Three basic conditions for preparation of alternating copolymer with narrow molecular weight distribution were derived from the element kinetic equations of binary radical copolymerization. Using maleimide (MI) and at...Three basic conditions for preparation of alternating copolymer with narrow molecular weight distribution were derived from the element kinetic equations of binary radical copolymerization. Using maleimide (MI) and atropic acid (ATA) as model monomer pairs and dioxane as the solvent the alternating copolymer with molecular weight distribution in the range of 1.09-1.20 was prepared successfully by charger transfer complex (CTC) mechanism in the presence of benzoyl peroxide at 85 °C. The monomer reactivity ratioesr 1(MI) = 0.05±0.01 andr 2(ATA) = 0.03 ± 0.02 were measured. The alternating copolymerization was carried out through formation of a contact-type CTC and then alternating addition of MI and ATA monomers. The molecular weight of the copolymers is nearly independent of the feed ratio in a Iarge range and the polymerization rate dropped with an increase in ATA in feed ratio.展开更多
基金Project supported by the National Natural Science Foundation of China (Grant No. 29634010-3)Doctor Training Foundation of State Education Ministry of China.
文摘Three basic conditions for preparation of alternating copolymer with narrow molecular weight distribution were derived from the element kinetic equations of binary radical copolymerization. Using maleimide (MI) and atropic acid (ATA) as model monomer pairs and dioxane as the solvent the alternating copolymer with molecular weight distribution in the range of 1.09-1.20 was prepared successfully by charger transfer complex (CTC) mechanism in the presence of benzoyl peroxide at 85 °C. The monomer reactivity ratioesr 1(MI) = 0.05±0.01 andr 2(ATA) = 0.03 ± 0.02 were measured. The alternating copolymerization was carried out through formation of a contact-type CTC and then alternating addition of MI and ATA monomers. The molecular weight of the copolymers is nearly independent of the feed ratio in a Iarge range and the polymerization rate dropped with an increase in ATA in feed ratio.
