Polymer Structures and Properties
Abstract
Experimental studies on the heterocyclic polymer BBB, obtained by the condensation reaction of 3,3'diaminobenzidine with naphthalene-1,4,5,8- tetracarboxylic acid, are described. Fractionations based on exclusion chromatography and selective solubility are discussed. Dilute solution properties of these fractions including light scattering and viscometry are presented. The viscosity of concentrated solutions of the fractions in methane sulfonic acid is studied as a function of concentration and molecular weight of the polymer, and temperature. It is concluded that the solutions have a high entanglement density, even at relatively low polymer concentration, and that the segmental friction factor increases very fast with increasing polymer concentration. The latter effect is probably associated with the inability to form homogeneous solutions of BBB at high concentration. Freezing temperature studies on solutions of a model compound of the BBB repeat unit are described. These show the compound to be diprotonated in sulphuric acid. The design of a cone and plate viscometer for rheological studies on BBB solutions is discussed. Dilute solution properties on a candidate 'rod-like' polymer are presented. These show that the anticipated rod-like character of the polymer is only imperfectly realized.
Document Details
- Document Type
- Technical Report
- Publication Date
- Jan 01, 1970
- Accession Number
- AD0865808
Entities
People
- E. F. Casassa
- G. C. Berry
- J. S. Burke
- S. M. Liwak
Organizations
- Carnegie Mellon University