Radical polymerization of N-vinylcaprolactam in benzene solutions in a wide conversion range

Autor:	M. B. Lachinov, Yu. A. Talyzenkov, D. I. Kalugin
Rok vydání:	2008
Předmět:	Kinetic chain length Chain propagation Polymers and Plastics Bulk polymerization Radical polymerization Chain termination chemistry.chemical_compound Monomer chemistry Polymerization Polymer chemistry Materials Chemistry Ceramics and Composites Physical chemistry Living polymerization
Zdroj:	Polymer Science Series B. 50:299-304
ISSN:	1555-6123 1560-0904
Popis:	The kinetics of radical polymerization of N-vinylcaprolactam initiated by the thermal decomposition of AIBN at 60°C in monomer solutions in benzene has been studied in a wide range of conversions. The heat of polymerization of N-vinylcaprolactam is 76.0 ± 0.9 kJ/mol; at initial conversions, the polymerization of N-vinylcaprolactam is of the first order with respect to the monomer and of the 0.5th order with respect to the initiator. The ratio of chain propagation and chain termination rate constants kp/kter0.5 is 0.578 l0.5/(mol s)0.5, thus suggesting a high propagation rate constant kp > 103 l/(mol s). At a high initial concentration of the monomer, the kinetic curves demonstrate a weakly pronounced gel effect, and, in the gel permeation chromatography curves of the polymers, the second high-molecular-mass mode emerges, whose intensity grows with conversion. The observed kinetic features are interpreted in terms of the diffusion control of the gel effect.
Databáze:	OpenAIRE
Externí odkaz:	https://explore.openaire.eu/search/publication?articleId=doi_________::3d00757bef6fffc4e4856c99efaf8692 https://doi.org/10.1134/s1560090408110018 Zobrazit plný text záznamu Full text from SpringerLink