... Introduction: Polyacrylamide,addreviation PAM,is a glassy solid,apt to water absorbing;the speed of absorbing water varies with different ... power at 210οC without oxygen.It could be made to four series,e.g.,non-ion,cation,anion and ... widely used in the field of oil extraction,mining selection,coat washing, metallurgy, chemical, papermaking,sugarrefining,pharmaceutical,environment protection, ...