Solution Properties of Ampholytic Ionomers in Organic Solvents.
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 2:1 molar ratio mixture of 2-methyl-cyclohexanol and isopropylamine (Liquid A). The Brookfield viscosity measured with 5 w/v % 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 w/v % solution of these ionomers showed non-Newtonian behavior.
Document Details
- Document Type
- Technical Report
- Publication Date
- Sep 01, 1986
- Accession Number
- ADA175403
Entities
People
- A. C. Watterson
- J. C. Salamone
- P. Elayaperumal