Temperature-induced thickening of sodium carboxymethylcellulose and poly(N-isopropylacrylamide) physical blends in aqueous solution
| Autor: | Nívia do Nascimento Marques, Rosangela Regia Lima Vidal, Bruna V. Lima, Ana M. S. Maia, Rosangela de Carvalho Balaban |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Sodium carboxymethylcellulose Aqueous solution Materials science Polymers and Plastics Radical polymerization General Chemistry Polymer Condensed Matter Physics Temperature induced Viscosity chemistry.chemical_compound chemistry Rheology Chemical engineering Polymer chemistry Materials Chemistry Poly(N-isopropylacrylamide) |
| Zdroj: | Polymer Bulletin. 69:1093-1101 |
| ISSN: | 1436-2449 0170-0839 |
| DOI: | 10.1007/s00289-012-0813-z |
| Popis: | This study describes the synthesis of poly(N-isopropylacrylamide) (PNIPAM) via free radical polymerization, the preparation of physical blends containing sodium carboxymethylcellulose (CMC) and PNIPAM in aqueous solution, at total polymer concentrations of 2 and 6 g/L in different compositions, and applies rheology to investigate interactions between PNIPAM and CMC compared to pure polymers, in aqueous solution. Rheological measurements indicated thermothickening behavior for the 50 % PNIPAM–50 % CMC physical blend in aqueous solution, at 6 g/L, as viscosity rose when temperature was increased to a range of 25–40 °C. Similar thermothickening behavior was observed for the 25 % CMC–75 % PNIPAM physical blend in solution, at a total polymer concentration of 2 g/L. These results provide new information for preparing physical blends in aqueous solutions exhibiting thermothickening behavior, indicating that this behavior depends on total polymer concentration and composition of the mixture. |
| Databáze: | OpenAIRE |
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