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    Surface Dilatational Moduli of Poly(vinyl acetate) (PVAc) and PVAc-Poly(n-hexyl isocyanate) (PHIC) Blend Films at the Air–Water Interface

    Year: 2011

    Journal: Langmuir, 2011, 27 (14), 8672–8677, 20131009

    Authors: Takako Morioka, Masami Kawaguchi

    Organizations: Division of Chemistry for Materials, Graduate School of Engineering, Mie University, 1577 Kurimamachiya, Tsu, Mie 514-8507, Japan

    Surface dilatational moduli of poly(vinyl acetate) (PVAc) film and blend films of PVAc and poly(n-hexyl isocyanate) (PHIC) were measured at the air–water interface. PVAc formed a film that was looser and also more stable against strain than the PHIC film. The apparent surface dilatational modulus and surface pressure of the blend films were superimposed on the lower concentration of PVAc, irrespective of the composition of PVAc. However, the additivity rule was not applicable to the apparent surface dilatational modulus and surface pressure. The scaling exponents of the apparent surface dilatational modulus against the added surface concentration decreased with an increase in the proportion of PVAc, suggesting that blend films gradually change from glass material to expanded films.