Miscibility in crystalline/amorphous blends of poly(3-hydroxybutyrate)/DGEBA |
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| Authors: | Leonel Silva Sebastián Tognana Walter Salgueiro |
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| Affiliation: | 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;2. 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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| Keywords: | biodegradable blends calorimetry crystallization epoxy resin miscibility SAXS |
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