Journal
POLYMER CHEMISTRY
Volume 8, Issue 38, Pages 6000-6012Publisher
ROYAL SOC CHEMISTRY
DOI: 10.1039/c7py01258f
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Funding
- Natural Sciences and Engineering Research Council of Canada
- Ontario Research Chairs Program (MF Cunningham)
- Ernest-Solvay-Foundation
- Studienstiftung des deutschen Volkes (German Academic Scholarship Foundation)
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A grafting to approach on a cellulose derivative using reversible deactivation radical polymerisation (RDRP) is reported for the first time. SG1-capped poly(N, N-(diethylamino) ethyl methacrylate) (PDEAEMA) and poly(N-3-(dimethylamino) propyl methacrylamide) (PDMAPMAm) macroalkoxyamines of different molecular weights, showing low dispersity, high livingness and end group fidelity were grown in bulk through Nitroxide-Mediated Polymerisation (NMP) using the alkoxyamine N-hydroxysuccinimidyl BlocBuilder (R) (NHS-BlocBuilder). In the second step, these CO2-responsive macroalkoxyamines were grafted to glycidyl methacrylate (GMA) modified cellulose nanocrystals (CNC) to obtain CO2-responsive CNC. Two different tertiary amine polymers were selected to investigate how differences in their pKaH and Tg affected the final properties of the graft-modified CNC. The effect of the macroalkoxyamines molecular weight on the graft density was investigated in detail and was shown to have a direct influence on the dispersion behaviour and CO2-responsiveness of the grafted CNC particles, as demonstrated by zeta potential measurements in water and phase shuttling experiments between oil and water. The results suggested that a particular pKaH, minimum graft density and graft length are required to effectively switch the CNC from a hydrophilic to a fully hydrophobic state.
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