Abstract
The lamellar morphology of a melt-miscible blend consisting of random poly(3-hydroxybutyrate-co-3-hydroxyvalerate) (P(HB-co-HV)) copolymer containing 10 mol% HV units and poly(methyl methacrylate) (PMMA) prepared by solution casting films have been investigated by means of small angle X-ray scattering (SAXS), differential scanning calorimetry (DSC) and polarized optical microscope (POM). The composition dependence of the amorphous layer thickness (la), and the volume fraction of the P(HB-co-HV) lamellar stack (φs) revealed that the interfibrillar segregation morphology was generated, where the extent of interfibrillar segregation of PMMA increased with increasing PMMA content. The Lorentz-corrected SAXS profiles of the blends crystallized at Tc=40 ○C has observed “zero-angle scattering”, attributed to the electron density contrast between the lamellar stack domains consisting of alternating crystalline/amorphous layers and the PMMA-rich domains located outside the lamellar stack domains.
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