Matrix assisted laser methacrylate

Matrix-Assisted Laser Desorption/lonization Time-of-liight Mass Spectrometry (MALDI-TOF MS, PerSeptive Biosystems Voyager-DE STR) was used to characterize the molecular weight distribution and the number average molecular weight (M ) of the poly(methacrylic acid) (PMAA) degradation products as described elsewhere [25]. [Pg.190]

Jackson, A. T., Yates, H. T., Scrivens, J. H., Green, M. R., and Bateman, R. H., Utilizing matrix-assisted laser desorption/ionization-collision induced dissociation for the generation of structural information from polyjalkyl methacrylate)s,. Am. Soc. Mass Spectrom., 8, 1206, 1997. [Pg.52]

Hoberg, A.-M., Haddleton, D. M., Derrick, P. J., Jackson, A. T., and Scrivens, J. H., The Effect of Counter Ions in Matrix-assisted Laser Desorption/Ionization of Poly(methyl methacrylate), Eur. Mass. Spectrom., 4, 435,1998. [Pg.512]

Lloyd, P. M., Suddaby, K. G., Varney J. E., Scrivener, E., Derrick, P. J., and Eladdleton, D. M., A Gomparison Between Matrix-assisted Laser Desorption/ Ionization Time-of-flight Mass Spectrometry and Size Exclusion Chromatography in the Mass Characterisation of Synthetic Polymers with Narrow Molecular-mass Distributions Poly(mefhyl methacrylate) and Poly(styrene), Eur. Mass Spectrom., 1, 293, 1995. [Pg.516]

Guo, B., Chen, H., and Liu, R. X., Observation of Varying Molecular Weight Distributions in Matrix-assisted Laser Desorption/Ionization lime-of-Flight Analysis of Polymethyl Methacrylate, Rapid Comm. Mass. Spectrom., 11, 781,... [Pg.517]

Danis, R. O., Karr, D. E., Simonsick, W. J. Jr., and Wu, D. T., Matrix-Assisted Laser Desorption/Ionization Time-of-Flight Mass Spectrometry Characterization of Rolyjbutyl methacrylate) Synthesized by Group-Transfer Polymerization, Macromolecules, 28, 1229,1995. [Pg.518]

Zammit, M. D., Davis, T. R, and Haddleton, D. M., Determination of the Propagation Rate Coefficient (kp) and Termination Mode in the Free-Radical Polymerization of Methyl Methacrylate, Employing Matrix-Assisted Laser Desorption Ionization Time-of-Flight Mass Spectrometry for Molecular Weight Distribution Anal5 is, Macromolecules, 29, 492, 1996. [Pg.519]

Pasch, H. and Gores, R, Matrix-assisted Laser Desorption/Ionization Mass Spectrometry of Synthetic Polymers 2. Analysis of Poly(methyl methacrylate). Polymer, 36, 1999, 1995. [Pg.522]

Sakurada, N., Fukuo, T., Arakawa, R., Ute, K., and Hatada, K., Characterization of Poly(methyl methacrylate) by Matrix-assisted Laser Desorption Ionization Mass Spectrometry. A Comparison with Supercritical Fluid Chromatography and Gel Permeation Chromatography, Rapid Comm, Mass Spectrom., 12, 1895, 1998. [Pg.527]

Laine, O., Trimpin, S., Raeder, H.J., and Muellen, K. (2003) Changes in post-source decay fragmentation behavior of poly(methyl methacrylate) polymers with increasing molecular weight studied by matrix-assisted laser desorption/ionization time-of-flight mass spectrometry. Eur. J. Mass Spectrom., 9, 195-201. [Pg.361]

Wyzgoski, F.J., Poke, M., Wesdemiotis, C, Arnonld, M.A. (2007) Matrix-assisted laser desorption/ionization time-of-flight mass spectrometry investigations of polystyrene and poly(methyl methacrylate) produced by monoacyl-phosphine oxide photoinitiation. J. Polym. Sci. A, 45, 2161-2171. [Pg.1104]

Jackson, A.T., Bunn, A., Chisholm, M.S. (2008) UtiUsing matrix-assisted laser desorption/ionization techniques for the generation of structural information from different end-gronp functionalized poly(methyl methacrylate)s. Polymer, 49,5254-5261. [Pg.1105]

The termination mode of poly(alkyl methacrylate) radicals has also been the subject of much research.[9] Model compound studies of the bimolecular reactions of l-methoxycarbonyH-methylethyl radicals and the higher esters ethyl and butyl have resulted in for MMA, 0.72 for EMA, and 1.17 for nBMA.[9,10]. A k /k =4.37 was obtained by means of Matrix-assisted laser desorption/ionisation-time of flight mass spectrometry (MALDI-TOF MS) to the end-group analysis of low MW PMMA.[11] The use of fluorinated derivatives of BPO in combination with F NMR analysis of PMMA also indicated that the termination occurred mainly due to the disproportionation in this system.[12]... [Pg.443]

Bamer-Kowollik C, Vana P, Davis TP. 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. J Polym Sci A Polym Chem 2002 40 675-681. [Pg.223]

Jackson et al" compared the most probable peak values as measured for polymer distributions by matrix assisted laser desorption/ionization (MALDI) mass spectrometry and by size exclusion chromatography (SEC). MALDI provided the most probable peak (Mp) values for polymethyl methacrylate polymers that are low reletive to Mp values supplied by the polymer manufacturers which were obtained by SEC. The reasons for this discrepancy are discussed. [Pg.30]

The use of MALDI (Matrix-Assisted Laser Desorption Ionization) equipped with a time of flight (TOP) spectrometer offers an elegant and effective method for the precise and absolute determination of polymer molar masses. Initially designed for the characterization of biomolecules, MALDI-TOF spectrometry is now extensively applied to synthetic polymers in this technique the polymer to be studied is dispersed in an organic matrix that is volatilized under the effect of a laser radiation whose wavelength is in the absorption range of the matrix. Owing to the specific molecular interactions between polymer and matrix—which plays an important role in the chain desorption—each polymer requires a suitable matrix. For example, 1,8,9-trihydroxyanthracene is well suited to poly(methyl methacrylate). [Pg.183]

While catalytic chain transfer is very efficient for tertiary radicals, as for example in methyl methacrylate polymerization, its efficiency is much lower for secondary radicals. This is explained by cobalt-carbon bonding as a side reaction, which significantly reduces the concentration of the catalytically active species. Adducts containing cobalt-carbon bonds have been detected via matrix-assisted laser desorption ionization (MALDI) mass spectrometry. ... [Pg.34]