Results 121 to 130 of about 56,210 (306)

Synthesis, Modification and Prospect of Bio-based Polyurethane

Pige Kexue Yu Gongcheng
Bio-based polyurethane is a type of polyurethane material primarily derived from natural bio-based raw materials, synthesized through the reaction of bio-based polyols and bio-based isocyanates.
Kangjia SONG, Feifei ZHANG, Jie LIU, Liqiang JIN, Deyi ZHU   +4 more
doaj   +1 more source

Nitrogen Chemistry Significant to Primordial Systems Semiannual Report, 1 Jul. - 31 Dec. 1966 [PDF]

Deoxygenation of benzoyl cyanide, studies of vinyl nitrenes and diene isocyanates, and other aspects of nitrogen chemistry significant to primordial biological ...
Boyer, J. H.
core   +1 more source

Flexible Phase Change Bandage Incorporated With Zeolite for Temperature‐Controlled Wound Hemostasis

ENERGY &ENVIRONMENTAL MATERIALS, EarlyView.
A novel flexible hemostatic phase change bandage (HPB) was designed and constructed through chemical cross‐linking and electrospinning to mitigate thermal injury and broaden the application of PCMs in the medical field. Furthermore, the flexible HPB shows thermal stability, strong mechanical strength, excellent infiltration, and reliable thermal ...
Xinyu Zhang, Keyan Sun, Hanqing Liu, Shihui Zhang, Yan Kou, Haocheng Fu, Zicheng Lu, Yongfei Zhao, Quan Shi   +8 more
wiley   +1 more source

Surface modified aerogel monoliths [PDF]

, 2013
This invention comprises reinforced aerogel monoliths such as silica aerogels having a polymer coating on its outer geometric surface boundary, and to the method of preparing said aerogel monoliths.
Johnston, James C., Kuczmarski, Maria A., Leventis, Nicholas, Meador, Mary Ann B.   +3 more
core   +1 more source

Synthesis of Sulfur Heterocycles by Palladium‐Catalyzed Cyclization

European Journal of Organic Chemistry, EarlyView.
In spite of the well‐known palladium thiophilicity, sulfur‐containing acyclic substrates may efficiently undergo several different kinds of palladium‐catalyzed cyclization processes leading to highly important sulfur heterocycles in one synthetic step. Advances in this challenging and stimulating field of research are presented in this review.
Bartolo Gabriele
wiley   +1 more source

Rh(III)-catalyzed directed C–H bond amidation of ferrocenes with isocyanates

Beilstein Journal of Organic Chemistry, 2012
[RhCp*(OAc)2(H2O)] [Cp* = pentamethylcyclopentadienyl] catalyzed the C–H bond amidation of ferrocenes possessing directing groups with isocyanates in the presence of 2 equiv/Rh of HBF4·OEt2.
Satoshi Takebayashi, Tsubasa Shizuno, Takashi Otani, Takanori Shibata   +3 more
doaj   +1 more source

A Novel Air‐Liquid Interface Exposure System for Continuous Gas Exposure of Airway Epithelial Cells: Exposure of NO2 With Viral Co‐Challenge

Journal of Applied Toxicology, EarlyView.
ABSTRACT Most in vitro toxicological research investigating the effects of inhaled compounds employ short‐term exposures of a couple of hours, or repeated, intermittent exposures for a limited number of days with exposure free periods, whereas in reality, we are continuously exposed, albeit to variable concentrations.
Marcia M. Oldenburger, Evert Duistermaat, Pieter S. Hiemstra, Flemming R. Cassee, Yvonne C. M. Staal   +4 more
wiley   +1 more source

Occupational allergic and irritant contact dermatitis in workers exposed to polyurethane foam

International Journal of Occupational Medicine and Environmental Health, 2014
Objectives: To evaluate sensitization to chemicals present in work environment after an outbreak of contact dermatitis in workers of vehicle equipment factory, exposed to polyurethane foam, based on 4,4'-diphenylmethane diisocyanate (MDI).
Marta Kieć-Świerczyńska, Dominika Świerczyńska-Machura, Dorota Chomiczewska-Skóra, Ewa Nowakowska-Świrta, Beata Kręcisz   +4 more
doaj  

Catalyst‐Free Mass Polymerization and Characterization of Bio‐Polyhydroxhyurethanes Based on Resorcinol Bis(Cyclocarbonate)

Macromolecular Materials and Engineering, EarlyView.
Non‐isocyanate polyhydroxyurethanes (PHUs) were synthesized from resorcinol bis(cyclocarbonate) and eco‐friendly diamines under mild, catalyst‐free conditions. The resulting polymers were extensively characterized for their structural, thermal, and mechanical properties, as well as processability and adhesion performance.
Federico Olivieri, Noemi Faggio, Giovanni Dal Poggetto, Chiara Santillo, Roberto Avolio, Rachele Castaldo, Mariacristina Cocca, Maria Emanuela Errico, Marino Lavorgna, Gennaro Gentile   +9 more
wiley   +1 more source

Interfacial Energy and Composition Controlled Self‐Stratification in Polyurethane Coatings

Macromolecular Materials and Engineering, EarlyView.
This study elucidates self‐stratification in polyurethane coatings driven by interfacial energies and composition‐dependent phase separation. Using XPS, SIMS, and Raman analyses, we reveal rapid formation of hydrophobic and hydrophilic layers and substrate‐dependent interfacial structures.
Gaurav Singhal, Lihong Lao, Michaeleen L. Pacholski, Harshad Shah, Junsi Gu, Bryan Caruso, Fabio Aguirre‐Vargas, Piyush Singh, Kshitish A. Patankar, Simon A. Rogers, Charles M. Schroeder, Paul V. Braun   +11 more
wiley   +1 more source