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Miscibility in crystalline/amorphous blends of poly(3-hydroxybutyrate)/DGEBA

Authors

  • Leonel Silva,

    1. IFIMAT, Facultad de Ciencias Exactas, UNCPBA, Pinto 399, 7000 Tandil, Argentina and Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Av. Rivadavia 1917, 1033 Buenos Aires, Argentina
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  • Sebastián Tognana,

    1. IFIMAT, Facultad de Ciencias Exactas, UNCPBA, Pinto 399, 7000 Tandil, Argentina and Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Calle 526 entre 10 y 11, 1900 La Plata, Argentina
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  • Walter Salgueiro

    Corresponding author
    1. IFIMAT, Facultad de Ciencias Exactas, UNCPBA, Pinto 399, 7000 Tandil, Argentina and Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Calle 526 entre 10 y 11, 1900 La Plata, Argentina
    • IFIMAT, Facultad de Ciencias Exactas, UNCPBA, Pinto 399, 7000 Tandil, Argentina and Comisión de Investigaciones Científicas de la Provincia de Buenos Aires, Calle 526 entre 10 y 11, 1900 La Plata, Argentina
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Abstract

A differential scanning calorimetry (DSC) and small-angle X-ray scattering (SAXS) study of miscibility in blends of the semicrystalline polyester poly(3-hydroxybutyrate) (PHB) and amorphous monomer epoxy DGEBA (diglycidyl ether of bisphenol A) was performed. Evidence of the miscibility of PHB/DGEBA in the molten state was found from a DSC study of the dependence of glass transition temperature (Tg) as a function of the blend composition and isothermal crystallization, analyzing the melting point (Tm) as a function of blend composition. A negative value of Flory–Huggins interaction parameter χPD was obtained. Furthermore, the lamellar crystallinity in the blend was studied by SAXS as a function of the PHB content. Evidence of the segregation of the amorphous material out of the lamellar structure was obtained. © 2013 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys, 2013

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