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Synthesis and characterization of hyperbranched aromatic polyesters used for polymeric graded-index materials

✍ Scribed by Huiguang Kou; Wenfang Shi; Yonghua Lu; Hai Ming

Publisher
John Wiley and Sons
Year
2003
Tongue
English
Weight
165 KB
Volume
52
Category
Article
ISSN
0959-8103

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✦ Synopsis

Abstract

A series of hyperbranched aromatic polyesters, with different numbers of terminal naphthyl groups per molecule, were synthesized from 5‐hydroxyisophthalic acid as an AB~2~ type monomer and ethylenediaminetetraacetic acid as an ‘initiator core’ molecule via an ‘one‐step’ approach, to be modified with β‐naphthol. These polyesters had polydispersities in the range 1.78–2.13, indicated by gel permeation chromatography, and degrees of branching between 0.45 and 0.60 by ^1^H NMR using model compounds. Characterization indicated intense absorption bands in the near‐UV spectral region and one fluorescence centre with emission at 365 nm. The refractive index increased with the number of naphthyl groups up to a value of 1.6205. The diffraction efficiency was about 8.7% for diffraction grating of cured films. Copyright © 2003 Society of Chemical Industry

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