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Journal of the Brazilian Chemical Society
Print version ISSN 0103-5053On-line version ISSN 1678-4790
SILVA, Marcelo G. da et al. Structural impact of hydroxyvalerate in polyhydroxyalkanoates (PHAscl) dense film monitored by XPS and photothermal methods. J. Braz. Chem. Soc. [online]. 2005, vol.16, n.4, pp.790-795. ISSN 0103-5053. http://dx.doi.org/10.1590/S0103-50532005000500017.
Poly(3-hydroxybutyrate) and poly(3-hydroxybutyrate-co-3-hydroxyvalerate) polymer dense films with thickness of 90 µm were obtained by the casting method and characterized using X-ray photoelectron spectroscopy, differential scanning calorimetric and photo-thermal methods. The HV molar fractions in the copolymer structure were 8, 14 and 22 mol %. The measured specific thermal capacity and the glass transition temperature of the P3(HB-co-x%HV) decrease for increasing hydroxyvalerate content following a similar trend.
Keywords : polymers; photoacoustics; XPS; thermal properties.