POLY(SULFOBETAINE)S AND CORRESPONDING CATIONIC POLYMERS .7. THERMAL-DEGRADATION OF COPOLYMERS DERIVED FROM POLY(ACRYLAMIDE CO-N,N-DIMETHYLAMINOPROPYLMALEIMIDE)

The copolymer prepared by copolymerizing acrylamide and maleic anhydri de was imidized with N,N-dimethylaminopropylamine. The obtained acryla mide-N,N-dimethylaminopropylmaleimide (ADMAPM) copolymer was then reac ted with propane sultone to yield an acrylamide-N,N-dimethylmaleimidop ropyl ammoniopropane sulfonate (ADMMAPS) copolymer or then reacted wit h methyl iodide to yield a poly(methyl iodide quaternized acrylamide-N ,N-dimethylaminopropyl maleimide) copolymer [poly(MIQADMAPM)]. The kin etic parameters, such as the reaction order, the activation energy, an d the preexponential factor, of the thermal degradation were evaluated from thermal gravimetric curves for these two copolymers. The activat ion energy and preexponential factor of the poly(ADMMAPS) were higher than those of poly( MIQADMAPM) for Ozawa's method and van Krevelen's m ethod. (C) 1997 John Wiley & Sons, Inc.