Samuel Kyeremateng - Pressure–volume–temperature data and surface tension of blends of poly(ethylene oxide) and poly(methyl acrylate) in the melt

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      Publication Details (including relevant citation   information):

      J Polym Sci Part B: Polym Phys 48: 1893–1900, 2010


      The pressure–volume–temperature behavior of miscible blends   of  poly(ethylene oxide) (PEO) and poly(methyl acrylate)   (PMA) was studied  over extended ranges of temperature and   pressure. From  pressure–volume–temperature data, the   reduction parameters for the  Flory-Orwoll-Vrij   equation-of-state were determined. It was found that    reduction parameters as well as density, thermal expansion   coefficient,  and isothermal compressibility vary with   composition in a nonlinear  manner. The surface tension of   the blends in the molten state was  measured over the whole   composition range using the sessile drop method.  The   surface tension was found to display negative deviation   from  additivity pointing toward a remarkable surface excess   of PMA. Moreover,  surface tension displays a minimum in the   range of low PEO content at  weight fraction of ∼0.19. In   addition, the temperature coefficient of  surface tension   shows negative deviation from linearity. It stays  constant   when PMA is in excess. Results are discussed in terms of    equation-of-state thermodynamics. The minimum of surface tension   can be  well explained by weak self-association of PEO in   the bulk.

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