Publications by authors named "R S Davletbaev"
Based on organophosphorus branched polyols (AEPAs) synthesized using triethanolamine (TEOA), -phosphoric acid (OPA), and polyoxyethylene glycol with MW = 400 (PEG), vapor-permeable polyurethane ionomers (AEPA-PEG-PUs) were obtained. During the synthesis of AEPAs, the reaction of the OPA etherification with polyoxyethylene glycol was studied in a wide temperature range and at different molar ratios of the starting components. It turned out that OPA simultaneously undergoes a catalytically activated etherification reaction with triethanolamine and PEG.
View Article and Find Full Text PDFThe influence of stable-to-self-condensation Cu(II)-coordinated polyoxyethylene-substituted silicas (ASiP-Cu-0.5) on the synthesis of microporous block copolymers (OBCs) whose structural feature is the existence of coplanar polyisocyanate blocks of acetal nature (O-polyisocyanates) and a flexible-chain component of amphiphilic nature was studied. The use of ASiP-Cu-0.
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- Researchers created two types of polysiloxanes (cubic and linear) with branches made of polyoxyethylene using specific chemicals, finding that these new materials don't easily self-condense.* -
- A detailed study showed how varying the amount of copper chloride affects the structure of these polysiloxanes and their ability to improve the absorption characteristics of certain membranes made from block copolymers.* -
- The developed membranes demonstrated increased sorption capacity and high permeability for organic dyes and metal ions, which linked their internal structures to successful chemical reactions involving an analytical reagent (PAN) and copper chloride.*
Article Synopsis
- Researchers developed polyurethane membranes that allow vapor to pass through using aminoethers of boric acid (AEBA), modified with bulk adducts from diphenylol propane diglycidyl ether and ethanolamine (EM).
- These modifications reduced the size of AEBA-EM particles and their viscosity, which helped the membranes become more permeable to vapor.
- The enhanced vapor permeability, which was tripled in the modified polyurethanes, occurs due to reduced cluster size that creates channels for water molecules, improving the membranes' efficiency in dehydrating isopropanol.
Article Synopsis
- The study focuses on the etherification reaction of -phosphoric acid (OPA) with polyoxypropylene glycol, using triethanolamine (TEOA) and triethylamine (TEA) as catalysts under low-temperature conditions.
- It finds that triethylamine leads to complete etherification, resulting in branched OPA ethers and possible polyphosphate structures, while triethanolamine causes incomplete etherification, leaving some phosphate anions unreacted.
- The research also includes an analysis of the kinetics of the reaction and the properties of polyurethane ionomer films created from aminoethers of -phosphoric acid (AEPA).