Phthalonitrile-terminated polyaryletherketone resin and preparation method thereof

Abstract

The invention relates to a polyaryletherketone resin and a preparation method thereof, particularly a phthalonitrile-terminated polyaryletherketone resin and a preparation method thereof, belonging to the technical field of high-molecular materials. The invention provides a polyaryletherketone resin of which the structure is disclosed in the specification. In the structural formula of the phthalonitrile terminated polyaryletherketone resin, m+n=1, 0<m<1, and 0<n<1. The invention also provides a preparation method of the phthalonitrile-terminated polyaryletherketone resin. The method comprises the steps of (1) synthesis of hydroxyl-terminated polyaryletherketone and (2) synthesis of phthalonitrile-terminated polyaryletherketone. Bisphenol S is introduced to the main chain of the polyaryletherketones, and a crosslinking group bis-phthalonitrile is introduced to the chain end, thereby obtaining the crosslinking function on the premise of facilitating the processing due to the decrease of the melting point of the polyaryletherketones; and thus, the crosslinked polyaryletherketones can obtain the application temperature of a thermosetting engineering material by a thermoplastic engineering material processing technique, thereby opening up a new way for application of polyaryletherketones in the field of high temperature resistance.

Description

Technical field [0001] The invention relates to a polyaryletherketone resin and a preparation method thereof, in particular to a phthalonitrile-terminated polyaryletherketone resin and a preparation method thereof, and belongs to the technical field of polymer materials. Background technique [0002] As a new type of semi-crystalline aromatic special engineering plastic, polyaryl ether ketone has excellent high temperature resistance, corrosion resistance, radiation resistance, flame retardancy, high mechanical properties, excellent dimensional stability and excellent electrical properties. In many special fields, it can replace traditional materials such as metals and ceramics, and has made outstanding contributions in reducing quality and improving performance. It has become one of the most popular high-performance special engineering plastics today. [0003] Traditional polyaryl ether ketone is a kind of semi-crystalline linear polymer. Although it has good processing properties...

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Problems solved by technology

[0003] Traditional polyaryletherketone is a kind of semi-crystalline linear polymer, although it has good processability, it has a high melting point, so the energy consumption in its processing is relatively large

In addition, the glass transition temperature (Tg) of polyaryletherketone is not high enough, and the modulus drops significantly when it is applied above the glass transition temperature. At high temperatures, the fluidity has little dependence on temperature, resulting in a lower use temperature.

[0004] In order to further increase the use temperature of polyaryletherketone materials, people introduce a rigid structure into the polyaryletherketone main chain to increase the rigidity of polyaryletherketone to increase the glass transition temperature (T g ), and ultimately to increase the use temperature of the material, but the increase in the glass transition temperature will inevitably lead to a continuous increase in its melting point, which brings more and more difficulties to processing

[0005] The Chinese patent application with the application number 201510869420.8 discloses an industrial synthesis method of end-capping modified polyaryletherketone resin. The end-capping agent is 3,4'-difluorobenzophenone, 3-chloro-4-fluorodi A mixture of one or more of benzophenone, 3-fluoro-4-chlorobenzophenone and 3,4'-dichlorobenzophenone can maintain the melting point at a low level, but its vitrification The transition temperature is still low, resulting in a lower service temperature, and its mechanical strength is also low

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