Threshold Particle Diameters in Miniemulsion Reversible-Deactivation Radical Polymerization

Polymers

关键词: controlled/living radical polymerization;    emulsion polymerization;    stable-radical-mediated polymerization (SRMP);    atom-transfer radical polymerization (ATRP);    reversible-addition-fragmentation chain-transfer polymerization (RAFT);    polymerization kinetics;   

DOI  :  10.3390/polym3041944

来源: mdpi

【 摘 要 】

Various types of controlled/living radical polymerizations, or using the IUPAC recommended term, reversible-deactivation radical polymerization (RDRP), conducted inside nano-sized reaction loci are considered in a unified manner, based on the polymerization rate expression, R_p = k_p[M]K[Interm]/[Trap]. Unique miniemulsion polymerization kinetics of RDRP are elucidated on the basis of the following two factors: (1) A high single molecule concentration in a nano-sized particle; and (2) a significant statistical concentration variation among particles. The characteristic particle diameters below which the polymerization rate start to deviate significantly (1) from the corresponding bulk polymerization, and (2) from the estimate using the average concentrations, can be estimated by using simple equations. For stable-radical-mediated polymerization (SRMP) and atom-transfer radical polymerization (ATRP), an acceleration window is predicted for the particle diameter range,the polymerization rate is suppressed because of a large statistical variation of monomer concentration among particles.

【 授权许可】

CC BY   
© 2011 by the authors; licensee MDPI, Basel, Switzerland.