Microphase Separation in Organic Polymers Containing Ions
In recent years there has been a considerable amount of interest in a new class of polymeric materials consisting of copolymers of olefins and carboxylic acids, the hydrocarbon being the major constituent. It has been found that the properties of these materials undergo profound alterations when the carboxylic acid groups are neutralized to form various salts. In particular, the optical clarity, tensile strength, impact resistance and melt viscosity greatly increase upon neutralization. Studies carried out on such materials in these laboratories1,2 as well as others3 indicate that the phenomenon of microphase separation occurs with the dispersed phase consisting of ionic aggregates or domains, probably less than 100A in size. A related system, consisting of polyethylene modified by the inclusion of phosphonic acid side groups has been recently studied1,4 and apparently exhibits microphase separation at high phosphonic acid contents even without ionization. In this case the dispersed phase consists of hydrogen bonded aggregates of phosphonic acid groups.
KeywordsSodium Salt Apparent Viscosity Complex Viscosity Phosphonic Acid Microphase Separation
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