MAPTACMethylenebis-Acrylamide-Methacrylamido-Propyl Trimethyl-Ammonium Chloride Co-Polymer
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In contrast, cationic acrylamide copolymers containing amide monomers such as APTAC and MAPTAC are reasonably stable up to a pH of 9-10.
The Tanaka team conducted the experiment after adding a chemical compound with a positive charge, called MAPTAC, into a jelly-like substance called NIPA gel, which shrinks when temperatures rise above 35 C and swells when it drops below that.
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.