Affiliation:
1. "Petru Poni" Institute of Macromolecular Chemistry, Iasi, Romania
Abstract
New aromatic polyesters with photosensitive groups in their pendant chains
were prepared from a diphenol carrying as substituent a cinnamoyl group
extended with a flexible oxyethyleneoxy spacer and different aromatic
dicarboxylic acids via direct polyesterification reaction in the presence of
tosyl chloride/pyridine/dimethylformamide system as condensing agent. The
resulting polyesters were characterized using Fourier-transform IR, proton
and carbon nuclear magnetic resonance and ultraviolet spectroscopy,
differential scanning calorimetry, thermogravimetric analysis, wide-angle
X-ray diffractometry, gel permeation chromatography, viscosity measurement
and solubility test. These polyarylates had moderate inherent viscosities
ranging from 0.37 to 0.54 dL g-1, good solubility in polar aprotic solvents,
and afforded transparent, colorless and apparently tough films by casting
from their solutions. Their glass-transition temperatures ranged from 136 to
154?C. All of them did not show significant decomposition below 320?C and
retained 38-47 % weight at 700?C in nitrogen atmosphere. The presence of
cinnamoyl chromophore endowed these polymers with the ability to react to
ultraviolet light which resulted in photodimerization between cinnamoyl side
groups upon irradiation at l = 365 nm and cross-linking the polymers chains
in the absence of photo-initiators or photo-sensitizers. As a consequence,
the polymer films became insoluble in organic solvents.
Publisher
National Library of Serbia
Cited by
5 articles.
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