4580-40-9Relevant articles and documents
Preparation and properties of semi-interpenetrating networks combined by thermoplastic polyurethane and a thermosetting elastomer
Li, Yajin,Li, Guoping,Li, Jie,Luo, Yunjun
, p. 3087 - 3096 (2018)
A thermosetting elastomer has been introduced into hydroxyl-terminated polyether thermoplastic polyurethane systems by semi-interpenetrating technology. The novel energetic macromolecule materials are investigated by Fourier transform infrared spectroscopy (FTIR), uniaxial tensile test, dynamic mechanical analysis (DMA) and thermal gravimetric analysis (TGA). The results show that this material has good mechanical properties with a stress of 9.7 MPa and strain of 1010.7% when the mass percentage of triazole segments is 20 wt%. It is worth noting that the network structure parameters of semi-interpenetrating materials are quantitatively calculated for the first time based on the relationship between the elastic modulus and the effective crosslinking density. The damping analysis results show that the linear polyurethane domains are tightly embedded into the tridimensional network of triazole domains. In addition, it is confirmed from thermal stability and energy analysis that the samples exhibit good thermal stability and positive heat of formation. Therefore, the novel energetic materials are of potential applied value in the areas of aerospace industry and missile technology.
REDUCTION METHOD USING WATER AS PROTON SOURCE BY MEANS OF N-HETEROCYCLIC CARBENE
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Paragraph 0014; 0015; 0021, (2016/10/10)
PROBLEM TO BE SOLVED: To provide a reduction method using water as a proton source by means of N-heterocyclic carbene, in which the N-heterocyclic carbene is used actively as a reaction accelerator to realize a hydrogenation reaction by using water as the proton source. SOLUTION: A solution, which is obtained by mixing: a reaction substrate shown at an upper stage of the following formulae; a precursor of the triazole-based N-heterocyclic carbene (NHC) shown at a lower stage; water; and 1,2-dimethoxyethane being a solvent, is reacted at 100°C or higher temperature for 2 hours or more while making the solution to pass through a microwave reaction unit and the reacted solution is subjected to reduced-pressure distillation to obtain a hydrogenated product. The formulae: (EWG1-EWG4 are each an ester group, a cyano group, a ketone group, an amido group or an imido group;R1-R5 are each a 1-20C aliphatic group, a 3-12C alicyclic group or 6-30C aromatic group) SELECTED DRAWING: None COPYRIGHT: (C)2016,JPO&INPIT
Regioselective synthesis and antimicrobial studies of ester linked 1,4-disubstituted 1,2,3-bistriazoles
Lal, Kashmiri,Kumar, Ashwani,Pavan,Kaushik
body text, p. 4353 - 4357 (2012/07/28)
A series of 1,4-disubstituted 1,2,3-bistriazoles was synthesized via click chemistry by cycloaddition of various bisalkynes with benzyl/2-phenylethyl azide. Synthesized triazoles were characterized by IR, 1H NMR, 13C NMR and mass spe