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Chain transfer in pulsed laser polymerization of methylmethacrylate in the presence of different cobalt (II) [Co(dmg-2H)2 (BF2)2] and [Co(afdo-2H)2 (BF2)2] complexes

Paper ID Volume ID Publish Year Pages File Format Full-Text
28577 44081 2006 8 PDF Available
Title
Chain transfer in pulsed laser polymerization of methylmethacrylate in the presence of different cobalt (II) [Co(dmg-2H)2 (BF2)2] and [Co(afdo-2H)2 (BF2)2] complexes
Abstract

Methylmethacrylate (MMA) was polymerized at 25 °C with excimer laser (λ = 308 nm) in the presence of different Co(II) chain transfer agents, bis(boron difluorodimethylglyoximate) cobaltate(II) [Co(dmg-2H)2 (BF2)2] (henceforth called catalyst (1)) and bis(boron difluorodialphafurilglyoximate) cobaltate(II) [Co(afdo-2H)2 (BF2)2] (henceforth called catalyst (2)) used separately, with 2,2′-Azobis-(2-methylpropionitrile) [AIBN] as an initiator. The polymer (PMMA) formed in this study was characterized using GPC, 1H NMR, 13C NMR, and DEPT 135. The value of chain transfer constant (Cs) was higher for catalyst (1) than catalyst (2) by a factor of 5. The higher character of “living free radical polymerization”, as evident from the low values of polydispersity index (PDI), was observed mainly for catalyst (2). Both steric and electronic factors supported by IR and UV–vis spectra for the two catalysts indicate that catalyst (2) is a weaker nucleophile as compared to catalyst (1) forming a weaker Co–C bond between this catalyst and growing polymer chain indicating more living polymerization for the catalyst (2).

Keywords
Pulsed laser polymerization; Cobalt (II) catalysts; Chain transfer constant; Methylmethacrylate
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Chain transfer in pulsed laser polymerization of methylmethacrylate in the presence of different cobalt (II) [Co(dmg-2H)2 (BF2)2] and [Co(afdo-2H)2 (BF2)2] complexes
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Publisher
Database: Elsevier - ScienceDirect
Journal: Journal of Photochemistry and Photobiology A: Chemistry - Volume 184, Issues 1–2, 15 November 2006, Pages 58–65
Authors
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Subjects
Physical Sciences and Engineering Chemical Engineering Bioengineering
Get Full-Text Now
Don't Miss Today's Special Offer
Price was $35.95
You save - $31
Price after discount Only $4.95
100% Money Back Guarantee
Full-text PDF Download
Online Support
Any Questions? feel free to contact us