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Open AccessFeature PaperArticle

The Effect of Hydrogen Bonding on Radical Semi-Batch Copolymerization of Butyl Acrylate and 2-Hydroxyethyl Acrylate

Department of Chemical Engineering, Queen’s University, 19 Division St, Kingston, ON K7L 3N6, Canada
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Polymers 2017, 9(8), 368; https://doi.org/10.3390/polym9080368
Received: 24 July 2017 / Revised: 12 August 2017 / Accepted: 15 August 2017 / Published: 17 August 2017
(This article belongs to the Special Issue Tailored Polymer Synthesis by Advanced Polymerization Techniques)
The radical copolymerization of butyl acrylate (BA) and 2-hydroxyethyl acrylate (HEA) was investigated under batch and semi-batch operations, with a focus on the influence of hydrogen-bonding on acrylate backbiting. The effect of hydrogen bonding on HEA to BA relative incorporation rates during copolymerization, previously seen in low-conversion kinetic studies, was also observed under high-conversion semi-batch conditions. However, overall reaction rates (as indicated by free monomer concentrations), polymer molar masses, and branching levels did not vary as copolymer HEA content was increased from 0 to 40 wt % in the semi-batch system. In contrast, introduction of a H-bonding solvent, n-pentanol, led to an observable decrease in branching levels, and branching levels were also reduced in batch (co)polymerizations with HEA. These differences can be attributed to the low levels of unreacted HEA in the starved-feed semi-batch system. View Full-Text
Keywords: radical copolymerization; hydrogen bonding; functional comonomer; branching; hydroxyethyl acrylate radical copolymerization; hydrogen bonding; functional comonomer; branching; hydroxyethyl acrylate
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Schier, J.E.S.; Cohen-Sacal, D.; Larsen, O.R.; Hutchinson, R.A. The Effect of Hydrogen Bonding on Radical Semi-Batch Copolymerization of Butyl Acrylate and 2-Hydroxyethyl Acrylate. Polymers 2017, 9, 368.

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