Interaggregate Interaction in Filled Rubber
Abstract
Recent studies of miscible blends of 1, 2-polybutadiene with cis-1,4- polyisoprene revealed that for certain compositions the glass to rubber transition occurs over a very broad temperature range. Measurements of the dynamic properties of carbon black filled rubber can be carried out on most- instrumentation at strains within the limits of linear behavior, thus, assessments of acoustic performance can readily be made. The equivalence of small strain dynamic mechanical testing and acoustic measurements has been demonstrated herein. Blends of Natural Rubber with a high concentration of 1,2- Butyl Rubber are attractive candidates for damping applications because of the extended frequency range of the glass to rubber transition. One approach to improving the magnitude of the damping is to incorporate high levels of carbon black into the material. Significant interaggregate interaction, promoted for example by a low degree of carbon black dispersion, will amplify the energy dissipation. The strain dependence of the dynamic properties implicit in such an approach can result in a damping performance sensitive to deformation. This sensitivity to deformation will impact more on constrained layer damping applications than on simple extensional damping. For the materials tested in the present study, complete recovery of the damage to the carbon black network (which engenders the changes in dynamic mechanical properties) requires more than a day at room temperature.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1989
- Accession Number
- ADA212824
Entities
People
- C. Michael Roland
- G. F. Lee
Organizations
- United States Naval Research Laboratory