Molecular Theory of Viscoelasticity for Homogeneous Block and Graft Copolymers.
Abstract
The Rouse-Bueche-Zimm molecular theory of viscoelasticity has been extended to compute the retardation time spectra of radial block and graft copolymers of various configurations and compositions. The basic assumption of the model is that the effect of the presence of foreign blocks and grafts on the retardation spectrum is due to the difference in the friction coefficients. Mathematically this modification is accomplished by introducing into the equations of motion a frictional coefficient matrix. Retardation spectra can then be obtained by numerically solving for the eigenvalue spectrum on a computer. Results show that the viscoelastic retardation spectra and maximum retardation times of those copolymers vary as a function of the number of side chains, their lengths and the spacings between them. The model is restricted to bulk homogeneous copolymers, or those copolymers dissolved in appropriate solvents without microphase separation. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Dec 01, 1978
- Accession Number
- ADA062662
Entities
People
- David Soong
- Mitchel Shen
Organizations
- University of California, Berkeley