Accession Number:

ADA175403

Title:

Solution Properties of Ampholytic Ionomers in Organic Solvents.

Descriptive Note:

Final rept. 1 Jun 83-31 May 86,

Corporate Author:

LOWELL UNIV MASS DEPT OF CHEMISTRY

Report Date:

1986-09-01

Pagination or Media Count:

11.0

Abstract:

The ion-pair comonomer, 2-methacryloyloxyethytrimethylammonium-2-metha-cryloyloxyethanesulfonate METMA.MES was copolymerized in dimethyl formamide medium using a free radical initiator AIBN with the following methacrylate monomers methyl, ios-butyl, t-butyl, n-butyl, t-butylaminoethyl, n-hexyl and n-lauryl methacrylates. The ion content of the copolymer was kept below 10 mole percent. This combination of ionic and non-ionic monomer units in a polymer yields ionomeric materials. Except for methyl methacrylate ionomers, all the other ionomer dissolved in the solvent of interest a 21 molar ratio mixture of 2-methyl-cyclohexanol and isopropylamine Liquid A. The Brookfield viscosity measured with 5 wv solution of these ionomers showed that all the ionomers behaved as Newtonian fluid, with the exception of n-lauryl methacrylate ionomers. Even though the Brookfield viscosity was nearly three times larger if the ionomer yield was kept below 50 , the solution did not have non-Newtonian properties. The molecular weights of these ionomers were found to be of the order of 2 - 30,000. To increase the molecular weight of the ionomers, two emulsion polymerization techniques, viz, self-emulsion and regular emulsion, were used. In the self-emulsion technique the ionic monomer itself acts as the emulsifier. Ionomers synthesized by the self-emulsion technique did not dissolve in Liquid A. When an external emulsifier, Triton X-405, was used, high molecular weight ionomers 1,000,000 were obtained, and a l wv solution of these ionomers showed non-Newtonian behavior.

Subject Categories:

  • Polymer Chemistry
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE