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Effect of photoinitiator on the molar mass distribution obtained from a pulsed laser polymerization

✍ Scribed by Ute Bergert; Sabine Beuermann; Michael Buback; Caroline H. Kurz; Gregory T. Russell; Claudia Schmaltz

Publisher
John Wiley and Sons
Year
1995
Tongue
English
Weight
546 KB
Volume
16
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

The choice of the photoinitiator is not usually regarded as being as important consideration in attempting to determine the value of the propagation rate coefficient k~p~ from a pulsed laser‐initiated polymerization (PLP). It is shown that in fact the choice of the photoinitiator can profoundly influence the success of such experiments. Specially, for a number of monomers it was found that the successful determination of k~p~ is essentially impossible when 1,1‐azodicyclohexanecarbonitrile is employed as a photoinitiator. The likely reason for this phenomenon is discussed from which it would seem appropriate to be wary in using any azo compound as a PLP photoinitiator. From PLP experiments with a non‐azo photoinitiator, ambient pressure k~p~ has been determined for bulk polymerization of methyl methacrylate over an extended temperature range.

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