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The adsorption of a copolymer of vinyl pyrrolidone and allylamine at the silica-solution interface

✍ Scribed by I.D. Robb; R. Smith

Publisher
Elsevier Science
Year
1974
Tongue
English
Weight
420 KB
Volume
10
Category
Article
ISSN
0014-3057

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✦ Synopsis

The conformation of a copolymer of vinyl pyrrolidone and allylamine adsorbed at the silica solution interface has been studied by EPR spectroscopy. Spin labels attached at random along the polymer backbone have allowed the fractions of segments in trains and loops to be measured. The polymer changed from a relatively flattened conformation to a more looped one with increasing surface coverage: the effect on the conformation of changing solvent from pure water to 0.1 N NaC1 or chloroform was small. The time for changes between the flattened and looped conformation was less than 2 min and bridging of the polymer molecules between silica particles was demonstrated. INTRODLCTION

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