LAPSE:2018.0213
Published Article
LAPSE:2018.0213
Poly(methacrylic acid-ran-2-vinylpyridine) Statistical Copolymer and Derived Dual pH-Temperature Responsive Block Copolymers by Nitroxide-Mediated Polymerization
Milan Marić, Chi Zhang, Daniel Gromadzki
July 31, 2018
Nitroxide-mediated polymerization using the succinimidyl ester functional unimolecular alkoxyamine initiator (NHS-BlocBuilder) was used to first copolymerize tert-butyl methacrylate/2-vinylpyridine (tBMA/2VP) with low dispersity (Đ = 1.30⁻1.41) and controlled growth (linear number average molecular Mn versus conversion, Mn = 3.8⁻10.4 kg·mol−1) across a wide composition of ranges (initial mol fraction 2VP, f2VP,0 = 0.10⁻0.90). The resulting statistical copolymers were first de-protected to give statistical polyampholytic copolymers comprised of methacrylic acid/2VP (MAA/2VP) units. These copolymers exhibited tunable water-solubility due to the different pKas of the acidic MAA and basic 2VP units; being soluble at very low pH < 3 and high pH > 8. One of the tBMA/2VP copolymers was used as a macroinitiator for a 4-acryloylmorpholine/4-acryloylpiperidine (4AM/4AP) mixture, to provide a second block with thermo-responsive behavior with tunable cloud point temperature (CPT), depending on the ratio of 4AM:4AP. Dynamic light scattering of the block copolymer at various pHs (3, 7 and 10) as a function of temperature indicated a rapid increase in particle size >2000 nm at 22⁻27 °C, corresponding to the 4AM/4AP segment’s thermos-responsiveness followed by a leveling in particle size to about 500 nm at higher temperatures.
Keywords
nitroxide-mediated polymerization, poly(ampholytes), stimuli-responsive polymers
Subject
Suggested Citation
Marić M, Zhang C, Gromadzki D. Poly(methacrylic acid-ran-2-vinylpyridine) Statistical Copolymer and Derived Dual pH-Temperature Responsive Block Copolymers by Nitroxide-Mediated Polymerization. (2018). LAPSE:2018.0213
Author Affiliations
Marić M: Department of Chemical Engineering, McGill University, Montreal, QC H3A 0C5, Canada [ORCID]
Zhang C: Department of Chemical Engineering, McGill University, Montreal, QC H3A 0C5, Canada; AstenJohnson Inc., 50 Richardson Side Rd, Kanata, ON K2K 1X2, Canada
Gromadzki D: Department of Chemical Engineering, McGill University, Montreal, QC H3A 0C5, Canada
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Journal Name
Processes
Volume
5
Issue
1
Article Number
E7
Year
2017
Publication Date
2017-02-21
Published Version
ISSN
2227-9717
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PII: pr5010007, Publication Type: Journal Article
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LAPSE:2018.0213
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doi:10.3390/pr5010007
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Jul 31, 2018
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