Processable Precursors to High Performance Liquid Crystalline Polymers.
Abstract
Processable precursor polymers to aramids, poly(imino1,4- phenyleneiminocarbonyl-1,4 phenylenecarbonyl) and poly(imino-1,3- phenyleneiminocarbonyl-1,4-phenylenecarbonyl), were prepared and studied. The precursor polymers were made from the reaction of 2,5-dichlorobicyclo2.2. 2octane-1,4dicarbonyl chloride or 2,5diacetoxybicyclo2.2.2octane-1,4- dicarboxylic acid. The polymeric precursors were subsequently converted in approximately 98% - 100% yields, via dehdrohalogenation and retro Diels-Alder reactions to the corresponding aramids by refluxing in 1M solution of potassium hydroxide or sodium hydroxide, or by bulk pyrolysis using aromatization catalysts, such as, ZnCl 2 and dichlorobenzene sulfonic acid. Only the p- phenylene precursor polymer exhibited liquid crystal characteristics in solution. Thermal properties were examined and tensile properties will be determined In a future study.
Document Details
- Document Type
- Technical Report
- Publication Date
- Oct 01, 1992
- Accession Number
- ADA260466
Entities
People
- I. I. Harruna