Polyurethanes were synthetised using 1,4-butanediol polyadipate (Hoopol F-580 Synthesia Technology, Barcelona, Spain) (Mw= 3000 g/mol, IOH = 37–40 mg KOH/g) as polyol and 4,4-diphenylmethane diisocyanate (MDI) (Sigma Aldrich, Barcelona, Spain) as isocyanate. Furfurylamine (Sigma Aldrich, St. Louis, MO, USA) and 1,1′-(methylenedi-4,1-phenylene) bismaleimide (BMI) (BLDpharm, Kaiserslautern, Germany) were utilised for the functionalisation of the adhesive. 1,4-butanediol (99% purity, Thermo Scientific Chemicals, Madrid, Spain) was used as chain extender and Desmodur RFE (Bayer, Leverkusen, Germany) as crosslinker.
Desmodur rfe
Manufactured by Bayer
Sourced in Germany
Desmodur RFE is a polyisocyanate resin used in the production of coatings, adhesives, and sealants. It serves as a crosslinking agent that improves the durability and chemical resistance of the final product. The specific details and intended applications of Desmodur RFE may vary depending on the customer's requirements.
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2 protocols using desmodur rfe
1
Polyurethane Adhesive Synthesis and Functionalization
2
Potentiometric Sensor Membrane Fabrication
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Tetrahydrofuran (THF) and high molecular weight poly(vinyl chloride) (PVC), potassium tetrakis(4-chlorophenyl)borate (KTpCIPB), ammonium ionophore I (nonactin), bis(2ethylhexyl) sebacate (BEHS), and dibutyl phthalate (DBP) tetradodecylammonium nitrate (TDDAN) were purchased from Sigma-Aldrich and used without further purification in the preparation of the membranes. Graphite (Sigma-Aldrich, USA), epoxy (Macroplast Su 2227, Henkel, Germany), and hardener (Desmodur RFE, Bayer AG, Germany) were used in the preparation of the solid contact material. All cationic and anionic standard solutions were prepared using analytical grade nitrate or chloride salts, sodium, or potassium salts, respectively. Ultrapure water (18.2 MΩ cm -1 ) was obtained via an ultrapure system Purelab Flex 4 (ELGA LabWater, UK). All ISE potentials were measured against the silver/silver chloride reference electrode, which was elaborated in our laboratory.
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