Method for preparing high-toughness composite resin through self-nanostructure building of block copolymer in epoxy matrix

Abstract

The invention provides a method for preparing high-toughness composite resin through the self-nanostructure building of block copolymer in an epoxy matrix. Experiments show that compared with pure epoxy resin, the PDMS-PCL / EP composite material prepared by the method has evidently enhanced toughness; when PDMS1-PCL4 content is 40wt%, the fracture toughness of the thermosetting material with 10-60nm wormlike nanostructures is increased by about 255% as compared with that of the pure epoxy resin, and the fracture toughness of the thermosetting material added with the same quantity of spherical nanostructures is only increased by 42% as compared with that of the pure epoxy resin; compared with a PCL-b-PDMS-b-PCL-EP composite material, under the same adding quantity, the toughness of the PDMS-PCL / EP composite material prepared by the method is evidently better than that of the PCL-b-PDMS-b-PCL-EP composite material, and the toughness is increased by 97%. The toughness of the PDMS-PCL / EP composite material prepared by the method according to a specific proportion has evident advantages, an unexpected technological effect is obtained, and the application range of the epoxy resin is expanded.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and in particular relates to a method for preparing a high-toughness composite resin by spontaneously constructing a nanostructure of a block copolymer in an epoxy matrix. Background technique [0002] Epoxy resin (EP) is an excellent high-strength thermosetting resin and is a widely used matrix material. EP molecules have two or more epoxy groups, which can be cross-linked and cured with amines, acid anhydrides, and polyamides to form a highly cross-linked three-dimensional network structure, and the cured product has wear resistance Good, excellent heat resistance, good chemical stability, excellent electrical insulation, high strength, low shrinkage, easy processing and molding, chemical resistance, good adhesion to substrates and low price, etc., as an electronic coating , coatings, electrical materials, casting packaging materials, adhesives, and sealant matrix resins are widely u...

AI Technical Summary

Problems solved by technology

However, the cured product formed after EP curing has a high crosslinking density, a three-dimensional network structure in space, difficult sliding between molecular chains, and large internal stress, resulting in hard and brittle cured products, easy cracking, poor impact resistance and peeling resistance. It is difficult to meet the use requirements in the application, so that its application is limited to a certain extent. These shortcomings are caused by the insufficient toughness of EP cured products.

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