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Molecular weights of polymer residues from the thermal degradation in vacuum of two polymethyl methacrylate samples, one polymerized with benzoyl peroxid e and the other without an y initiator, have been obtained over wide extents of degradation at various constant temperatures. A linear relation, dependent upon the temperature but i ndependent of rate of volatilization and rate of change of l /M w , is found when log R is plotted against l /M w • (R = ratio of residue weight to originaldoi:10.6028/jres.056.009 fatcat:24lrkenetfecpp3gxxemke4skq