Static light scattering study of fluorocarbon-modified ampholytic acrylamide ionomers
- Univ. of Massachusetts, Lowell, MA (United States)
A series of water-soluble acrylamide ionomers containing small amounts of ampholytic and hydrophobic sites were investigated in dilute aqueous and aqueous salt solutions via static light scattering methods. Elemental analysis verified the ampholytic nature of the polymers while the ion/hydrophobe content was found to be much lower than what was supplied in the feed. Both the molecular weight and radius of gyration exhibited increases with increasing comonomer content to maximum values at 2.5-3.0 mole%. Mw and Rg increased further in 1 M aqueous NaCl and dropped to previous levels in 3 M NaCl. The radius of gyration exhibited sizable increased at 45 and 70{degrees}C in aqueous solution, less so in 1 M NaCl. Dilute aqueous salt expanded the molecules through shielding of the ionic sites, while concentrated aqueous salt increased hydrophobic aggregation decreasing the size of the polymers. At higher temperatures salt ions failed to reach the ionic sites and fluorocarbon aggregation is thought to be responsible for the low radii of gyration.
- OSTI ID:
- 141539
- Report Number(s):
- CONF-930304--
- Country of Publication:
- United States
- Language:
- English
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