Influence of Chitosan on Orientation–Micellar Ordering of the Pluronic F-127 Gel Phase in an Aqueous Medium.
- Resource Type
- Article
- Authors
- Gegel', N. O.; Kharlamov, V. N.; Shipovskaya, A. B.
- Source
- Optics & Spectroscopy. Apr2022, Vol. 130 Issue 4, p257-261. 5p.
- Subject
- *CHITOSAN
*POLYMER colloids
*PHASE transitions
*POLARIZATION microscopy
*YIELD stress
*BINARY mixtures
*DICHROISM
- Language
- ISSN
- 0030-400X
The influence of chitosan on orientation–micellar association of Pluronic F-127 in an aqueous medium in the temperature range of 4–37°C has been studied by polarization microscopy and rotational viscometry. It is established that, with an increase in temperature, this amphiphilic copolymer undergoes a phase transition to a shape-stable hydrogel, characterized by optical dichroism and rheograms of viscosity with the yield stress. Chitosan additive suppresses the effect of optical anisotropy and influences the gel-formation time and viscoelastic characteristics of the binary mixture with implementation of flow curves of dilatant fluids or structured compositions with different degrees of micellar ordering. The optical texture of the macroscopic gel phase of Pluronic F-127 and its mixtures with chitosan is found to correlate with the viscoelastic properties of the polymer system. [ABSTRACT FROM AUTHOR]