Thermal and morphology characterization of blends of poly(ethylene oxide) with poly(vinyl acetate)

✍ Scribed by N.K. Kalfoglou; D.D. Sotiropoulou; A.G. Margaritis

• Publisher: Elsevier Science
• Year: 1988
• Tongue: English
• Weight: 974 KB
• Volume: 24
• Category: Article
• ISSN: 0014-3057
• DOI: 10.1016/0014-3057(88)90204-2

✦ Synopsis

Thermal and morphology studies were carried out to characterize the mutual miscibility of poly(ethylene oxide)/poly(vinyl acetate) (PEO/PVAC) blends. The techniques used were DSC and polarized microscopy and the study covered the complete composition range. Morphology revealed qualitative differences between melt-pressed and solvent-cast films. Determination of melting point depression (T~) of annealed melt-pressed films allowed determination of the Z12 interaction parameter of the two polymers in the melt, using available theory. To obtain equilibrium T,~ data, the Hoffman-Weeks procedure was applied to take into account the influence of crystal morphology. The results indicate that the blends are miscible at higher PVAC contents (wt fraction 30.4) and Xt2 has a negative value (-0.30) comparable to interaction parameter values of analogous miscible semicrystalline-amorphous blends,