Viscoelastic Characterization of Sealant Materials
Donald L. Hunston, Christopher C. White
Polymeric sealants are an important example of a major consumer product where the performance depends critically on rheological properties. The work here developed a testing and modeling procedure to characterize the basic mechanical properties of sealant materials and demonstrated the procedure on 5 different samples. These materials span the range of properties found in commercial sealants. All of the materials tested exhibited the Mullins effect, and stress-strain tests were used to characterize this behavior. The non-linear viscoelastic properties were then examined with stress-relaxation experiments. Although the behavior is rather complex, the time dependence and strain dependence were shown to be relatively independent which greatly simplified modeling and characterization.. An important application of this characterization procedure is to follow changes that occur in a sealant when it is exposed to environmental conditions, and this is an important step toward developing life prediction models.
Society of Adhesion
characterization, methodology, modulus, sealant, service life prediction, stress-strain, viscoelastic