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Synthesis and characterization of hyperbranched aromatic polyesters used for polymeric graded‐index materials
Author(s) -
Kou Huiguang,
Shi Wenfang,
Lu Yonghua,
Ming Hai
Publication year - 2003
Publication title -
polymer international
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.592
H-Index - 105
eISSN - 1097-0126
pISSN - 0959-8103
DOI - 10.1002/pi.1185
Subject(s) - polyester , monomer , gel permeation chromatography , branching (polymer chemistry) , materials science , polymer chemistry , molecule , fluorescence , polymer , organic chemistry , chemistry , physics , quantum mechanics
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