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Instationary polymerization technique – an alternative route for the direct determination of the rate constant of chain propagation
Author(s) -
SchnöllBitai Irene
Publication year - 1999
Publication title -
macromolecular rapid communications
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.348
H-Index - 154
eISSN - 1521-3927
pISSN - 1022-1336
DOI - 10.1002/(sici)1521-3927(19990301)20:3<162::aid-marc162>3.0.co;2-6
Subject(s) - polymerization , disproportionation , molar mass distribution , radical polymerization , polymer chemistry , chemistry , chain transfer , materials science , photochemistry , polymer , organic chemistry , catalysis
Instationary polymerization technique (IPT) is a combination of nonstationary polymerization conditions and the controlled deactivation of all active radicals present in the system by reaction with an inhibitor at a certain time span after initiation. The special features of the resulting molecular weight distribution can be used for the direct determination of k p in analogy to the pulsed‐laser polymerization (PLP) method. Furthermore, a qualitative information about the prevailing termination mechanism – i.e. disproportionation or combination – is also feasible from the distribution at a first glance.