5 research outputs found
The Influence of the Composition and Structure of Nitrogen-Containing Phenol Formaldehyde Oligomers on Their Dynamic Viscosity
Synthesis of Silicon-Containing Chitosan Hydrogels in a Glycolic Acid Medium
The present paper considers a āone-potā green sol-gel synthesis of hybrid inorganic/organic hydrogels based on chitosan glycolate by using organically modified silica Si(OGly)4Ā·2GlyOH as a precursor to form a network of ā”SiāOāSiā” bonds at 4, 20, and 37Ā°C. The gelation time of the multicomponent chitosan-containing system was estimated as a function of the composition (the polymer template and precursor concentrations, introduction of a low-molecular-weight accelerator NaCl) and gelation conditions (the pH and temperature of the sol-gel process). It has been shown that an increased polymeric salt concentration, the introduction of an accelerator, and increased pH and temperature accelerate the gel-forming process