Solid State 13C NMR Study of Modified Polyhydroxybutyrate
P. Vrábela, V. Hronskýa, O. Fričováa, M. Koval'akováa, I. Chodákb, P. Alexyc
aDepartment of Physics, Technical University of Košice, Park Komenského 2, 042 00 Košice, Slovakia
bPolymer Institute, Slovak Academy of Sciences, Dúbravská cesta 9, 845 41 Bratislava, Slovakia
cInstitute of Polymer Materials, Slovak University of Technology, Radlinského 9, 812 37 Bratislava, Slovakia
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Structural changes in polyhydroxybutyrate (PHB) brought about by addition of chain extender and/or plasticizer were studied using 13C MAS NMR spectra, which were measured using the direct polarization technique at 30 and 98°C. Four resonances associated with the CO, CH, CH2 and CH3 groups of PHB were observed in the spectra. The CH3 resonance appearing at 98°C shows splitting into two lines related to the crystalline and amorphous regions. Analysis of the CH3 resonances made it possible to estimate the influence of applied modifications on crystallinity and distribution of conformations in amorphous and crystalline domains of PHB samples.

DOI: 10.12693/APhysPolA.126.419
PACS numbers: 61.41.+e, 76.60.-k, 81.05.Lg