Catalytic oxidation of cellulose with a novel amphiphilic nitroxide block copolymer as a recoverable catalyst
| Autor: | Shaojie Liu, Erjun Tang, Xing Yubin, Jiangze Han |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Nitroxide mediated radical polymerization
Materials science Polymers and Plastics Atom-transfer radical-polymerization Oxidized cellulose 02 engineering and technology 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences 0104 chemical sciences chemistry.chemical_compound Monomer chemistry Catalytic oxidation Polymer chemistry Copolymer Cellulose 0210 nano-technology Ethylene glycol |
| Zdroj: | Cellulose. 24:3635-3644 |
| ISSN: | 1572-882X 0969-0239 |
| DOI: | 10.1007/s10570-017-1375-x |
| Popis: | A novel amphiphilic block copolymer of poly(ethylene glycol)-b-poly(2,2,6,6-tetramethylpiperidinyloxy-4-yl-methacrylate) was prepared through activators regenerated by electron transfer atom transfer radical polymerization of 2,2,6,6-tetramethylpiperidine methacrylate monomer, followed by oxidizing it with 3-chloroperoxybenzoic acid. This nitroxide block copolymer was used as a recoverable catalyst instead of free 2,2,6,6-tetramethylpiperidine-1-oxyl for selective catalytic oxidation of cellulose. According to its amphiphilic property, a mixture of acetonitrile and water was used as the reaction medium. The resulting carboxyl content of oxidized cellulose reached 1.07 mmol/g, equivalent to 73.2% of free TEMPO, was satisfactory. Furthermore, the block copolymer was easy to recycle and the activity did not decrease to a noticeable level after 4 cycles. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|
Full text from SpringerLink