To
study the effects of the main and side chains on the physical
properties of polyesters containing anthraquinone substituents, two
types of 1,5-dihydroxy-2,3,6,7-tetraalkoxyanthraquinones (DHTAAQs)
were prepared from gallic acid, a major component of hydrolyzable
tannins, and polymerized with five dicarboxylic dichlorides by interfacial
polymerization. The solubility of the fabricated polyesters was strongly
affected by the alkoxy side chains of the DHTAAQ units. Conversely,
their thermal decomposition behavior depended on the structure of
the dicarboxylate units. The thermal properties of the anthraquinone-based
polyesters were influenced by both the dicarboxylate units and alkoxy
groups, and their glass transition temperature could be controlled
over a wide range (81–308 °C). To design DHTAAQ-based
polyesters with adequate solubility and high heat resistance, it is
preferable that first suitable alkoxy groups are selected to provide
the necessary solubility, and then appropriate aromatic dicarboxylate
units are chosen to obtain the required thermal properties.
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