This paper was presented at a Symposium on PVC Foams, American Chemical Society National Meeting, Philadelphia, Pennsylvania, April 1975
Viscoelastic characterization of PVC plastisol melts for foam applications†
Article first published online: 9 MAR 2003
Copyright © 1976 John Wiley & Sons, Inc.
Journal of Applied Polymer Science
Volume 20, Issue 5, pages 1187–1198, May 1976
How to Cite
Nakajima, N., Ward, D. W. and Collins, E. A. (1976), Viscoelastic characterization of PVC plastisol melts for foam applications. J. Appl. Polym. Sci., 20: 1187–1198. doi: 10.1002/app.1976.070200505
- Issue published online: 9 MAR 2003
- Article first published online: 9 MAR 2003
- Manuscript Received: 15 JUL 1975
Melt rheology and its time-temperature dependence have long been known to be fundamental properties associated with satisfactory expansion characteristics in vinyl foam. Since much is known about the relationship between rheology and material variables like polymer morphology and system composition, adequate rheological characterization should be quite helpful in polymer design and plastisol compounding.
Earlier attempts to study the melt rheology of plasticized PVC foam systems were only partially successful because instrument limitations required that the material be studied at too high shear rate or temperature, or that behavior of specific compositions be extrapolated from data obtained at considerably higher plasticizer level.
This paper deals with measurement of the viscoelastic behavior of melts from actual azodicarbonamide foam compositions. The Rheometrics Mechanical Spectrometer was used in the orthogonal mode to study both elastic modulus and loss modulus (viscosity) in the range of shear rates and temperatures which actually occur during commercial utilization of PVC foam compounds. The effects of changing vinyl resin types and plasticizer types and levels were explored.