Functional cellulose nanocrystals containing cationic and thermo-responsive polymer brushes
| Autor: | Salha N. Al-Harthi, Nathan Grishkewich, Kam Chiu Tam, Richard Berry |
|---|---|
| Rok vydání: | 2020 |
| Předmět: |
chemistry.chemical_classification
Polymers and Plastics Organic Chemistry Radical polymerization Cationic polymerization 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology Methacrylate 01 natural sciences Lower critical solution temperature Polyelectrolyte 0104 chemical sciences chemistry.chemical_compound chemistry Chemical engineering Materials Chemistry Salting out 0210 nano-technology Ethylene glycol |
| Zdroj: | Carbohydrate polymers. 246 |
| ISSN: | 1879-1344 |
| Popis: | Cationic and thermo-responsive polymer brushes were grafted from the surface of cellulose nanocrystals. Di(ethylene glycol) methyl ether methacrylate (MEO2MA) and poly(oligoethylene glycol) methyl ether acrylate (OEGMA300) and (2-methacryloyloxyethyl) trimethylammonium chloride (DMC) were grafted from cellulose nanocrystals (CNCs) via free radical polymerization. The CNC-g-POEGMA (CP) possessed a tunable lower critical solution temperature (LCST) of about 50 °C, and cloud point measurements confirmed that the LCST of the nanoparticles could be manipulated within the range of 40-47 °C by adjusting the DMC content. The salt effect was also investigated, and the results revealed a typical salting-out effect for the CNC-g-POEGMA after the introduction of KCl. On the other hand, the CNC-g-POEGMA-g-DMC (CPD) copolymers displayed two salt-responsive characteristics; polyelectrolyte effect at lower salt concentrations, followed by the salting-out effect at higher salt concentrations, which is dependent on the DMC content. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full Text from ScienceDirect