Fractal kinetics of radical polymerization of dimethyl diallyl ammonium chloride

Abstract

ABSTRACT:The proposed technique allows determination of variation in a macromolecular coil structure of dimethyl diallyl ammonium chloride, characterized by its fractal dimension, during polymerization. It is shown that this one factor, unaccounted for in conventional theories, determines the most important characteristics of a polymerization process: rate, output of a finite product, and molecular weight. Further, the methods of fractal kinetics allow the quantitative description of synthesis of polymers and, in particular, give the correct shape of the conversion degreetime kinetic curve.

Preparation and characterization of poly(dimethyldiallylammonium chloride) with high molar mass using high purity industrial monomer

“…2,3 It is especially useful in municipal engineering where it is used as a coagulant and flocculant in raw and waste water treatment. 4,5 Therefore, new developments on its preparation, 6,7 application, 8,9 reaction mechanism, [10][11][12] and the relationships between structure and properties [13][14][15][16] have being hot topics all the time. Figure 1(a,b) shows the main structural units of the linear polymer PDMDAAC reported in the literature; Figure 1(c) shows a segment of a pendant double bond that occurs in a low percentage (<3%).…”

Ultraporous Polyquaternium-Carboxylated Chitosan Composite Hydrogel Spheres with Anticoagulant, Antibacterial, and Rapid Endotoxin Removal Profiles for Sepsis Treatment

“…In this work, we intend to use dimethyl diallyl ammonium chloride (DDA) and carboxylated chitosan (CCS) to prepare composite hydrogel spheres. DDA is polymerized to form strong cationic polyelectrolytes through radical-initiated cyclopolymerization; therefore the homo- or co-polymerization products (PDDA) are antibacterial and widely used in the removal of anionic toxins. , CCS exhibits a negative charge at physiological pH relying on the abundant carboxyl and carboxymethyl groups and is widely used in biomedical fields, , because of its favorable biocompatibility. To expose more functional sites for the adsorbent, herein, we develop a novel emulsion template (ET) method to endow the hydrogel sphere with an ultraporous structure.…”

Online monitoring of diallyldimethylammonium chloride polymerization

“…Practical importance of DADMAC homopolymer and copolymer studies involving polymerization mechanism and kinetics, molecular characterization, and solution properties of this system have drawn great interest. Highly hygroscopic nature of PDADMAC causes difficulties in characterization polymerization reaction by chemical methods or isolation and gravimetrically . The electrostatic repulsion between the ion and the charged macroradical depend on the pH value of the medium and the concentrations of ionic species.…”