UNSPECIFIED (1996) MALDI-TOF mass spectrometry in the study of statistical copolymerizations and its application in examining the free radical copolymerization of methyl methacrylate and n-butyl methacrylate. MACROMOLECULES, 29 (27). pp. 8642-8649. ISSN 0024-9297

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Abstract

Matrix-assisted laser desorption/ionization time-of-flight (MALDI-TOF) mass spectrometry nas used to obtain bivariate distributions of composition and chain length for a series of copolymers of methyl methacrylate (MMA) and n-butyl methacrylate (BMA) produced by free radical catalytic chain transfer polymerization. The relationship between the bivariate distributions of copolymers and the kinetics of the copolymerization reactions from which they were formed was derived using the terminal copolymerization model. This relationship was used with the mass spectra from the MMA/BMA copolymerizations studied to estimate kinetic parameters which describe the polymerizations. For this copolymerization the reactivity ratios, (catalytic) chain transfer coefficients, and initiator selectivity were determined to be r(MMA) = 1.09, r(BMA) = 0.77, C-S,C-MMA = 17 900, C-S,C-BMA = 6150, and S-MMA = 0.535, respectively The reactivity ratios for these polymerizations were also determined from H-1 NMR to be r(MMA) = 0.75 and r(BMA) = 0.98, using an error-in-variables model (EVM) treatment. The parameters determined from the mass spectra were compared with both the NMR values and literature values, where available, and general agreement is shown.

Item Type:	Journal Article
Subjects:	Q Science > QD Chemistry
Journal or Publication Title:	MACROMOLECULES
Publisher:	AMER CHEMICAL SOC
ISSN:	0024-9297
Date:	30 December 1996
Volume:	29
Number:	27
Number of Pages:	8
Page Range:	pp. 8642-8649
Publication Status:	Published
URI:	http://wrap.warwick.ac.uk/id/eprint/18090

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