MAPTACMethylenebis-Acrylamide-Methacrylamido-Propyl Trimethyl-Ammonium Chloride Co-Polymer
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In batch copolymerlzations of acrylamide with MAETAC ([r.sub.1](AM) = 0.25, [r.sub.2](MAETAC) = 1.71) or MAPTAC ([r.sub.1] (AM) = 0.57, [r.sub.2](MAPTAC) = 1.13), the more reactive MAETAC and MAPTAC monomers react faster with their own monomers than with acrylamide.
In contrast, cationic acrylamide copolymers containing amide monomers such as APTAC and MAPTAC are reasonably stable up to a pH of 9-10.
On closer analysis, the Tanaka team found the gel reacted to each of the negatively charged molecules, capturing or releasing pyranine depending on interaction with three or four positively charged MAPTAC monomers.