Laser-induced decomposition of 2,2-dimethoxy-2-phenylacetophenone and benzoin in methyl methacrylate homopolymerization studied via matrix-assisted laser desorption/ionization time-of-flight mass spectrometry
Barner-Kowollik, C., Vana, P., & Davis, T. P. (2002) Laser-induced decomposition of 2,2-dimethoxy-2-phenylacetophenone and benzoin in methyl methacrylate homopolymerization studied via matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Journal of Polymer Science, Part A: Polymer Chemistry, 40(5).
Pulsed laser polymerization (PLP) experiments were performed on the bulk polymerization of methyl methacrylate (MMA) at -34 °C. The aim of this study was to investigate the polymer end groups formed during the photoinitiation process of MMA monomer using 2,2-dimethoxy-2-phenylacetophenone (DMPA) and benzoin as initiators via matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry. Analysis of the MALDI-TOF spectra indicated that the two radical fragments generated upon pulsed laser irradiation show markedly different reactivity toward MMA: whereas the benzoyl fragment-common to both DMPA and benzoin-clearly participates in the initiation process, the acetal and benzyl alcohol fragments cannot be identified as end groups in the polymer. The complexity of the MALDI-TOF spectrum strongly increased with increasing laser intensity, this effect being more pronounced in the case of benzoin. This indicates that a cleaner initiation process is at work when DMPA is used as the photoinitiator. In addition, the MALDI-TOF spectra were analyzed to extract the propagation-rate coefficient, kp, of MMA at -34 °C. The obtained value of kp = 43.8 L mol-1 s-1 agrees well with corresponding numbers obtained via size exclusion chromatography (kp = 40.5 L mol-1 s-1). © 2002 John Wiley & Sons, Inc. J. Polym. Sci. Part A: Polym. Chem.
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|Item Type:||Journal Article|
|Additional Information:||Cited By :24
Export Date: 5 September 2016
Correspondence Address: Barner-Kowollik, C.; Ctr. for Adv. Macromolecular Design, Sch. of Chem. Eng. and Indust. Chem., University of New South Wales, Sydney, NSW 2052, Australia; email: email@example.com
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|Keywords:||Initiators, Laser-induced polymers, MALDI, Methyl methacrylate, Propagation-rate coefficient, Desorption, Irradiation, Laser applications, Mass spectrometry, Photoionization, Polymerization, Size exclusion chromatography, Pulsed laser polymerization (PLP), Polymethyl methacrylates, chromatography, laser, polymethyl methacrylate|
|Divisions:||Current > Schools > School of Chemistry, Physics & Mechanical Engineering
Current > Institutes > Institute for Future Environments
Current > QUT Faculties and Divisions > Science & Engineering Faculty
|Deposited On:||22 Sep 2016 04:50|
|Last Modified:||22 Sep 2016 04:50|
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