ISSN:
0887-624X
Keywords:
polymerization
;
divinyl monomer
;
redox
;
thiocarboxylic acid
;
mechanism
;
Chemistry
;
Polymer and Materials Science
Source:
Wiley InterScience Backfile Collection 1832-2000
Topics:
Chemistry and Pharmacology
Notes:
The kinetics of aqueous polymerization of the symmetrical nonconjugated divinyl monomer N,N′-methylenebis(acrylamide) (MBA), was studied at 35°C and at constant ionic strength under nitrogen atmosphere involving potassium peroxydiphosphate (PDP) as oxidant with three different activators thiolactic acid (TLA), thiomalic acid (TMA), and thioglycollic acid (TGA). The rate of polymerization, RP, and rate of disappearance of peroxydiphosphate, -RPDP have been followed while polymerization was initiated separately by the PDP-TLA/PDP-TMA/PDP-TGA redox systems. RP for the above three systems showed first-order dependences on both [monomer] and [activator] and zero-order dependence on [PDP]. First-order dependence on [PDP] and zero-order dependences on [monomer] and [activators] were observed with respect to -RPDP in the above three systems. A reaction mechanism which involves complex formation between PDP and thiocarboxylic acid, propagation through intramolecular-intermolecular reactions, degradative chain transfer reaction of the growing radical with PDP, and linear termination by the interaction of the chain radical with primary radical was proposed. The kinetic parameters for the three polymerization systems were calculated and compared. © 1998 John Wiley & Sons, Inc. J Polym Sci A: Polym Chem 36: 11-20, 1998
Additional Material:
4 Ill.
Type of Medium:
Electronic Resource
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