Physicochemical properties of multicomponent poly(hydroxyalkanoates) |
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| Authors: | T G Volova P V Mironov A D Vasil’ev |
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| Institution: | (1) Institute of Biophysics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia;(2) Siberian State Technological University, Krasnoyarsk, 660049, Russia;(3) Kirenskii Institute of Physics, Siberian Division, Russian Academy of Sciences, Krasnoyarsk, 660036, Russia |
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| Abstract: | The properties of new five-component poly(hydroxyalkanoates) (PHA) formed by short-and medium-chain monomers synthesized by the bacterium Wautersia eutropha B5786 were studied by X-ray diffraction, IR spectroscopy, differential thermal analysis, and viscometry. The degree of crystallinity of PHA decreased from 72 to 57% as the molar fraction of hydroxyhexanoate increased from 2.5 to 18.0 mol%. The melting temperature (T m) and decomposition temperature (T d) of the multicomponent PHA are lower than those for poly(hydroxybutyrate), whose T m and T d are 168–170 and 260–265°C, respectively. Both parameters of the multicomponent PHA decrease to 156 and 252°C, respectively, as the hydroxyhexanoate mole fraction is raised. The effect of hydroxyhexanoate on the physicochemical properties of the PHA is similar to that of hydroxyvalerate observed previously. |
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| Keywords: | poly(hydroxybutyrate) hydroxyhexanoate hydroxyvalerate |
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