Crosslinking aqueous poly(vinyl pyrrolidone) solutions by persulfate
Article first published online: 9 MAR 2003
Copyright © 1979 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 23, Issue 8, pages 2453–2462, 15 April 1979
How to Cite
Anderson, C. C., Rodriguez, F. and Thurston, D. A. (1979), Crosslinking aqueous poly(vinyl pyrrolidone) solutions by persulfate. J. Appl. Polym. Sci., 23: 2453–2462. doi: 10.1002/app.1979.070230823
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Received: 5 JUN 1978
Aqueous solutions with 1.5 to 6.5 wt-% poly(vinyl pyrrolidone), PVP, are converted to stable gels by reaction with potassium persulfate. Large quantities of persulfate are needed for high-modulus gels, 50% to 150% of the weight of PVP being required typically. The shear modulus G′ can be measured during reaction by making the gel the restoring element in a simple torsion pendulum. The increase in modulus to a maximum plateau value of G′max can be expressed as a first-order process:
Where t is elapsed time of reaction and K increases with the square root of polymer concentration. G′max varies with the second power of the polymer concentration. It also increases rapidly with increasing temperature of reaction and with persulfate/PVP ratio.