Results 111 to 120 of about 25,950 (266)

N-heterocyclic carbene-catalyzed atroposelective synthesis of N-Aryl phthalimides and maleimides via activation of carboxylic acids

Nature Communications
Traditionally, N-aryl phthalimides are synthesized by the condensation of phthalic anhydride and aniline derivatives, usually proceeding under harsh conditions.
Soumen Barik, Sowmya Shree Ranganathappa, Akkattu T. Biju   +2 more
doaj   +1 more source

Polyimide molding powder, coating, adhesive, and matrix resin [PDF]

, 1992
The invention is a polyimide prepared from 3,4'-oxydianiline (3,4'-ODA) and 4,4'-oxydiphthalic anhydride (ODPA), in 2-methoxyethyl ether (diglyme). The polymer was prepared in ultra high molecular weight and in a controlled molecular weight form which ...
Progar, Donald J., St.clair, Terry L.
core   +1 more source

Accumulation, sources, and health risks of phthalic acid esters (PAEs) in road dust from heavily industrialized, urban and rural areas in southern Iran. [PDF]

Heliyon, 2023
Karamianpour J, Arfaeinia H, Ranjbar Vakilabadi D, Ramavandi B, Dobaradaran S, Fazlzadeh M, Torkshavand Z, Banafshehafshan S, Shekarizadeh H, Ahmadi S, Badeenezhad A.   +10 more
europepmc   +1 more source

Study of improved resins for advanced supersonic technology composites. Part 1: Heteroaromatic polymers containing ether groups. Part 2: Curing chemistry of aromatic polymers and composite studies [PDF]

Fourteen ether-containing, aromatic dianhydrides have been synthesized from N-phenyl-3 or 4-nitrophthalimide and various bisphenols. The process involves nucleophilic displacement of activated nitro groups with bisphenolate ions.
Hillig, W. B., Mellinger, G. A., Takekoshi, T.   +2 more
core   +1 more source

Polyimides with improved compression moldability [PDF]

, 1993
The semicrystalline polyimide prepared by reaction of 3,3',4,4' benzophenonetetracarboxylic (BTDA) and 1,3-bis(4-aminophenoxy 4' benzoyl) benzene (1,3-BABB) is modified so that it can be more readily processed to form adhesive bonds, moldings, and ...
Beltz, Mark W., Havens, Stephen J., Hergenrother, Paul M.   +2 more
core   +1 more source

Identification of Organic Compounds in Wood and Bark of Persian Oak Having Different Levels of Crown Dieback Using Gas Chromatography-Mass Spectrometry

BioResources
The influence of environmental factors on variations in organic compound content of sapwood and inner bark of mature Persian oaks were investigated in the Zagros forests, western Iran.
Hamid R. Naji, Ayoub Azimi, Ramin Vaysi, Forough Soheili   +3 more
doaj  

Polyimide Matrix composites: Polyimidesulfone/LARC-TPI (1:1) blend [PDF]

Polyimide matrix composites were fabricated from unidirectional unsized AS-4 carbon fiber and a doped 1:1 blend of two polyimides: benzophenone dianhydride-3,3'-diamino diphenylsulfone (PISO2) and benzophenone dianhydride-3,3'-diamino benzophenone (LARC ...
Baucom, Robert M., Johnston, Norman J., St.clair, Terry L., Towell, Timothy W.   +3 more
core   +1 more source

Investigation of the Presence and Possible Migration from Microplastics of Phthalic Acid Esters and Polycyclic Aromatic Hydrocarbons

, 2020
Małgorzata Kida, Piotr Koszelnik
openalex   +1 more source

Vinyl capped addition polyimides [PDF]

Polyimide resins (PMR) are generally useful where high strength and temperature capabilities are required (at temperatures up to about 700 F). Polyimide resins are particularly useful in applications such as jet engine compressor components, for example,
Delvigs, Peter, Malarik, Diane C., Vannucci, Raymond D.   +2 more
core   +1 more source

Investigating the Permeation Mechanism of Typical Phthalic Acid Esters (PAEs) and Membrane Response Using Molecular Dynamics Simulations. [PDF]

Membranes (Basel), 2022
Bao Y, Li M, Xie Y, Guo J.
europepmc   +1 more source