Chain-length dependent termination in pulsed-laser polymerization, 2. On the prospects of determining the bimolecular termination constant kt from the second moment of the chain-length distribution

✍ Scribed by Oskar Friedrich Olaj; Andreas Kornherr; Gerhard Zifferer

• Publisher: John Wiley and Sons
• Year: 1997
• Tongue: English
• Weight: 528 KB
• Volume: 18
• Category: Article
• ISSN: 1022-1336
• DOI: 10.1002/marc.1997.030181202

✦ Synopsis

Abstract

The correct (event weighted) average of k~t~, 〈k~t~〉, has been calculated for pseudostationary laser‐induced polymerization for a kinetic scheme with chain‐length dependent termination and compared to the average k̄~t~ obtained by formally solving for k~t~ the expression for the second moment of the chain‐length distribution valid for chain‐length independent termination (represented by the product of rate of polymerization ν~p~ and weight average degree of polymerization P̄~w~). It is shown that there is a fair agreement between the two quantities. This may be used to recover experimentally the power‐law governing the dependence of k~t~ on chain‐length, especially its exponent.