Results 31 to 40 of about 20,442 (252)
Isocyanate-Functionalized Chitin and Chitosan as Gelling Agents of Castor Oil
Molecules, 2013 The main objective of this work was the incorporation of reactive isocyanate groups into chitin and chitosan in order to effectively use the products as reactive thickening agents in castor oil.
José M. Franco +3 more
doaj +1 more source
Advanced Functional Materials, EarlyView.A series of ACHPES‐based hydrogels are developed and realizing multiple functions like anti‐fouling properties, alkali‐induced color/fluorescence‐changing ability and strain sensing. Furthermore, the hydrogels show excellent anti‐freezing performance, whose optical, mechanical and electrical properties remain stable at −47.3 °C.
Gaopeng Wang +9 more
wiley +1 more source
Synthesis of 2-Azetidinones via Cycloaddition Approaches: An Update
ReactionsThe present review is a comprehensive update of the synthesis of monocyclic β-lactams via cycloaddition reactions. According to the IUPAC definition of cycloaddition, both elementary and stepwise processes (formal cycloadditions) have been considered ...
Franca Maria Cordero +2 more
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2017 It has been found that 2,7-di-tert-butylpyrene reacts with aliphatic iso(thio)cyanates in the presence of trifluoromethanesulfonic acid to exclusively afford the corresponding 1-substituted (thio)amides in high yields.
Anna Wrona-Piotrowicz +3 more
doaj +1 more source
Hydrogenation at low temperatures does not always lead to saturation: the case of HNCO [PDF]
A&A 576, A91 (2015), 2015 Context. It is generally agreed that hydrogenation reactions dominate chemistry on grain surfaces in cold, dense molecular cores, saturating the molecules present in ice mantles. Aims. We present a study of the low temperature reactivity of solid phase isocyanic acid (HNCO) with hydrogen atoms, with the aim of elucidating its reaction network. Methods.
arxiv +1 more source
Advanced Functional Materials, EarlyView.Internally catalyzed siloxane dynamic chemistry is demonstrated resulting from amides covalently linked through alkyl chains to siloxanes. The alkyl length in the siloxane‐containing monomer tunes the network cross‐link density. Siloxane exchange dynamics are faster with increasing cross‐link density, because associative exchange is second order in ...
Nathan S. Purwanto +5 more
wiley +1 more source
MoleculesPhotochemical reactions of salicylhydroxamic acid were induced using tunable UV laser radiation followed by FTIR spectroscopy. Four pairs of co-products were experimentally found to appear in the photolysis: C6H4(OH)NCO⋯H2O (1), C6H4(OH)C(O)N⋯H2O (2 ...
Magdalena Sałdyka, Zofia Mielke
doaj +1 more source
Beilstein Journal of Organic Chemistry, 2015 The structures of two derivatives of the bisdioxine diisocyanate 1, the bisurea 4 and the biscarbamate 5, are established by X-ray crystallography and DFT calculations.
Gert Kollenz +4 more
doaj +1 more source
Kinetics of aqueous media reactions via ab initio enhanced molecular dynamics: the case of urea decomposition [PDF]
J. Phys. Chem. B 123 (2019) 6851-6856, 2019 Aqueous solutions provide a medium for many important reactions in chemical synthesis, industrial processes, environmental chemistry, and biological functions. It is an accepted fact that aqueous solvents can be direct participants to the reaction process and not act only as simple passive dielectrics.
arxiv +1 more source
Designing for Degradation: Transient Devices Enabled by (Nano)Cellulose
Advanced Materials, EarlyView.Recent progress in transient devices enabled by (nano)cellulosic materials is reviewed. Transiency mechanisms, advantages of nanocelluloses, and a suite of applications are discussed. A circular thinking approach coupled with life cycle assessment is applied to critically revisit the potential, advantages, and challenges of nanocellulose‐enabled ...
Lucas J. Andrew +2 more
wiley +1 more source