 2007

Citation

M. ONCIU, Synthesis and characterization of novel aromatic polyamides containing pendent coumarin groups, Journal of Optoelectronics and Advanced Materials Vol. 9, Iss. 4, pp. 1014-1018 (2007)