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New aspects of chain‐length dependent termination
Author(s) -
Olaj Oskar Friedrich,
Kornherr Andreas,
Vana Philipp,
Zoder Monika,
Zifferer Gerhard
Publication year - 2002
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/1521-3900(200206)182:1<15::aid-masy15>3.0.co;2-o
Subject(s) - polymerization , materials science , chain (unit) , pulse (music) , analytical chemistry (journal) , molar mass distribution , laser , distribution (mathematics) , chemistry , polymer , polymer chemistry , molecular physics , optics , physics , mathematics , chromatography , composite material , mathematical analysis , astronomy , detector
A survey is given on a selection of recently developed methods for the evaluation of the rate coefficient k t of termination and its chain‐length dependence. In particular these are the time‐resolved single‐pulse pulsed laser polymerization (TR‐SP‐PLP), the single pulse pulsed laser polymerization in combination with the analysis of the molecular weight distribution produced (SP‐PLP‐MWD), the methods yielding an average k t either from the second moment of the chain‐length distribution (CLD) or from the rate of polymerization, and a method focusing on the chain‐length dependence of k t consisting in an analysis of the CLD resulting from PLP experiments carried out at low pulse frequencies (LF‐PLP). The results obtained by these methods are compared and discussed. The role of the shielding of the two radical chains by their appendant coils is emphasized.