Chemistry: physical processes – Physical processes – Crystallization
Patent
1980-08-29
1981-12-22
Schor, Kenneth M.
Chemistry: physical processes
Physical processes
Crystallization
232303, 324321, 422 78, G01N 2408
Patent
active
043068782
ABSTRACT:
A method for selecting a flame retardant for a polymer comprises using cross polarization and magic-angle sample spinning techniques to record well resolved .sup.31 P and .sup.13 C nuclear magnetic resonance spectra of the polymer before and after ignition; recording .sup.31 P and .sup.13 C NMR spectra of the combination of polymer and a known flame retardant before and after ignition; characterizing the chemical and physical changes that occur in the flame retardant and the polymer upon ignition and thereby determining the chemical basis by which the known flame retardant is operating and using that knowledge to select another flame retardant that will be effective for use with the polymer.
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ASTM D2863-70; May 8, 1970; "Standard Method of Test for Flammability of Plastics Using the Oxygen Index Method"; pp. 719-722.
Rev. Sci. Instrum., vol. 48, No. 10 (Oct. 1977); "NMR Probe for Combined Homonuclear Multiple Pulse Decoupling & Magic Angle Spinning"; Pembleton et al.; pp. 1286-1289; American Institute of Physics.
Journal of Applied Physics; vol. 22, No. 6 (6/1951); Nuclear Magnetic Resonance Study of Transitions in Polymers; Holroyd et al.; pp. 696-705.
Brown Charles E.
Wilkie Charles A.
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