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The PLP‐SEC Method: Perspectives and Limitations
Author(s) -
Drawe Patrick,
Buback Michael
Publication year - 2016
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/mats.201500048
Subject(s) - monomer , photoinitiator , polymerization , radical , chemistry , radical polymerization , laser , ionization , polymer , polymer chemistry , analytical chemistry (journal) , chromatography , organic chemistry , ion , optics , physics
Pulsed‐laser polymerization (PLP) in conjunction with polymer analysis by size‐exclusion chromatography (SEC) is the IUPAC‐recommended method for measuring propagation rate coefficients, k p , of radical polymerization. Pulse repetition rate, v rep , and photoinitiator concentration need to be adjusted to the termination rate of the monomer, preferably via the quantity β , the fraction of radicals terminating prior to applying the successive laser pulse. By PREDICI simulation, the prerequisites for successful PLP‐SEC work are demonstrated. Slow termination, as with fully ionized monomers, is specifically addressed. Both very high and very low v rep are not suitable for accurate k p measurements.