Vinylpyridinium Ionomers. 2. Styrene-Based ABA Block Copolymers

摘要

The thermal and dynamic mechanical behavior of styrene-4-vinylpyridinium ABA block ionomers was investigated as a function of ion content and method of preparation. Only one tg, associated with the glass transition of the polystyrene phase, was observed in DSC experiments. The glass transition of the ionic domains was detected by dynamic mechanical measurements as a shoulder on the low-temperature side of the polystyrene. This unexpectedly low value for the Tg of the ionic domains was attributed to plasticization by water. The presence of water in these ionomers was related to the method of preparation of the materials. Keywords: Reprints.(JES)