Organogels polymers

Baran N, Singh VK, Pal K, Anis A, Pradhan DK, Pramanik K. Development and characterization of soy lecithin and palm oil based organogels. Polymer Plastic Technology and Engineering. 

Luisi, P. L., Scartazzini, R., Haering, G., and Schurtenberger, P. (1990). Organogels from water-in-oil microemulsions. Colloid Polymer ScL, 268, 356-74. 

Unprotected glycol-dendrimers, peptido- and redox-dendrimers and dendro-nized polymer organogels can also be prepared by click chemistry [18 c]. 

Pluronic copolymers with molecular weight of 11,500 have been used as a viscosity modifier and form a clear gel at 20 to 25% w/w in water. A solution of Pluronic undergoes a thermal gelation process in which a mixture of the polymer and water forms a clear solution at low temperature and then becomes a gel when raised to room temperature (above 21°C). A blend of Pluronic and lecithin is sold as Organogel for topical gel formulations. 

The phenomenology of physical organogels and jellies is extremely rich, and their comportments are similar in some aspects to those of both surfactants in solution (e.g., lyotropism and crystallization) and polymer solutions (6 (e.g.. swelling/shrinking behaviors and microscopic mass motion). Gels can be considered as being at the interface between complex fluids (i.e.. micellar systems) and phase-separated states of matter. The main properties and concepts appropriate to describe the gels and the basic principles of techniques for their study will be reviewed here. 

Mezzasalma S. A., Koper G. J. M. and Shchipunov Yu. A., Lecithin organogel as a binary blend of monodisperse polymer-like micelles. Langmuir 16 (2000) pp. 10564-10565. 

To evaluate the in-vivo gelation mechanism of the polymer, mice were injected with three different volumes of polymer. The polymer remained at the injection site and maintained its shape for 24h post injection as happens when oil is injected in the subcutaneous space. Based on data presented in this work we can classify poly(sebacic-co-ricinoleic acid) as in-situ organogel forming. 

Fibrous templates give rise to hollow fiber materials when the nanocoating technique is applied. This is demonstrated below for polymer fibers, a bacterial assembly, and organogelators. 

Polymer concentration Polymeric organogelators can induce gelation even at very low concentrations (less than 20 g/L). °... 

Suzuki M, Hanabusa K. Polymer organogelators that make supramolecular organogels through physical cross-linking and self-assembly. Chem Soc Rev. 39(2) (2010) 455-463. 

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