1H NMR Analysis of Long-Chain-Branched Strong Polyelectrolytes Obtained by Vinyl/Divinyl Monomer Copolymerization in Aqueous Medium |
| |
| Authors: | J. Podešva J. Spěváček P. Kratochvíl M. Netopilík |
| |
| Affiliation: | 1. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Prague , Czech Republic podesva@imc.cas.cz;3. Institute of Macromolecular Chemistry, Academy of Sciences of the Czech Republic , Prague , Czech Republic |
| |
| Abstract: | Statistical long-chain branching occurring during the free-radical polymerization of the system sodium 4-vinylbenzenesulfonate (SSNa) and N, N′-methylene-bis(acrylamide) (MBAA) in aqueous medium was studied by ¹H NMR spectroscopy and SEC. The former method yielded the degree of conversion and the content of the three monomer units in the chain, i.e., SSNa, MBAA with pendant vinyl groups, and MBAA as branching points. It was found that the number of individual monomer units per a total of 1000 monomer units does not perceivably change with the degree of conversion and only slightly increases with increasing ratio MBAA/SSNa in the feed. |
| |
| Keywords: | Long-chain branching NMR Polyelectrolytes SEC |
|
|
