In the aqueous two-phase copolymerization of acrylamide and 2-methylacryloylxyethyl trimethyl ammonium chloride (DMC), double phase separation was first observed. To fix the critical points, spectrophotometer was employed to detect the transmittance of copolymerization system on-line. The transmittance curves showed three intervals. At 1st interval, transmittance keeps constant at the beginning, and then drops off quickly. At 2nd interval, transmittance stops dropping and begins to increase. And at 3rd interval, transmittance stops to keep constant for a moment, and then drops rapidly to nearly zero. When acrylamide was copolymerized with different monomers, the double phase separation process can be observed only for DMC and acryloylxyethyl trimethyl ammonium chloride (DAC). It confirms that the double phase separation is attributed to the cationic nature of DMC and DAC. And then after a series of valid experiments, mechanism of the double phase separation process of the aqueous two-phase copolymerization system was brought up.

Mechanism of double phase separation of aqueous two-phase copolymerization of acrylamide and quaternary ammonium cationic monomers

245th National Meeting (2013)

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