Biodegradable aromatic copolyesters made from bicyclic acetalized galactaric acid
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Tipus de documentArticle
Data publicació2012-08-15
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Abstract
Random poly(hexamethylene terephthalate-co-galactarate)
s and poly(dodecamethylene terephthalate-co-galactarate)
s copolyesters covering the whole range of compositions
were obtained with weight-average molecular weights of
30,000–50,000 g mol 1 by melt polycondensation. They were
thermally stable above 300 C, and displayed Tg in the þ20 to 20
C range with values steadily decreasing with the content in galactarate
units. All the copolyesters were semicrystalline with Tm
between 50 and 150 C and those made from dodecanediol were
able to crystallize from the melt at a crystallization rate depending
on composition. Copolyesters containing up to 50% of galactaric
units retained the crystal structure of their respective polyterephthalate
homopolyesters, whereas they adopted the structure of
the respective polygalactarates when the content in Galx units
reached 70%. Stress-strain essays revealed decay in the mechanical
parameters as the aromatic units were replaced by Galx. Incubation
in aqueous buffer revealed that hydrolysis of the
polyesters were largely enhanced by copolymerization and evidenced
the capacity of the Galx unit for making aromatic polyesters
susceptible to biodegradation. A detailed NMR analysis
complemented by SEM observations indicated that hydrolysis
took place by preferred splitting of galactarate ester bonds with
releasing of alkanediol and Galx-diacid.
CitacióLavilla, C. [et al.]. Biodegradable aromatic copolyesters made from bicyclic acetalized galactaric acid. "Journal of polymer science. Part A, polymer chemistry", 15 Agost 2012, vol. 50, núm. 16, p. 3393-3406.
ISSN0887-624X
Versió de l'editorhttp://onlinelibrary.wiley.com/doi/10.1002/pola.26128/abstract
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