Effect of Marcromolecular Structure on Physical Properties of Polymers.
Abstract
A number of different types of investigations in thermodynamic and dynamic (relaxational) areas were undertaken to learn the effect of the chemical and sterochemical structure of polymers on properties. A low temperature heat capacity study of ultra-high molecular weight polyethylene appears to have shed some light on the long-standing controversy regarding the glass transition temperature of this polymer. Of particular interest was the comparatively rare case of alleged compatibility of miscibility exhibited by poly (2,6-dimethyl phenylene ether) (PPO) with polystyrene (PS). In another series of investigations PPO itself was studied by calorimetric, dynamical mechanical and dielectric techniques. A modification of the technique of light scattering from dilute macromolecular solutions was used to determine polymersolvent diffusion constants of synthetic macromolecules. Other studies included an examination of the effect of stereoregularity on the glass temperature in disubstituted vinyl polymers and a theoretical study of the entropy of fusion of crystalline polymers. (Author)
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1972
- Accession Number
- AD0735395
Entities
People
- Frank E Karasz
Organizations
- University of Massachusetts Amherst