二乙基二烯丙基氯化铵与丙烯酰胺、丙烯酸共聚竞聚率

二乙基二烯丙基氯化铵;丙烯酰胺;丙烯酸;共聚合;竞聚率

Copolymerization Reactivity Ratios of Diethyldiallylammonium Chloride with Acrylamide or Acrylic Acid

The radical copolymerizations of diethyldiallylammonium chloride(DEDAAC)with acrylamide (AM),acrylic acid(AA)or sodium acrylic acid(AANa)were carried out in aqueous solutions using persul- fate ammonium(APS)as initiator.The compositions of these copolymers at various monomer molar ratios and with low conversion were determined by elemental analysis and the corresponding composition curves were plotted.The reactivity ratios of monomers in copolymerization were also obtained by Kelen-Tudos method.The results show that the values of reactivity ratios r and r are 0.31 and 5.27 for DEDAAC with AM,0.28 and 5.15 for DEDAAC with AA,and 0.40 and 3.97 for DEDAAC with AANa.The molar fractions of the unit of DEDAAC in copolymers are lower than those in monomer mixtures and the reactivity of DEDAAC is far lower than those of AM,AA and AANa,and this is probably due to the strong chain transfer,self inhibition,and the large steric hindrance of DEDAAC,as well as the large end effect and penultimate effect between the growing chains and DEDAAC.For each system above,the product of the reactivity ratios of the two monomers is above 1,therefore,the copolymerization for DEDAAC with AM,AA or AANa is non-ideal copolymerization and the products are approximately random copolymers.