Results 21 to 30 of about 56,210 (306)
Occupational exposure to selected isocyanates in Polish industry
Medycyna Pracy, 2015 Background: Isocyanates constitute a group of highly reactive, low molecular weight chemicals used worldwide for polyurethane manufacturing. The occupational exposure to these compounds is a major cause of occupational asthma, thus it is very important ...
Sławomir Brzeźnicki +1 more
doaj +1 more source
Spirometric measurement among polyurethane foam mattress-making workers of India
Indian Journal of Community Medicine, 2021 Background: The polyurethane foam (PUF) mattress-making workers are exposed to isocyanates which are known respiratory toxicants and cause effect on pulmonary volumes and flows.
Rajnarayan Ramshankar Tiwari +1 more
doaj +1 more source
Antitrust Aspects of Transatlantic Investment [PDF]
, 1969 In this diploma work a discrete cubic nonlinear Schrödinger equation (DNLS) is used as a model for the evolution of the electric field in a system of coupled waveguides with nonlinear index of refraction.The DNLS is inferred from Maxwell’s equations by ...
Fugate, Wilbur L.
core +4 more sources
Beilstein Journal of Organic Chemistry, 2022 An economical and versatile protocol for the one-pot synthesis of monomethylamines by reduction of N-substituted carbonylimidazoles with NaBH4/I2 in THF at reflux temperature is described. This method used no special catalyst and various monomethylamines
Lin Chen +5 more
doaj +1 more source
Journal of the American Chemical Society, 2019 A Cu-catalyzed borylative carboxamidation reaction has been developed using vinylarenes and isocyanates. Alkynes, branched 1,3-dienes and bicyclic alkenes were also found to be competent coupling partners.
Daniele Fiorito +3 more
semanticscholar +1 more source
Frontiers in Chemistry, 2019 Using isocyanate-functionalized Kraft lignin as a reactive macromonomer for the preparation of polyurethane foams by a prepolymer technique is a well-known strategy to incorporate the biomacromolecule into a higher value polymer material.
Mareike Zieglowski +9 more
doaj +1 more source
Investigations of catalysis of urethane formation using organotin dicarboxylate
Heliyon, 2020 The reaction mechanism of the urethane formation for both aliphatic and aromatic isocyanates in the presence of organotin dicarboxylate as a catalyst is investigated theoretically and experimentally.
Ransi Devendra +2 more
doaj +1 more source
Green Polyurethanes from Renewable Isocyanates and Biobased White Dextrins
Polymers, 2019 Polyurethanes (PUs) are an important class of polymers due to their low density and thermal conductivity combined with their interesting mechanical properties—they are extensively used as thermal and sound insulators, as well as structural and comfort ...
J. Konieczny, K. Loos
semanticscholar +1 more source
Gallium "Shears" for C=N and C=O Bonds of Isocyanates.
Chemistry, 2019 Digallane [L1 Ga-GaL1 ] (1, L1 =dpp-bian=1,2-[(2,6-iPr2 C6 H3 )NC]2 C12 H6 ) reacts with RN=C=O (R=Ph or Tos) by [2+4] cycloaddition of the isocyanate C=N bonds across both of its C=C-N-Ga fragments to afford [L1 (O=C-NR)Ga-Ga(RN-C=O)L1 ] (R=Ph, 3; R=Tos,
V. A. Dodonov +7 more
semanticscholar +1 more source
Thermal curing of an epoxy-anhydride system modified with hyperbranched poly(ethylene imine)s with different terminal groups [PDF]
, 2017 New hyperbranched polymers (HBP) have been synthesized by reaction of a poly(ethylene imine) with phenyl and t-butyl isocyanates. These HBPs have been characterized by 1H-NMR (nuclear magnetic resonance of hydrogen) and Fourier transform infrared ...
Acebo Gorostiza, Cristina +5 more
core +2 more sources