Preparation and rheological properties of P(AN-MA-AMPS)copolymer
A ternary copolymer of poly(acrylonitrile-methyl acrylate-2-acrylamido-2-methylpropane sulfonic acid)(P(AN-MA-AMPS))was prepared using AN,MA and AMPS as reaction monomers and azodiisobutyronitrile(AIBN)as an initiator by solu-tion polymerization.The effects of reaction conditions on the monomer conversion rate and relative molecular mass of the products were studied for the polymerization system with an AN/MA/AMPS mass ratio of 97.5:1.5:1.0.The rheological properties of P(AN-MA-AMPS)solutions were studied at different P(AN-MA-AMPS)concentrations.The results showed that the monomer conversion rate of copolymerization reaction increased with the increase of reaction time,reaction temperature,monomer concen-tration and initiator dosage;the relative molecular mass of P(AN-MA-AMPS)increased with the increase of reaction time,first increased and then decreased with the increase of monomer concentration,and decreased with the increase of reaction temperature and initiator dosage;the optimal copolymerization reaction conditions were a total monomer mass fraction of 22%,an initiator mass fraction of 0.6%,a reaction temperature of 60℃,and a reaction time of 12 h;and the apparent viscosity,storage modulus and loss modulus of P(AN-MA-AMPS)solution decreased with the increase of temperature and increased with the increase of sol-id content of the solution.
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