Application of block copolymers in the construction of specific nanostructures in epoxy resins and the preparation of high-toughness composites

Abstract

The invention provides the application of the block copolymer for the construction of specific nanostructures in epoxy resin and the preparation of high-toughness composite materials. The experimental results prove that, compared with pure epoxy resin, the toughness of the PDMS-PCL / EP composite material prepared by the present invention is significantly enhanced: when PDMS 1 -PCL 4 When the content is 40wt%, the fracture toughness of the thermoset with 10‑60nm worm-like nanostructures is about 255% higher than that of pure epoxy resins, while the spherical nanostructures only increase the fracture toughness of pure epoxy resins at the same addition amount up 42%. Compared with the PCL-b-PDMS-b-PCL / EP composite material, under the same addition amount, the toughness of the PDMS-PCL / EP composite material prepared by the present invention is obviously better than that of the PCL-b-PDMS-b-PCL / EP composite materials, the improvement rate reached 97%. This shows that the toughness of the PDMS-PCL / EP composite material prepared under the specific ratio of the present invention has significant advantages, and has achieved unexpected technical effects, which can be used as coatings, electrical materials, pouring packaging materials, adhesives, sealing materials, etc. The matrix material of glue is widely used in aerospace, automobile, shipbuilding, construction, railway transportation and other fields.

Description

technical field [0001] The invention belongs to the field of polymer composite materials, and specifically relates to the application of block copolymers in the construction of specific nanostructures in epoxy resins and the preparation of high-toughness composite materials. 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 resin...

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.

Images