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- W2023267377 abstract "The polymerization of N-isopropylacrylamide in aqueous solution was studied using a redox catalyst consisting of ammonium persulfate and sodium bisulfite. The purpose of the study was to relate the rate of polymerization and the molecular weight of the resulting polymer to the pH of the system and the catalyst concentration. It was observed that the rate of polymerization was very sensitive to the pH of the system. A plot of rate versus pH for a given catalyst concentration showed a maximum rate at a pH of 6.5. For a given catalyst concentration, the viscosity (molecular weight) of the polymer formed was independent of the rate of polymerization when the pH was 6.5 or less. Above a pH of 6.5 the viscosity was inversely proportional to the rate of polymerization. These results, together with data obtained on polymerization rates and polymer viscosities as functions of catalyst concentration at various pH values, indicate that the viscosity of the polymer formed is primarily a function of bisulfite ion concentration." @default.
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- W2023267377 date "1957-09-01" @default.
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- W2023267377 title "Effect of pH on homopolymerization of N-isopropylacrylamide" @default.
- W2023267377 doi "https://doi.org/10.1002/pol.1957.1202511102" @default.
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