Condensation Polymers with Controlled Structure.
Annual rept. 1 Aug 85-31 Jul 86,
MASSACHUSETTS INST OF TECH CAMBRIDGE DEPT OF CHEMICAL ENGINEERING
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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 NMPTHF 101, 3ww 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 poly2,6-dichloro-p-phenyleneterephthalamide, poly2-nitro-p-pheynleneterephthalamide, and poly2-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, poly2,6-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.
- Polymer Chemistry