Promoting effect of methyne/methylene moiety of bisphenol E/F on phthalonitrile resin curing: Expanding the structural design route of phthalonitrile resin

Catalytic Polymerization of Phthalonitrile Resins by Carborane with Enhanced Thermal Oxidation Resistance: Experimental and Molecular Simulation

“…This solubility improvement may result from the introduction of the QCB cage, in which the strong steric hindrance would destroy the chain regularity of BPh and further decrease the interactions between pendant cyanides on neighboring chains. Thus, more solvent molecules were supposed to diffuse among BPh-Q prepolymers and interacted with them [ 35 ].…”

“…Moreover, the hydroxyl groups and the active hydrogen atoms on B-H were transferred to N-, thereby triggering a continuous nucleophilic reaction and forming triazine ring structures by the intermolecular polymerization of cyanides. Subsequently, the isoindoline structures were produced by linear growth of the triazine ring structures, followed by the final formation of phthalocyanine rings via the intramolecular polymerization [ 6 , 35 , 48 ]. Except for hydroxy groups, B-H bonds in QCB also provided active hydrogen atoms [ 47 ].…”

Synthesis and properties of a novel autocatalytic phthalonitrile monomer and its copolymerization with multi‐functional fluorene‐based benzoxazine monomers

“…This kind of structural design can effectively avoid the disadvantages caused by small molecules and low heat resistance resins, accelerate the cyano group polymerization, and reduce the polymerization temperature. 6,13 Meanwhile, because of the existence of flexible aryl ether moiety, the flexibility of the main chain was increased, which reduced the melting point of the OPD monomer without sacrificing other properties. 17,27 This is because the flexible chain segment has a greater degree of conformational freedom, which is conducive to the further cyano group cross-linking reaction.…”

“…[1][2][3][4] However, the traditional PN polymers also have many shortcomings in processing, such as narrow processing window and high processing equipment requirements, which limits their application in various industries. 5,6 It is therefore necessary to take measures to redesign the chemical structure of the molecule to improve the properties of polymers. 7,8 The traditional PN monomers can form high crosslinking network structure products under the action of curing crosslinker, and the thermal properties of the curing products are far better than that of traditional epoxy and bismaleimide polymers.…”

Novel self-promoted phthalonitrile monomer with siloxane segments: synthesis, curing kinetics, and thermal properties

“…However, aromatic amines are organic compounds that have many shortcomings, such as a lower melting point and they are easy to decompose or volatilize under high-temperature conditions. 11–13 In the 1980s, Keller and Griffth 14 synthesized a PN monomer containing the fluorine element, and their as-produced thermosets showed a remarkable improvement in heat resistance, and thermal and thermal oxidation stabilities. As is well known, the polyimide having an imide structure in the main chain is a high heat-resistant polymer thermoset.…”