Journal
JOURNAL OF POLYMER SCIENCE
Volume 58, Issue 16, Pages 2211-2220Publisher
WILEY
DOI: 10.1002/pol.20200337
Keywords
grafting to; nitroxide-mediated polymerization; pH-responsive polymers; starch nanoparticles; zeta potential
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Funding
- EcoSynthetix Inc.
- Natural Sciences and Engineering Research Council of Canada
- Ontario Research Chairs Program
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The grafting to approach and nitroxide-mediated polymerization (NMP) were used to graft modify starch nanoparticles (SNP) with pH-responsive polymers. SG1-capped poly(2-(dimethylamino)ethyl methacrylate-co-styrene), P(DMAEMA-co-S), and poly(2-(diethylamino)ethyl methacrylate-co-styrene), P(DEAEMA-co-S), with relatively low dispersity and high degree of livingness was synthesized in bulk via NMP using a commercial available alkoxyamine. These macroalkoxyamines were then grafted to vinyl benzyl-functionalized SNP (SNP-VBC) to obtain pH-responsive materials. The grafted SNP were characterized by proton nuclear magnetic resonance spectroscopy, Fourier transform infrared spectroscopy, thermogravimetric analysis, and elemental analysis confirming the successful synthesis of these new materials. Low grafting efficiencies (similar to 6%) were observed for both SNP-grafted materials with pH-responsive polymers, as expected when using the grafting to approach. The pH-responsiveness of SNP-g-P(DMAEMA-co-S) and SNP-g-P(DEAEMA-co-S) was confirmed by measuring the zeta-potential at different pH values. At acidic conditions (pH 3-6) the grafted materials were protonated and exhibited positive zeta-potential, whereas at basic conditions (pH 10-13) the same grafted materials were deprotonated and exhibited negative zeta-potential.
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