The crystalline structure and thermal behavior of new types of bacterial copolyester, poly (3-hydroxybutyrate-
co-3-hydroxyhexanoate) and polyhydroxybutyrate, PHB have been explored by means of wide-angle x-ray diffraction (WAXD) and infrared (IR) spectroscopy. It has been found from the temperature dependent variations of the WAXD pattern and IR spectra that C-H…O hydrogen bonding between C=O groups and CH
3 groups along the
a axis and that the interactions are broken little by little from just above room temperature. The C-H…O hydrogen bonding between C=O groups and CH
3 groups along the a axis may explain chain folding plane parallel to the
a axis direction of PHB.
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