Formation of mesoglobules in aqueous media from thermo-sensitive poly(ethoxytriethyleneglycol acrylate) |
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Authors: | Natalia Toncheva-Moncheva Philip Dimitrov Christo B Tsvetanov Barbara Robak Barbara Trzebicka Andrzej Dworak Stanislav Rangelov |
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Affiliation: | (1) 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, ul. M. Curie-Sklodowskiej, 3441-800 Zabrze, Poland; |
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Abstract: | A series of six poly(ethoxytriethyleneglycol acrylate) (PETEGA) homopolymers were synthesized by atom transfer radical polymerization,
reversible addition-fragmentation transfer polymerization, and anionic polymerization in order to cover a molecular weight
range from 7,000 to 40,000 Da. The polymers exhibited a lower critical solution temperature (LCST) behavior in water, which
was observed by the occurrence of a cloud point (CP) at around 35 °C. The transmittance of visible light versus temperature
dependence overlapped during the cooling and the heating cycles, showing almost a complete lack of hysteresis. Moreover, instead
of the occurrence of an uncontrolled macroscopic phase separation, stable colloidal aggregates (mesoglobules) of narrow distribution
in particle size were formed in water at temperatures above the LCST of PETEGA at 1 g L−1 solutions. The dimensions of the mesoglobules ranged from 91 to 235 nm, and particle size was not influenced by the molecular
weight of PETEGA. Temperature changes caused considerable variations of the mesoglobules dimensions, which were smaller at
higher temperatures. The addition of an anionic surfactant simultaneously increased the CP values by 4–6 °C and lowered the
dimensions of the mesoglobules. |
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