Nanosized colloidal particles from thermosensitive poly(methoxydiethyleneglycol methacrylate)s in aqueous media |
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Authors: | Stanislav Rangelov Peter Simon Natalia Toncheva-Moncheva Philip Dimitrov Barbara Gajewska Christo B Tsvetanov |
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Affiliation: | (1) Laboratory of Polymerization Processes, Institute of Polymers, Bulgarian Academy of Sciences, Acad. G. Bonchev 103-A, 1113 Sofia, Bulgaria;(2) Centre of Polymer and Carbon Materials, Polish Academy of Sciences, 5 Sowinskiego St, 44-121 Gliwice, Poland;(3) Helmholtz-Zentrum Geesthacht, Centre for Materials and Coastal Research, Institute of Polymer Research, Max-Planck-Str. 1, 21502 Geesthacht, Germany;(4) Present address: Faculty of Life Sciences, Rhine-Waal University of Applied Sciences, Landwehr 4, 47533 Kleve, Germany; |
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Abstract: | 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. |
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