Abstract
Miscibility behaviour of poly- d(−)(3-hydroxybutyrate) (PHB)/poly(ethylene oxide) (PEO) and PHB/poly(methyl methacrylate) (PMMA) blends were studied using differential scanning calorimetry and the vapour sorption technique. The PHB/PEO system showed a single glass transition, whereas two glass transitions were observed for the PHB/PMMA system over the entire range of composition tested. The addition of PEO, which has been reported to be miscibile with PHB as well as PMMA, did not enhance the compatibility of PHB and PMMA. Polymer polymer interaction parameters obtained by the chloroform vapour sorption technique were found to be negative for PHB/PEO and positive for PHB/PMMA systems. However, the interaction parameters of both systems change significantly with composition.
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