Polymerization DADMAC/acrylamide

DADMAC/Acrylamide Copolymer (75/25 Wt %)-Emulsion Polymerization. The following were added to the reaction vessel 64.4 parts benzene, 15 parts DADMAC, 5 parts acrylamide, 13.5 parts deionized H20, and 2 parts sodium octyl phenoxyethoxy-2-ethanol sulfate. The vessel was purged for 1 hr with N2 at 50° 1°C after which 5 ppm Fe+2 and 2 X 10"3 mol f-butylperoxypivalate/mol monomer were added. The temperature was held at 50° 1°C for 20 hr. The product, isolated via acetone precipitation, was found to be a DADMAC/acrylamide copolymer (60/40 wt %). 

DADMAC/Acrylamide Copolymer (75/25 Wt %)-Solution Polymerization. This product was synthesized in a manner similar to the solution homopolymerizations of DADMAC and AMBTAC. The product, isolated via acetone precipitation, was found to contain 60% DADMAC and 40% acrylamide. 

In the present work, the copolymerization of acrylamide (AAM) with three cationic comonomers DADMAC, dimethylaminoethyl methacrylate (DMAEM), and dimethylaminoethyl acrylate (DMAEA) (the latter two qua-temized with methyl chloride) was investigated. The reactivity ratios were determined by using continuous solution polymerization with the error-invariables method, a technique that provides estimates of the joint confidence... 

DADMAC 13C, for example, can be readily polymerized imder these cyclopolymerization conditions to yield PolyDADMAC in which a structure composed of 5-membered A -heterocycles predominates. 13C will readily polymerize at 35°C employing ammonium persulfate as the initiator. 13C is readily copolymerized with other diallyl monomers, with acrylamide monomers such as 28C or diacetone acrylamide, or quaternized 1C. Extensive reviews of cyclopol5mieriza-tion and cyclocopolymerization can be found in Reference 188. Recent examples of cyclocopolymerization with sulfobetaine (14C) and carboxybetaine (15C) diallyl ammonium monomers are given in References (188-191). 

Subsequently, there have been many improvements to the dispersion polymerization process that have allowed for AM/ AETAC and AM/DADMAC cationic, AM/sodium aaylate anionic, acrylamide nonionic, and AM//V7V-dimethyl-/V-acryloyloxyethyl-/V-(3-sulfopropyl) ammonium betaine polymeric dispersions [16, 38-41]. These improvements, such as the development and utilization of new dispersants, the use of polymeric seeds to fecilitate precipitation, optimization of... 

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