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- W2000743657 abstract "Abstract Polymer films which possess strong intermolecular forces are only slightly expanded and not very stable. When strongly hydrophilic groups are present ( e.g. , OH, COOH), but the lattice forces are high, stable films exist only at surface pressures of a few dynes/cm. Without strongly hydrophilic groups the films tend to collapse spontaneously. A series of polymethacrylate films illustrate the effect of the side chain on the film character. Short side chains result in strong intermolecular forces and coherent films; flexible side chains reduce these forces, giving a more expanded type, while large side chains introduce secondary cohesion. High viscosity and intermolecular cohesion will account both for hysteresis and collapse phenomena in such films. At the oil-water interface the intermolecular forces parallel to the surface are greatly reduced, and the differences between coherent and fluid films become less pronounced. The low resolved surface dipole moment of polyvinyl alcohol and polyacrylic acid is attributed to hydrogen bonding. The effect of ionization of films of polyacids on their surface properties is described, solution of the film taking place when a sufficient proportion of residues become charged. Polyamides form very coherent films due to bonding of the peptide link, and the bearing on this on the structure of protein films is discussed. Evidence is provided that films of proteins as well as other polymeric substances form a three-dimensional “overfilm” when they collapse." @default.
- W2000743657 created "2016-06-24" @default.
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- W2000743657 date "1946-03-01" @default.
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- W2000743657 title "Surface films of polymers. Part II. Films of the coherent and semi-crystalline type" @default.
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- W2000743657 doi "https://doi.org/10.1016/0095-8522(46)90014-1" @default.
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