Abstract
Studies of fast ion conduction in solid amorphous polymer-salt mixtures have increased rapidly in the last decade since it was demonstrated that their application in dry battery manufacture was feasible.
The most successful type of polymer matrix found so far is poly(ethylene oxide) PEO which can dissolve a wide range of salts to form solid homogeneous solutions. A major drawback in these systems is that PEO tends to crystallise readily and as ionic conduction takes place in the amorphous regions of the polymer a reduction in the crystalline content of the host polymer is desirable, if reasonable conduction levels are to be attained at ambient temperatures.
One way of achieving this is to synthesise comb-shaped polymers with short side chains of poly(ethylene glycol) or poly(propylene glycol) (PPG) which do not crystallise but are long enough to coordinate with the metal cations of the added salt.
Structures with this architecture based on poly(methacrylic acid), poly(itaconic acid) and polyphosphazene backbones with either PEO or PPG side chains have been prepared by several groups of workers. These form amorphous solutions with a range of alkali metal salts and conductivity levels of up to 10-3 Scm-1 have been recorded in several systems.
The factors influencing ionic conductivity in these comb branch systems such as salt selection, glass transition temperatures, and temperature of measurement, will be discussed with particular reference to the polymers based on poly(itaconic acid), and ethylene oxide macromers.
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Cowie, J.M.G. (1988). Fast Ion Conduction In Comb Shaped Polymers. In: Lemstra, P.J., Kleintjens, L.A. (eds) Integration of Fundamental Polymer Science and Technology—2. Springer, Dordrecht. https://doi.org/10.1007/978-94-009-1361-5_6
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DOI: https://doi.org/10.1007/978-94-009-1361-5_6
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