Modelling of the Viscoelastic Behavior of Homogeneous and Heterogeneous Blends of Polyisoprene and Polybutadiene.
Abstract
The mechanical model of Takayanagi has been used to describe the viscoelastic behavior of various blends of a ternary elastomer system (cis 1,4 polyisoprene, 1,4 polybutadiene and the corresponding polyisoprene/polybutadiene diblock) for which extensive mechanical properties data have already been reported. Through the use of appropriate composition - temperature shifts which rely on the assumption of free volume additivity, it was possible to model the behavior of the homogeneous diblock copolymers of polyisoprene and polybutadiene as well as various homogeneous binary and ternary blends of a diblock with either or both of the diene homopolymers. Heterogeneous ternary blends were also modelled successfully assuming that the diblock was solubilized preferentially by one of the phases in the blend. The model predictions were very sensitive to the location of the diblock, and thus comparison with experimental results provided a useful tool for verifying earlier assumptions regarding the role of the homogeneous diblock copolymers in these elastomer blends. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 18, 1979
- Accession Number
- ADA064145
Entities
People
- A. R. Ramos
- Robert E. Cohen
Organizations
- Massachusetts Institute of Technology