Nanosized colloidal particles from thermosensitive poly(methoxydiethyleneglycol methacrylate)s in aqueous media
| Autor: | Barbara Gajewska, Natalia Toncheva-Moncheva, Stanislav Rangelov, Christo B. Tsvetanov, Peter F. W. Simon, Philip Dimitrov |
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| Rok vydání: | 2012 |
| Předmět: |
chemistry.chemical_classification
Cloud point Aqueous solution Materials science Polymers and Plastics General Chemistry Polymer Condensed Matter Physics Methacrylate chemistry.chemical_compound Pulmonary surfactant chemistry Dynamic light scattering Chemical engineering Polymer chemistry Materials Chemistry Turbidimetry Sodium dodecyl sulfate |
| Zdroj: | Polymer Bulletin. 68:2175-2185 |
| ISSN: | 1436-2449 0170-0839 |
| DOI: | 10.1007/s00289-012-0724-z |
| Popis: | The formation of well-defined colloidal particles (mesoglobules) from the thermosensitive polymer poly(methoxydiethyleneglycol methacrylate) was observed in dilute aqueous solutions (0.5–1.0 g/L) by turbidimetry and dynamic light scattering (DLS). DLS measurements were performed at 70 °C and showed a strong influence of polymer molecular weight: the hydrodynamic diameters of the mesoglobules increased from ca. 160 to 330 nm with a relatively small, i.e., from 6,400 to 14,000, increase in molecular weight. The addition of sodium dodecyl sulfate (SDS) at surfactant/polymer ratios (s/p, g/g) ranging from 0.3 to 0.5 practically inhibited the clouding of the solutions as the initial transmittance decreased by only 10–30%. Furthermore, a dramatic shift of the original cloud point values taken as a 10% decrease in transmittance, by approximately 20–60 °C was registered upon the surfactant addition. The presence of SDS resulted in size reduction by 52–90% as indicated by DLS. |
| Databáze: | OpenAIRE |
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