Results 21 to 30 of about 3,396 (226)

Synthesis and Characterization of Novel Cardanol Based Benzoxazines

Natural Product Communications, 2009
Benzoxazines are a class of phenolic compounds extensively studied in polymer science because of their properties as fiber reinforcements, fire-retardants and curing agents. In this article is described a solvent-less process, based on a Mannich reaction
Andrea Minigher, Elena Benedetti, Ornela De Giacomo, Pietro Campaner, Vincent Aroulmoji   +4 more
doaj   +1 more source

Crystal structure of 1,2-bis(6-bromo-3,4-dihydro-2H-benz[e][1,3]oxazin-3-yl)ethane: a bromine-containing bis-benzoxazine

Acta Crystallographica Section E: Crystallographic Communications, 2016
The title benzoxazine molecule, C18H18Br2N2O2, was prepared by a Mannich-type reaction of 4-bromophenol with ethane-1,2-diamine and formaldehyde. The title compound crystallizes in the monoclinic space group C2/c with a centre of inversion located at the
Augusto Rivera, Jicli José' Rojas, Jaime Ríos-Motta, Michael Bolte   +3 more
doaj   +1 more source

C—I...N short contacts as tools for the construction of the crystal packing in the crystal structure of 3,3′-(ethane-1,2-diyl)bis(6-iodo-3,4-dihydro-2H-1,3-benzoxazine)

Acta Crystallographica Section E: Crystallographic Communications, 2017
The asymmetric unit of the title compound, C18H18I2N2O2, consists of one half-molecule, completed by the application of inversion symmetry. The molecule adopts the typical structure for this class of bis-benxozazines, characterized by an anti orientation
Augusto Rivera, Jicli José Rojas, Jaime Ríos-Motta, Michael Bolte   +3 more
doaj   +1 more source

Crystal structure of 2,2′-(ethane-1,2-diyl)bis(2,3-dihydro-1H-naphtho[1,2-e][1,3]oxazine): a prospective raw material for polybenzoxazines

Acta Crystallographica Section E: Crystallographic Communications, 2017
In the title compound, C26H24N2O2, the oxazine moiety is fused to a naphthalene ring system. The asymmetric unit consists of one half of the molecule, which lies about an inversion centre.
Augusto Rivera, Juan E. Cepeda-Santamaría, Jaime Ríos-Motta, Michael Bolte   +3 more
doaj   +1 more source

A study on the co-reaction of benzoxazine and triazine through a triazine-containing benzoxazine

RSC Advances, 2016
To study the co-reaction of benzoxazine and triazine, a triazine-containing benzoxazine (P-tta) was prepared through nucleophilic substitution of 4-(2H-benzo[e][1,3]oxazin-3(4H)-yl)phenol (P-ap) with 2,4,6-trichloro-1,3,5-triazine.
Ching Hsuan Lin, Yu-Chun Chou, Meng Wei Wang, Ru Jong Jeng   +3 more
openaire   +1 more source

Main-Chain Benzoxazines Containing an Erythritol Acetal Structure: Thermal and Degradation Properties

Molecules, 2023
In this paper, the bio-based raw material erythritol was used to introduce an acetal structure into the benzoxazine resins. The benzoxazine-based resins containing an erythritol acetal structure could be degraded in an acidic solution and were ...
Huili Yang, Yanqin Du, Guangshe Zhang, Ling Han, Longgui Zhang, Riwei Xu   +5 more
doaj   +1 more source

High Temperature Composites From Renewable Resources: A Perspective on Current Technological Challenges for the Manufacturing of Non-Oil Based High Char Yield Matrices and Carbon Fibers

Frontiers in Materials, 2022
During last decades a plethora of high temperature materials have been developed to work as a Thermal Protection System (TPS). Carbon based materials such as graphite, which possesses low density, high heat capacity and high energy of vaporization, have ...
Maurizio Natali, Marco Rallini, Luigi Torre, Debora Puglia   +3 more
doaj   +1 more source

Multifunctional Benzoxazines Feature Low Polymerization Temperature and Diverse Polymer Structures

, 2016
3,4-dihydro-3-phenyl-2H-1,3-benzoxazines derived from phenol-, resorcinol-, and phloroglucinol give monomers with one, two, and three oxazine units at a single benzene ring, respectively.
Marc Soto, Matthias Hiller, Katharina Koschek, Hartmut Oschkinat   +3 more
core   +2 more sources

A Novel Synthesis of Enantiopure Octahydropyrrolo[3,4-b]pyrroles by Intramolecular [3 + 2] Dipolar Cycloaddition on Chiral Perhydro-1,3-benzoxazines

, 2016
Condensation of N-substituted glycines with chiral 3-allyl-2-formyl perhydro-1,3-benzoxazines forms an azomethine ylide that cyclizes to give octahydropyrrolo[3,4-b]pyrrole derivatives.
Javier Nieto (131402), Rafael Pedrosa (1748134), Celia Andrés (2520307), Laura de las Heras (1792828)   +3 more
core   +1 more source

Catalyst selection and optimization of curing process for benzoxazine binders

Учёные записки Казанского университета: Серия Естественные науки
The process of benzoxazine resin curing in the presence of various catalysts was investigated. The catalytic activities were compared to identify the catalyst that most effectively reduced the benzoxazine curing temperature.
V. S. Nikitin, L. M. Amirova, K. A. Andrianova, R. R. Amirov   +3 more
doaj   +1 more source