Condensation Polymers with Controlled Structure.
Abstract
The polymerization procedure that had been used in the first year of funding was improved dramatically during the current period. A homogenous condensation system for the Modified Schotten-Baumann reaction at ambient temperatures has been found (NMP:THF = 10:1, +3%w/w LiCl) that routinely yields polymers with a degree of polymerization sufficient to form fibers and that allows for the slow addition of one of the reagents to the others without side reactions. We have now synthesized poly(2,6-dichloro-p-phenyleneterephthalamide), poly(2-nitro-p-pheynleneterephthalamide), and poly(2-methoxy-p-phenyleneterephthalamide) with the new system. It has been determined, both theoretically and experimentally, that they form liquid crystalline solutions at concentrations similar to those of the non-substituted polymer (i.e., Kevlar). Thus, far, poly(2,6-dichloro-p-phenyleneterephthalamide) has been synthesized in ordered and random forms and we are devising new NMR techniques to quantitatively determine this order. Solubility differences between the ordered and the random chains are striking.
Document Details
- Document Type
- Technical Report
- Publication Date
- Aug 04, 1986
- Accession Number
- ADA172283
Entities
People
- Frank T. Gentile
- Ulrich W. Suter
- Werner R. Meyer
Organizations
- Massachusetts Institute of Technology