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IMPROVEMENT OF MECHANICAL AND THERMOMECHANICAL PROPERTIES OF PLASTICS BY THE USE OF ACTIVE FILLERS
LIBRARY OF CONGRESS WASHINGTON D C AEROSPACE TECHNOLOGY DIV
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A method of introducing active fillers, such as bentones, into polymers to improve mechanical and thermomechanical properties is reported. Incorporation of a filler suspended in a solvent into a polymer solution is described. The effect produced by active i.e., increasing mechanical strength of the polymer by orienting the molecules and inactive fillers were compared. Hardness testing, thermal analysis, plotting of thermomechanical curves, and other physical tests indicated definite improvement of mechanical and thermomechanical properties of polymethylmethacrylate filled with active fillers. Among other improvements in physical properties, the viscousflow point and the thermal-decomposition point of specimens were approximately 50 to 20 degrees higher, respectively, than the corresponding points of the unfilled polymer. Polymethylmethacrylate filled with chalk displayed some degradation in physical properties. Author
APPROVED FOR PUBLIC RELEASE