Home About us Contact
|
Home About us Contact | ||
|
|
||
Imide Groups (imide + groups)
Selected AbstractsSynthesis of polyetherols with isocyanuric ring.INTERNATIONAL JOURNAL OF CHEMICAL KINETICS, Issue 8 2009Kinetics, ethylene carbonate, mechanisms of reactions, part 1: Reaction between isocyanuric acid The reaction between isocyanuric acid and ethylene carbonate results in the formation of polyetherols. The kinetic and mechanistic studies revealed that the initial step of the reaction is zero order related to ethylene carbonate. The rate-limiting step is the decomposition of an intermediating dianion of ethylene dicarbonate into ethane-1,2-diolate dianion and carbon dioxide. Imide groups of isocyanuric acid inhibit the reaction. The mechanism of reaction was confirmed by spectroscopic methods. © 2009 Wiley Periodicals, Inc. Int J Chem Kinet 41: 512,522, 2009 [source] Synthesis of polyetherols with isocyanuric ring: Kinetics and mechanisms of reactions in the presence of DABCO as catalystINTERNATIONAL JOURNAL OF CHEMICAL KINETICS, Issue 9 2010Jacek Lubczak To establish the mechanism of reaction of formation of oligoetherols with perhydro-1,3,5-triazine ring, the kinetics of reaction of isocyanuric acid and 1,3,5-tris(2-hydroxyetyl) isocyanurate with ethylene carbonate resulting in formation of polyetherols in the presence of diazabicyclo[2.2.2]octane as a catalyst has been investigated. The kinetic and mechanistic studies revealed that the initial step of reaction is zero order related to ethylene carbonate and the reaction is inhibited by imide groups of isocyanuric acid. The mechanism of reaction was confirmed by spectroscopic and electrochemical methods. © 2010 Wiley Periodicals, Inc. Int J Chem Kinet 42: 550,561, 2010 [source] Polyimides based on new diamines having pendant imide groupsJOURNAL OF POLYMER SCIENCE (IN TWO SECTIONS), Issue 24 2005Hans R. Kricheldorf Abstract New aromatic diamines were prepared in two steps from 4,5-dichlorophthalic anhydride and primary amines. The resulting 4,5-dichlorophthalimide was reacted with 4-mercaptoaniline, so that the chloroatoms were substituted by the mercapto groups (via the sulfide anions). The new diamines were polycondensed either with the diphenyl ether 3,3,,4,4,-tetracarboxylic anhydride or with bicyclooctane tetracarboxylic anhydride. These polycondensations were conducted in boiling m -cresol with azeotropic removal of water. The isolated polyimides were characterized by viscosity measurement, IR-spectroscopy, elemental analyses, and MALDI-TOF mass spectrometry. The mass spectra evidenced a high content of cyclic polyimides, indicating nearly perfect reaction conditions. The mass spectra also proved the formation of copolymers containing one diamine with a trialkylamine group in the side chain. High glass transition temperatures but a low crystallization tendency were found by DSC measurements. © 2005 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 43: 6272,6281, 2005 [source] Substituent chemical shifts of N -arylsuccinanilic acids, N -arylsuccinimides, N -arylmaleanilic acids, and N -arylmaleimidesMAGNETIC RESONANCE IN CHEMISTRY, Issue 9 2009Hye Sun Lee Abstract NMR spectra of a series of N -arylsuccinanilic acids, N -arylsuccinimides, N -arylmaleanilic acids, and N -arylmaleimides were examined to estimate the electronic effect of the amide and imide groups on the chemical shifts of the hydrogen and carbon nuclei of the benzene ring. Copyright © 2009 John Wiley & Sons, Ltd. [source] Synthesis and characterization of novel diimide,dinaphthols and resulting poly(urethane,imide)sPOLYMER INTERNATIONAL, Issue 9 2003Shahram Mehdipour-Ataei Abstract Novel diols containing imide groups were prepared via condensation of aromatic dianhydrides with 5-amino-1-naphthol. The diimide,dinaphthols prepared were characterized by conventional methods and used to synthesize new poly(urethane,imide)s (PUIs). All the polymers were characterized and their physical properties, such as solubility, solution viscosity, thermal stability, and thermal behaviour were studied. The polymers obtained showed more thermal stability than typical polyurethanes because of the presence of the imide groups. Copyright © 2003 Society of Chemical Industry [source] | |||||||||||||