Polymer Structures and Properties. Part I. Thermally Stable Polymers.
Abstract
A new cone and plate rheometer is described and evaluated. The new instrument is intended to measure rheological properties of concentrated solutions of BBB in strong acids. It can be used to study the shear stress as a function of shear rate and time of shearing, as well as the deformation in response to an applied shear stress. Studies of several solutions with the new instrument are discussed. Dilute solution light scattering and viscometry on fractions for BBB polymer treated with fuming sulfuric acid are described. This treatment is believed to cause intrachain cyclization leading to an inflexible coil polymer. Light scattering studies on films of BBB and BBL reveal even more supra-molecular structure than was anticipated. These data are considered in terms of available theories. Studies of the translational diffusion constant as determined by Rayleigh line width spectroscopy have been initiated with solutions of BBB in methane sulfonic acid. A general discussion of an equilibrium theory for exclusion chromatography is discussed. This theory is applied to linear and branched flexible chain polymers, to rigid rodlike molecules, and to rodlike molecules with one flexible link in the chain. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Feb 01, 1971
- Accession Number
- AD0881802
Entities
People
- C. A. Powell
- E. F. Casassa
- G. C. Berry
- S. M. Liwak
Organizations
- Carnegie Mellon University