Studies on comonomer compositional distribution and its effect on some physical properties of bacterial poly(3-hydroxybutyric acid-co-3-hydroxypropionic acid)

Studies on comonomer compositional distribution and its effect on some physical properties of bacterial poly(3-hydroxybutyric acid-co-3-hydroxypropionic acid)

Studies on comonomer compositional distribution and its effect on some physical properties of bacterial poly(3-hydroxybutyric acid-co-3-hydroxypropionic acid)

Abstract

Comonomer compositional distribution of bacterially synthesized poly(3-hydroxybutyric
acid-co-3-hydroxypropionic acid) [P(3HB-co-3HP)] was investigated via solvent/non-solvent fractionation techniques. The result indicates the presence of extremely broad comonomer compositional
distribution in the original bacterial product. Furthermore, utilizing compositionally fractionated
bacterial copolyesters with much narrower comonomer compositional distributions, the 3HP comonomer content-dependence of their thermal and crystallization behavior was studied by means of
differential scanning calorimeter (DSC) and polarized optical microscopy and the results compared
with those of unfractionated copolyesters. It was revealed that the physical features of the fractionated
copolyester P(3HB-co-3HP)s strongly depends on the 3HP comonomer content. In addition, to clarify
the effect of the compositional distribution on the properties of the unfractionated copolyester, the
miscibility between bacterial poly(3-hydroxybutyric acid) [P(3HB)] and two fractionated P(3HB-co-
3HP) samples with 11.3 and 14.9% 3HP was investigated for blends obtained by solvent casting
techniques. The evidence of thermal analysis and spherulitic growth rates imply miscibility of the
P(3HB)/3HB-rich P(3HB-co-3HP) binary blends.

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