Ionic Forces in Polymers. Some Properties of the Polyphosphates in the Glass Transition Region

摘要

The effect of ionic forces on the properties of polymers is reviewed with particular reference to the polyphosphates in the glass transition region. First, the work on the glass transition is discussed, specifically with regard to its dependence on the molecular weight, the nature of the chain end, and the nature of the counterion, and the applicability of various theories is demonstrated. Next, viscoelasticity of ionic polymers is reviewed, with particular emphasis on the distribution of relaxation times, ion-catalyzed bond interchange reactions of polymers are presented, with particular reference to the separation of multiple mechanisms occurring simultaneously with comparable relaxation times, as well as the mechanistic and kinetic details of the interchange process. The action of cations as crosslinks in anionic polymers is also reviewed. (Author)