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There is, at present, an on-going electrochemical testing program to evaluate the glass-reinforced polyester compound. An 8.3kWh submodule battery case and related store components were built of this material. Data from operation of this system will be used to reach a decision on the acceptance of polyesters. POLYETHYLENES Another compound showing promise for use as the battery case material is a high density polyethylene. Such compounds are prepared by a coordination catalyst method under low pressure, <1500 psi, polymerizations. This produces a linear product with very few side chains, and densities of 0.955 to 0.970 g/cc. The greater stability of the high density polyethylenes is attributed to the decreased branching and thus decreased availability of ethyl and butyl groups for reaction. The main polymer structural features which influence the properties of poly ethylene are: degree of branching in polymer, average molecular weight, and molecular weight distribution. The increase in density improves the tensile strength, hardness, and chemical resistance; as well as lowering permeability of the compound to liquids and gases. Higher molecular weight compounds also have improved chemical and impact resistance. However, they are harder to process becauseoftheirhighermeltviscosities. Apolyethylenecompoundcouldbeused most easily for injection-molding. Its low cost and mechanical properties, par ticularly weldability, make it an attractive alternate to Kynar. Studies to date, using an extruded polyethylene formulation, continue to show some occurrences of blistering. Through the cooperation of the manufacturer, testing is planned for a formulation using higher levels of a single stabilizer of low volatility. Various other possible causes of this blistering have been pursued. VITONS AND PERFLUOROELASTOMERS The major effort in the area of materials has been directed toward the development and qualification of the rigid plastic components in the battery. There are, of course, non-rigid components to be considered as well. These include the gasket and filter materials, and flexible tubing. Viton* fluoroelastomers are presently being used in the laboratory for gasketing. Two types of Viton are available: Type A and Type B. Viton A is a copolymer of vinylidene fluoride and hexafluoro- propylene. Viton B is a terpolymer of vinylidene fluoride, hexafluoropropylene, *DuPont Trademark 33-11PDF Image | Development of the Zinc-Chlorine Battery for Utility
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