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Hyperbranched Aromatic Polyesters
Author(s) -
Walczak Małgorzata,
Lechowicz Jaromir B.,
Galina Henryk
Publication year - 2007
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.200751013
Subject(s) - monomer , polyester , yield (engineering) , polymerization , polymer chemistry , condensation polymer , polymer , materials science , chemistry , organic chemistry , composite material
Summary: Having developed a theoretical model of hyperbranched polymerization involving AB 2 and B 2 monomers we present preliminary results of a test of its validity for the system consisting of 4,4‐bis(4‐hydroxyphenyl)pentanoic acid (AB 2 monomer) and bisphenol A (B 2 monomer). The monomers reacted at room temperature to yield the title hyperbranched polyesters. Diisopropylcarbodiimide (condensation water remover) along with an effective catalyst were used for that purpose. The total of AB 2 monomer was introduced at once to a reactor containing B 2 core monomer or it was divided into 3 or 5 equal portions and each of them introduced after the monomers previously present have reacted to a predetermined conversion. GPC measurements of the resulting molecular mass distribution gave inconclusive results because of poor reproducibility of polymer isolation/purification procedure and/or insufficient accuracy of GPC technique.