Role of Polymer Science in Developing Materials for Phonograph Discs
An introduction to the science of "flow and deformation" of vinyl chloride-vinyl acetate copolymers is given, along with the equipment used to study the theological parameters. The molding of phonograph discs is related to the melt viscosity and melt elasticity. A correct balance of melt viscosity and elasticity appears to be a prerequisite for the successful molding of discs. It is shown that the molecular structure of polymers used in the phonograph record compounds has a significant effect on the melt flow and dynamic properties and, thus, the processing of the compounds. It is suggested that polymer rheology is a very useful study in the development of materials and to understand such problems as improper molding, warpage of discs, wear life of discs, and pressing cycle times.
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