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Polímeros

versão impressa ISSN 0104-1428

Resumo

MONTORO, Sérgio R. et al. Kinetic study of the molecular weight reduction of poly (3-hydroxybutirate-co-3-hydroxyvalerate) (PHBHV). Polímeros [online]. 2010, vol.20, n.1, pp.19-24.  Epub 05-Fev-2010. ISSN 0104-1428.  https://doi.org/10.1590/S0104-14282010005000005.

In this work a kinetic study was carried out of the molecular weight reduction of poly(3-hydroxybutirate-co-3-hydroxyvalerate) (PHBHV) in three different methodologies: acid hydrolysis using hydrochloric acid, transesterification with ethylene glycol or hexylene glycol and reduction in the presence of sodium borohydride (NaBH4). The following process parameters were investigated: time, temperature, type and concentration of catalysts. The results of molecular weight reduction were fitted with a n-order kinetic model. The kinetics analysis has shown that the NaBH4 reduction was the most efficient in terms of reaction rate in comparison with the other methods.

Palavras-chave : Polyhydroxyalkanoates; PHBHV; molecular weight reduction; kinetic analysis.

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