Vinylpyridinium Ionomers. 1. Influence of the Structure of the Ion on the State of Aggregation in Random Styrene-Based Systems

摘要

The thermal and dynamic mechanical properties of random styrene ionomers containing various vinylpyridinium groups have been examined. The properties of the materials were found to be independent of the structure of the ion. The glass transition temperatures of these ionomers were found to increase regularly with increasing ion content, at a rate of about 3.5 C/(mol % ions). In contrast with styrene ionomers with pendant anionic groups studied before, the vinylpyridinium ionomers showed only one peak in their loss tangent curves, associated with the Tg of the matrix. The absence of a second, higher temperature peak suggest the absence of clusters in these ionomers, at least at temperatures above their Tg. The storage modulus curves are in agreement with this conclusion. Reprints. (jes)