Results 101 to 110 of about 126,507 (309)

Preparation and Evaluation of Glucose Based Non-Isocyanate Polyurethane Self-Blowing Rigid Foams

Polymers, 2019
A partially biobased self-blowing and self-hardening polyurethane foam from glucose-based non-isocyanate polyurethanes (g-NIPU) was prepared by reaction of glucose with dimethyl carbonate and hexamethylene diamine.
Xue-Dong Xi, A. Pizzi, C. Gérardin, H. Lei, Xinyi Chen, S. Amirou   +5 more
semanticscholar   +1 more source

Photochemical Generation and Spectroscopic Characterization of Parent 3‐Iminooxetane and 3‐Oxazoline From 3‐Azidooxetane

Chemistry – A European Journal, EarlyView.
Two previously uncharacterized heterocyclic imines, 3‐iminooxetane and 3‐oxazoline, are generated simultaneously by irradiation of 3‐azidooxetane under matrix isolation conditions. The infrared spectra provide reference data for future gas‐phase studies and may facilitate their search in the interstellar medium.
Mika Maehara, Christian Thiehoff, Olga Vorobyova, Adrián Portela‐González, André K. Eckhardt   +4 more
wiley   +1 more source

Synthesis and crystal structure of [1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene](isocyanato-κN)gold(I)

Acta Crystallographica Section E: Crystallographic Communications
The title complex, [Au(NCO)(C27H36N2)], was synthesized by ligand metathesis from [1,3-bis(2,6-diisopropylphenyl)imidazol-2-ylidene]gold(I) chloride and sodium cyanate in anhydrous tetrahydrofuran and crystallized from toluene at 233 K in the ...
Abolghasem Bakhoda
doaj   +1 more source

Thermolysis of Semicarbazones to the Corresponding Azines Through Reactive N-Substituted Isocyanate Intermediates

Molecules, 2000
Thermolysis of semicarbazones (I) to azines (II) occurs through reactive N-substituted isocyanate intermediates (Ia) which can be converted in situ to carbamates and Nsubstituted ureas.
N. K. Chudgar, S. N. Shah
doaj   +1 more source

The interfacial interaction between isocyanate and stainless steel

International Journal of Adhesion and Adhesives, 2019
The interfacial interactions between methylene diphenyl di-isocyanate (MDI) and polymeric MDI (PMDI) with 316L stainless steel have been studied in order to understand the adhesion properties of polyurethane based adhesives (containing free isocyanate ...
S. Tardio, Marie-Laure Abel, R. Carr, J. Watts   +3 more
semanticscholar   +1 more source

Study on Characteristic of Aqueous Polymer Isocyanate Curing Reaction

, 2010
In this study the effect of isocyanate at room temperature on the curing behavior of PVAc was investigated. Crosslinking reactions are one of the most commonly used techniques to improve physical properties of PVAc.
Li Bin Zhu, Yan Hua Zhang, Jun Shen, Ji You Gu, Hai Yan Tan   +4 more
core   +1 more source

Learning Strategies from Nature's Blueprint to Cyclic Carbonate Synthesis

ChemSusChem, Volume 18, Issue 6, March 15, 2025.
The development of sustainable synthetic methods for cyclic carbonates draws inspiration from nature, focusing on eco‐friendly processes and renewable resources like CO2 and biomass. This review explore various CO2 activation mechanisms, green chemistry principles, and green catalysts.
Erika Saccullo, Vincenzo Patamia, Chiara Zagni, Antonio Rescifina, Giuseppe Floresta   +4 more
wiley   +1 more source

Associations Between Glutathione-S-Transferase Genotypes and Bronchial Hyperreactivity Patients With Di-isocyanate Induced Asthma. A Follow-Up Study

Frontiers in Medicine, 2019
Introduction: Di-isocyanates TDI (toluene di-isocyanate), MDI (diphenylmethane di-isocyanate), and HDI (hexamethylene di-isocyanate) are the most common chemicals causing occupational asthma. Di-isocyanate inhalation has been reported to induce oxidative
Jussi Leppilahti, Jussi Leppilahti, Marja-Leena Majuri, Timo Sorsa, Timo Sorsa, Timo Sorsa, Ari Hirvonen, Ari Hirvonen, Päivi Piirilä   +8 more
doaj   +1 more source

Formamides as Isocyanate Surrogates: A Mechanistically-Driven Approach to the Development of Atom-Efficient, Selective Catalytic Syntheses of Ureas, Carbamates and Heterocycles.

Journal of the American Chemical Society, 2019
Despite the hazardous nature of isocyanates, they remain key building blocks in bulk and fine chemical synthesis. By surrogating them with less potent and readily available formamide precursors, we herein demonstrate an alternative, mechanistic approach ...
Jeffrey Bruffaerts, N. von Wolff, Y. Diskin-Posner, Yehoshoa Ben-David, D. Milstein   +4 more
semanticscholar   +1 more source

Mitigating surcharge‐induced column‐head cracking in double‐deck shield tunnels using hyperelastic bearing joints

Deep Underground Science and Engineering, EarlyView.
A staged three‐dimensional nonlinear soil–structure interaction (SSI) model is established, in which the initial geostress state, tunnel excavation, lining installation, delayed activation of the internal frame, and subsequent surcharge loading are simulated sequentially.
Xinyu Liu, Xiang Ci, Weizhong Chen, Jianping Yang   +3 more
wiley   +1 more source