Results 11 to 20 of about 74,679 (236)

Paving the Way towards Sustainability of Polyurethanes: Synthesis and Properties of Terpene-Based Diisocyanate

Molecules, 2023
Due to growing concerns about environmental issues and the decline of petroleum-based resources, the synthesis of new biobased compounds for the polymer industry has become a prominent and timely topic.
Aliénor Delavarde, Sebastien Lemouzy, Aurélien Lebrun, Julien Pinaud, Sylvain Caillol   +4 more
doaj   +1 more source

Synthesis and biological evaluation of novel urea and thiourea derivatives of valacyclovir [PDF]

Journal of the Serbian Chemical Society, 2014
A series of novel urea and thiourea derivatives of valacyclovir were efficiently synthesized in high yields and evaluated their antiviral activity.
Katla Ramana Venkata, Syed Rasheed, Golla Madhava, Shaik Adam, Chamarthi Raju Naga   +4 more
doaj   +1 more source

Synthesis and Properties of 1,3-Disubstituted Ureas Containing (Adamantan-1-yl)(phenyl)methyl Fragment Based on One-Pot Direct Adamantane Moiety Inclusion

Molecules, 2023
A one-stage method for the preparation of 1-[isocyanato(phenyl)methyl]adamantane containing a phenylmethylene fragment located between the adamantane fragment and the isocyanate group, and 1-[isocyanato(phenyl)methyl]-3,5-dimethyladamantane with ...
Vladimir D’yachenko, Dmitry Danilov, Yaroslav Kuznetsov, Semyon Moiseev, Vladimir Mokhov, Vladimir Burmistrov, Gennady Butov   +6 more
doaj   +1 more source

Synthesis, enzyme inhibition and anticancer investigation of unsymmetrical 1,3-disubstituted ureas [PDF]

Journal of the Serbian Chemical Society, 2014
In this research work seventeen urea derivatives, including five new derivatives N-mesityl-N'-(3-methylphenyl)urea (2), N-(3-methoxyphenyl)-N'-(3-methylphenyl)urea (4), N-mesityl-N'-(4-methylphenyl)urea (6), N-(1,3-benzothiazol-2-yl)-N'-(3 ...
Mustafa Sana, Perveen Shahnaz, Khan Ajmal   +2 more
doaj   +1 more source

Sustained Release Drug Delivery Applications of Polyurethanes

Pharmaceutics, 2018
Since their introduction over 50 years ago, polyurethanes have been applied to nearly every industry. This review describes applications of polyurethanes to the development of modified release drug delivery.
Michael B. Lowinger, Stephanie E. Barrett, Feng Zhang, Robert O. Williams   +3 more
doaj   +1 more source

Isocyanate toughened pCBT: Reactive blending and tensile properties

eXPRESS Polymer Letters, 2013
Cyclic butylene terephthalate oligomers (CBT) were reacted in a ring-opening polymerization with three types of isocyanates: a bifunctional aromatic type, a bifunctional aliphatic type and a polymeric aromatic isocyanate.
T. Abt, M. Sanchez-Soto, A. Martinez de Ilarduya, J. J. Bou   +3 more
doaj   +1 more source

The Effects of Acetylated Poplar Particles on Applicational Properties of manufactured Particleboards with Isocyanate Resin [PDF]

تحقیقات علوم چوب و کاغذ ایران, 2009
The capability of acetylated poplar particles with isocyanate resinin manufacturing particleboard was investigated. The acetylation degrees at high, medium, and zero (control) levels and type of resin (isocyanate and urea formaldehyde) were considered as
Hamideh Abdolzadeh, Kazem Doost hosseini
doaj   +1 more source

UV Laser-Induced Photodecomposition of Matrix-Isolated Salicylhydroxamic Acid: Identification of New Isocyanate Complexes

Molecules
Photochemical 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

Synthesis of 2-Azetidinones via Cycloaddition Approaches: An Update

Reactions
The 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, Donatella Giomi, Fabrizio Machetti   +2 more
doaj   +1 more source

Bio-based light-healing isocyanate-free polyurethanes derived from carbonated soybean oil and coumarin

Green Chemistry Letters and Reviews, 2023
In response to environmental concerns and restrictions on isocyanate-based materials, researchers and the coatings industry are focused on developing eco-friendly isocyanate-free polyurethanes.
Karteek Boga, Nikhil Rambharosh Dhore, Aruna Palanisamy, Antonio F. Patti, John C. Warner, George P. Simon, Kei Saito   +6 more
doaj   +1 more source