Solubility and Phase Transfer of Insoluble Dyes in Organic Solvent by Polyurethane Reverse Micelle

Document Type : Research Paper

Authors

1 Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Ardabil, Iran

2 Department of Chemistry, Faculty of Science, University of Mohaghegh Ardabili, Postal Code 11367-56199, Ardabil, Iran

3 Department of Polymer, Faculty of Chemistry, Shahid Beheshti University, Postal Code 1983969411, Tehran, Iran

Abstract

Hypothesis: Amphiphilic systems present efficient ability in solublizing insoluble compounds by self-association to micellar structures. Polyurethanes with amphiphilic feature as polymeric assembling species illustrate specific characteristics such as H-bond assisting stability of arranged structures and functionalizing possibilty. In this respect, an amphiphilic random polyurethane (APU) synthesized from olive oil-based fatty acid was characterized for micellization in non-polar organic invironment along with its loading and transfering capability for insoluble dyes.
Methods: The solution of APU in non-polar organic solvent, toluene, at different concentrations was evaluated by turbidimetry and viscometry methods to realize the possibility of micelle formation and determine the aggregation point (RCMC). Morphology of the nanoparticles was investigated by field emision scanning electron microscopy (FE-SEM), atomic force microscopy (AFM) and dynamic light scattering (DLS). Capability of these polymeric micells as nano-carrier in encapsulating and solublizing of fushine hydrophilic dye in toluene as well as in phase transfering some hydrophilic cationic dyes from aqueous phase to toluene was investigated. Quantitative transferring capacity was spectroscopically evaluated by recording UV-Vis spectra of the dyes.
Findings: APU showed successful self-association into revers micelle at low critical concentration (0.02 mg/mL), expreesing efficent intermolecular interaction between hydrophilic segments of the polymer. Solvating capability of APU in the non-polar organic medium for hydrophilic dyes and phase transfer of this type of dyes from aqueous phase to organic phase illustrate the formation of assembled structures of APU with core-shell nature in the organic solvent and the embedding ability of APU. On the other hand, the reverse micelles formed in the organic phase were able to transfer cationic dyes from aqueous solution to organic medium. Based on the obtained results, APU can be utilized in removing cationic dyes from contaminated water and drug delivering process..

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