Phthalonitrile-terminated polyimide resin containing phthalazinone structure, cured product and preparation method thereof

Abstract

The invention belongs to the field of synthesis of polymer materials and specifically relates to phthalonitrile-terminated polyimide resin containing a phthalazinone structure, a cured product and a preparation method thereof. The phthalonitrile-terminated polyimide resin containing the phthalazinone structure is prepared by taking 4-(3-aminophenoxy) phthalonitrile as a terminating agent and carrying out solution nucleophilic substitution reaction. The method has simple steps and is convenient and feasible. The polyimide resin shows great solubility in commonly used polar solvents, can be processed and molded by a variety of ways, and simultaneously has great curing reaction activity. The cured product of the polyimide resin containing the phthalazinone structure with dimension stability and high thermal stability can be obtained by carrying out pre-curing on the resin at the temperature of 150-300 DEG C and carrying out thermal treatment at the temperature of 350-400 DEG C in the presence of aromatic diamine. The phthalonitrile-terminated polyimide resin containing the phthalazinone structure can be used for preparing coatings, insulating paint, sizing agents, thin films, high-performance composite materials and the like and has wide application prospects.

Description

technical field [0001] The invention belongs to the field of polymer material synthesis, and in particular relates to a phthalonitrile-terminated polyimide resin containing a phthalazinone biphenyl structure, a cured product and a preparation method thereof. Background technique [0002] Polyimide (PI) is an important class of thermoplastic polymer materials with high glass transition temperature (Tg), excellent thermal stability, good electrical properties, excellent mechanical properties and toughness, flame retardancy And high radiation resistance, can be made into different forms of products such as film, powder, varnish, fiber, etc. and other high-tech fields. However, most of the polyimide varieties that have been commercialized have a fully aromatic rigid structure, so their solubility and processability are poor, which limits their processing and application. [0003] Introducing flexible groups and larger side groups into the main molecular chain of polyimide can ...

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Problems solved by technology

[0005] Although the cured products of the reported phthalonitrile derivatives have excellent heat resistance, the solubility of the phthalonitrile-terminated polymers before curing is poor, and the curing initiation temperature is generally too high. High (usually above 250°C), cross-linking may be accompanied by degradation and narrow processing window; in addition, phthalonitrile derivatives are usually solidified in their molten state, so there is excessive energy consumption in processing and molding Large, the processing cost is also increased, and the application is limited

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