[C:1]([NH2:5])(=[O:4])[CH:2]=[CH2:3].[CH2:6]([N:9]([CH2:18][CH:19]=[CH2:20])[CH:10]=[CH:11][CH:12]=[C:13]([C:16]#[N:17])[C:14]#[N:15])[CH:7]=[CH2:8]>C(O)C>[C:1]([NH2:5])(=[O:4])[CH:2]=[CH2:3].[CH2:6]([N:9]([CH:10]=[CH:11][CH:12]=[C:13]([C:14]#[N:15])[C:16]#[N:17])[CH2:18][CH:19]=[CH2:20])[CH:7]=[CH2:8]In a 10 liters flask, supplied with stirrer, reflux and internal thermometer, 230 g. of acrylamide and 120 g. of 3-diallylaminoallylidenemalononitrile (A) were dissolved in 4 liters of ethanol at 96%. The mixture temperature was increased to 78° C. under agitation. 8 g. of 2,2'-azobisisobutyrronitrile (AZBN) were introducted at this point. After 10 minutes, a yellowish product began separating. The reaction was continued under those conditions for 14 hours. The mixture was then cooled at room temperature; the separated product was filtered, washed with diethyl ether and vacuum dried at 50° C. The yield of the solid yellowish product was 320 g., with 8% aminoallylidenemalononitrile units in weight. The IR, spectrophotometric analysis and the TLC confirmed for the polymer a structure with allylidenemalononitrile groups. The solution at 6% in 70/30 water/ethanol diluted 1:2000 in water showed an optical density of 0.7 at 382 nm.
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