Mixed films of poly(n-hexyl isocyanate) and poly(vinyl acetate) at the air-water interface.
We study interfacial properties of rigid-rod-like poly(n-hexyl isocyanate) (PHIC), flexible poly(vinyl acetate) (PVAc), and mixed films of PHIC and PVAc spread at the air-water interface as a function of the molar fraction of PHIC by surface pressure measurements and fluorescence microscopy. From the plots of the experimental mean area of the mixed polymer films at a constant surface pressure as a function of the molar fraction of PHIC in the mixed films, the binary mixtures of PHIC/PVAc were concluded to be compatible at the air-water interface. This means that the hydrophobic hexyl group of PHIC takes a horizontal orientation to the air-water interface rather than a perpendicular one, leading to PHIC and PVAc having the same interfacial orientation. Compatibility of the binary mixtures of PHIC/PVAc at the air-water interface is also confirmed by their fluorescence microscopic images, since PHIC proves to be inhomogeneous and PVAc is homogeneous with the aid of a fluorescence probe, respectively.
Kawaguchi
Masami
M
Department of Chemistry for Materials, Faculty of Engineering, Mie University, 1577 Kurimamachiya, Tsu, Mie 514-8507, Japan. kawaguti@chem.mie-u.ac.jp
Suzuki
Mikage
M
D000388:Air; D008567:Membranes, Artificial; D008856:Microscopy, Fluorescence / Q000379:methods; D009570:Nitriles / Q000737:chemistry*; D011145:Polyvinyls / Q000737:chemistry*; D012680:Sensitivity and Specificity; D013500:Surface Tension; D014867:Water / Q000737:chemistry
D008567:Membranes, Artificial; D009570:Nitriles; D011145:Polyvinyls; C514553:poly(n-hexyl isocyanate); D014867:Water; C013215:polyvinyl acetate