A new kind of physical gels was prepared using the mixtures of poly(vinyl alcohol) (PVOH) and high melting ionic liquid (IL), 1-ethylpyridinium bromide. As the IL content was increased, the stiffness of the mixtures decreased sharply while extensibility increased significantly, exhibiting rubber-like elasticity. X-ray scattering studies indicated that IL is highly miscible with PVOH and forms a new amorphous phase that coexists with the crystalline phase of PVOH. Thermal analysis showed that both melting temperature (Tm) and glass transition temperature (Tg) decreased noticeably as IL content increased. The peak intensity associated with melting transition decreased as well, indicating decreased overall crystallinity. Due to the highly suppressed Tg of the mixtures, thermal flow can be induced easily by mild heating. Noticeable healing effect via thermal flow was observed for scratched films prepared from IL-rich mixtures, suggesting that these mixtures could be used for thermally remendable coating systems.
Proceedings Title: Conference Proceedings of the 2010 AIChE Annual Meeting
Conference Dates: November 7-12, 2010
Conference Location: Salt Lake City, UT
Conference Title: 2010 AIChE Annual Meeting
Pub Type: Conferences
polymer, gel, ionic liquid, self-healing, coating, blends, mechanical properties, morphology