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Processes 2017, 5(2), 19; doi:10.3390/pr5020019

Kinetics of the Aqueous-Phase Copolymerization of MAA and PEGMA Macromonomer: Influence of Monomer Concentration and Side Chain Length of PEGMA

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POLYMAT and Kimika Aplikatua Saila, Kimika Zientzien Fakultatea, University of the Basque Country UPV/EHU, Joxe Mari Korta Zentroa, Tolosa Hiribidea 72, 20018 Donostia-San Sebastián, Spain
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Sustainable Construction Division, Tecnalia Research & Innovation, Parque Tecnológico de Bizkaia, c/Geldo, Edificio 700, 48160 Derio, Spain
*
Author to whom correspondence should be addressed.
Academic Editor: Alexander Penlidis
Received: 15 March 2017 / Revised: 14 April 2017 / Accepted: 14 April 2017 / Published: 20 April 2017
(This article belongs to the Special Issue Water Soluble Polymers)
View Full-Text   |   Download PDF [2768 KB, uploaded 20 April 2017]   |  

Abstract

An in situ nuclear magnetic resonance spectroscopy (NMR) technique is used to monitor the aqueous-phase copolymerization kinetics of methacrylic acid (MAA) and poly(ethylene glycol) methyl ether methacrylate (PEGMA) macromonomers. In particular, the study analyses the effect of the number of ethylene glycol (EG) groups along the lateral chains of PEGMA and is carried out under fully ionized conditions of MAA at different initial monomer ratios and initial overall monomer concentrations (5–20 wt % in aqueous solution). The composition drift with conversion indicates that PEGMA macromonomer is more reactive than MAA. Individual monomer consumption rates show that the rates of consumption of both monomers are not first order with respect to overall concentration of the monomer. The reactivity ratios estimated from the copolymerization kinetics reveal, that for the short PEGMA, the reactivity ratios rMAA and rPEGMA increase with the solids content (SC). A totally different trend is obtained for the longer PEGMA, whose reactivity ratio (rPEGMA23) decreases with solids content, whereas the reactivity ratio of MAA remains roughly constant. View Full-Text
Keywords: aqueous-phase copolymerization; polyethylene glycol methacrylate monomers; reactivity ratios; ionization degree; solids content aqueous-phase copolymerization; polyethylene glycol methacrylate monomers; reactivity ratios; ionization degree; solids content
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MDPI and ACS Style

Emaldi, I.; Hamzehlou, S.; Sanchez-Dolado, J.; Leiza, J.R. Kinetics of the Aqueous-Phase Copolymerization of MAA and PEGMA Macromonomer: Influence of Monomer Concentration and Side Chain Length of PEGMA. Processes 2017, 5, 19.

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