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Complexation between poly(methacrylic acid) and poly(vinylpyrrolidone)
Author(s) -
Liu Shouxin,
Fang Yu,
Hu Daodao,
Gao Gailing,
Ma Jianbiao
Publication year - 2001
Publication title -
journal of applied polymer science
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.575
H-Index - 166
eISSN - 1097-4628
pISSN - 0021-8995
DOI - 10.1002/app.1890
Subject(s) - poly(methacrylic acid) , methacrylic acid , monomer , polymer , polymer chemistry , polyelectrolyte , hydrogen bond , aqueous solution , chemistry , fluorescence , copolymer , materials science , molecule , organic chemistry , physics , quantum mechanics
The complexation between poly(methacrylic acid) (PMAA) and poly(vinylpyrrolidone) (PVP) in aqueous phase was studied by various fluorescence techniques, including fluorescence anisotropy measurements, fluorescence probe studies, and nonradiation energy transfer. It was demonstrated that the complexation of PMAA with PVP occurs within a pH range of 1 to 5 and along with complexation, the conformation of PMAA changed from a hypercoiled to a loosely coiled form. The complex ratio between the two polymers is 2:1 (PMAA/PVP, in monomer unit). Salt effect studies showed that the complexation occurred due to formation of hydrogen bonds between the two polymers. Based on these conclusions and the “connected cluster model” for PMAA at low pH, a “ladder with connected cluster” model was proposed for the structure of PMAA/PVP complex formed at low pH. © 2001 John Wiley & Sons, Inc. J Appl Polym Sci 82: 620–627, 2001