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Article: Applications for stress relaxation from the RPA in characterization and quality control. (controlling the viscoelastic quality of raw polymers)
- Article from:
- Rubber World
- Article date:
- January 1, 1997
- Author:
CopyrightCOPYRIGHT 1997 Lippincott & Peto, Inc. This material is published under license from the publisher through the Gale Group, Farmington Hills, Michigan. All inquiries regarding rights should be directed to the Gale Group. (Hide copyright information)
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Uncured and cured rubber is neither completely viscous or elastic in nature, but rather viscoelastic in its properties. Understanding this viscoelastic profile is very important in predicting processing behavior as well as the nature of the cured physical properties imparted to the final rubber product. A very fast and simple way to quantify a rubber's viscoelasticity is to perform a stress relaxation experiment. The Maxwell Model shown in figure 1 illustrates this principle very well with a spring and dashpot in series (ref. 1). A sudden applied extensional deformation results in a characteristic stress relaxation curve as shown. A log-log plot of the resulting curve is ...