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Fluorescence and viscometry study of complexation of poly(acrylic acid) with poly(acrylamide) and hydrolysed poly(acrylamide) |
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| Authors: | K. Sivadasan P. Somasundaran N. J. Turro |
| Affiliation: | (1) Langmuir Center for Colloids and Interfaces, Henry Krumb School of Mines, Columbia University, 10027 New York, NY, USA;(2) Department of Chemistry, Columbia University, New York, USA;(3) Chemistry Section, Oil & Natural Gas Commission, Bombay, India |
| Abstract: | Interpolymer complexation of poly(acrylic acid) with poly(acrylamide) and hydrolysed poly(acrylamide) was studied by fluorescence spectroscopy and viscometry in dilute aqueous solutions. Changes in chain conformation and flexibility due to the interpolymer association are reflected in the intramolecular excimer fluorescence of pyrene groups covalently attached to the polymer chain. Both poly(acrylamide) and hydrolysed poly(acrylamide) form stable complexes with poly(acrylic acid) at low pH. The molecular weight of poly(acrylic acid) and solution properties such as pH and ionic strength were found to influence the stability and the structure of the complexes. In addition, the polymer solutions mixing time showed an effect on the mean stoichiometry of the complex. The intrinsic viscosity of the solutions of mixed polymers at low pH suggested a compact polymer structure for the complex. |
| Keywords: | Interpolymercomplexation excimerfluorescence cooperativebinding equilibrationtime meanstoichiometry |
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