High Strength, Thermally Stable Polymeric Fibers.

摘要

This work is concerned with the synthesis of specifically ordered heterocyclic polymer systems for evaluation as high tenacity fiber candidates. Specifically sought are good mechanical properties, high energy absorption (work-to-break) and high temperature performance. The primary structural criteria for polymer order are: Chain growth which describes a straight line; The absence of bulky pendant groups; and Capability for approaching a planar structure and interchain bonding. These structural features, which are primarily responsible for providing enhanced thermal and mechanical capability relative to non- oriented counterparts, at the same time render the polymer system highly intractable. The exception to these criteria appears to be the formation of the sought rod geometry through appropriate solvation of macromolecules containing flexible links to obtain for instance a helix. Poly- 2,5(6)benzimidazole (AF-R-56) is considered in some detail. (Author modified-PL)