๐”– Bobbio Scriptorium
โœฆ   LIBER   โœฆ

Chain-length dependent termination in pulsed-laser polymerization, 1. Interaction with propagation

โœ Scribed by Oskar Friedrich Olaj; Andreas Kornherr; Gerhard Zifferer

Book ID
102943250
Publisher
John Wiley and Sons
Year
1997
Tongue
English
Weight
573 KB
Volume
6
Category
Article
ISSN
1022-1344

No coin nor oath required. For personal study only.

โœฆ Synopsis

Abstract

Using a new simulation procedure in which each individual propagation step is subjected to a Poisson process it was proved that in case of chainโ€length dependent termination the apparent rate of propagation no longer coincides with the true one. This is caused by the polydispersity of the chainโ€length distribution of the growing chains: shorter chains are removed preferentially. This effect is comparatively small although significant. The consequences for the determination of the rate constant of chain propagation k~p~ are nearly negligible.

๐Ÿ“œ SIMILAR VOLUMES

Kinetics of free-radical polymerization
Kinetics of free-radical polymerization with chain-length-dependent constants under initiation by laser pulses: Effect of chain length dependence of propagation
โœ Anatolij N. Nikitin; Alexander V. Evseev ๐Ÿ“‚ Article ๐Ÿ“… 1999 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 216 KB ๐Ÿ‘ 2 views

A numerical procedure is developed which allows taking into account the chain length dependence of the termination and propagation constants for calculating molecular weight distributions (MWDs) formed under free-radical polymerization initiated by an arbitrary sequence of laser pulses. The law whe

Laser Single Pulse Initiated RAFT Polyme
Laser Single Pulse Initiated RAFT Polymerization for Assessing Chain-Length Dependent Radical Termination Kinetics
โœ Michael Buback; Thomas Junkers; Philipp Vana ๐Ÿ“‚ Article ๐Ÿ“… 2005 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 189 KB

## Abstract **Summary:** A novel method combining RAFT polymerization with pulsedโ€laser initiation for determining chainโ€length dependent termination rate coefficients, __k__~t~, is presented. Degenerative chainโ€transfer in RAFT enables singleโ€pulse pulsedโ€laser polymerization (SPโ€PLP) traces to be

Chain length-dependent termination in pu
Chain length-dependent termination in pulsed-laser polymerization. VIII. The temperature dependence of the rate coefficient of bimolecular termination in the bulk polymerization of styrene
โœ Oskar Friedrich Olaj; Philipp Vana ๐Ÿ“‚ Article ๐Ÿ“… 2000 ๐Ÿ› John Wiley and Sons ๐ŸŒ English โš– 157 KB ๐Ÿ‘ 3 views

The photosensitized polymerization of styrene in bulk was investigated in the temperature range of 25-70ยฐC with respect to the average rate coefficient of bimolecular chain termination k t , especially its chain length dependence at low conversions, by means of pulsed laser polymerization (PLP). Thr