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  • 1 Center of Technological Applications and Nuclear Development (CEADEN), P. O. Box 6122, Havana, Cuba
  • | 2 Institute of Material Science and Technology (IMRE), Havana, Cuba
  • | 3 Cuban Institute for Research on Sugar Cane By-Products (ICIDCA), Havana, Cuba
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Abstract

A new polyacrylic acid/polyhydroxybutyrate semi-interpenetrating polymer network hydrogel, the s-IPN/PAA-PHB, was prepared by a gamma radiation-induced polymerization. Thermal behavior was studied by thermogravimetric analysis (TG) and Differential scanning calorimetry (DSC), while the s-IPNs composition, FTIR spectra, and swelling kinetics were also determined. It was found that the DSC curve showed a melting point which is attributed to polyhydroxybutyrate. The TG curves showed various stages of degradation which are in correspondence of the presence of crosslinked polyacrylic acid and confirmed the higher thermal stability of the polymer network. The s-IPN/PAA-PHB composition was 10% of PHB and 90% of PAA. Moreover, the network reached approximately 600% of swelling in water, so it behaves like a superabsorbent hydrogel.

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