Synthesis of High Molecular Weight Para-Phenylene PBI
Abstract
A new class of aromatic polyamide materials has recently become commercially available which exhibit super mechanical properties. The properties are primarily connected to the all-'para' aromatic structure of these polyamides. This report is concerned with the synthesis of an all-'para' aromatic heterocyclic polymer system. A study has been conducted on the use of various monomers and polymerization conditions to obtain high molecular weight poly(1,7-dihydrobenzo(1,2-d:'4,5-d) diimidazole -2, 6-diyl)-1, 4-phenylene). The polycondensation of 1,3-diamino -4, 6-(p-toluenesulfamido) benzene with terphthalic acid and also the homopolymerization of a series of AB-monomers has resulted in a polymer with intrinsic viscosities as high as 5.0. The resulting high molecular weight rod-like all-'para' PBI, with its high temperature capability and its ability to crystallize, shows great promise as a thermally stable material which should exhibit superior mechanical properties.
Document Details
- Document Type
- Technical Report
- Publication Date
- Nov 01, 1974
- Accession Number
- ADB001643
Entities
People
- Fred E. Arnold
- Robert L. Kovar
Organizations
- Air Force Research Laboratory