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Laser Single Pulse Initiated RAFT Polymerization for Assessing Chain-Length Dependent Radical Termination Kinetics

✍ Scribed by Michael Buback; Thomas Junkers; Philipp Vana

Publisher
John Wiley and Sons
Year
2005
Tongue
English
Weight
189 KB
Volume
26
Category
Article
ISSN
1022-1336

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✦ Synopsis

Abstract

Summary: A novel method combining RAFT polymerization with pulsed‐laser initiation for determining chain‐length dependent termination rate coefficients, k~t~, is presented. Degenerative chain‐transfer in RAFT enables single‐pulse pulsed‐laser polymerization (SP‐PLP) traces to be measured on systems with a narrow radical distribution that remains essentially unchanged during the experiment. SP‐PLP‐RAFT experiments at different polymerization times allow for determining k~t~ as a function of chain length via classical kinetics assuming chain‐length independent k~t~.

Single‐pulse pulsed‐laser polymerization trace for BMPT‐mediated RAFT polymerization of butyl acrylate.

magnified imageSingle‐pulse pulsed‐laser polymerization trace for BMPT‐mediated RAFT polymerization of butyl acrylate.

📜 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
✍ Anatolij N. Nikitin; Alexander V. Evseev 📂 Article 📅 1999 🏛 John Wiley and Sons 🌐 English ⚖ 216 KB 👁 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