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

A technology of block copolymer and epoxy resin, which is applied in the field of polymer composite materials, can solve the problems of high crosslinking density of cured products, insufficient toughness of EP cured products, and large internal stress.

CN109135195APending Publication Date: 2019-01-04SICHUAN UNIV
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Patent Information

Authority / Receiving Office
CN · China
Current Assignee / Owner
Publication Date
2019-01-04

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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.
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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...

Examples

Embodiment 1

[0037] Embodiment 1, preparation and performance detection of composite material of the present invention

[0038] One, the preparation of composite material of the present invention

[0039] 1. Experimental materials and reagents

[0040] Bisphenol A glycidyl ether epoxy resin E-51 (DGEBA), purchased from Jiangsu Wuxi Resin Factory;

[0041] 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), purchased from Changshan Bell Co., Ltd.;

[0042]Monohydroxyl-terminated polydimethylsiloxane (PDMS-OH) was provided by Shin-Etsu Chemical Co., Ltd., Japan. Adopt anhydrous toluene azeotropic distillation before use;

[0043] ε-caprolactone (ε-CL), purchased from Aladdin, 99%, treated with calcium hydride (CaH 2 ) after drying, distillation under reduced pressure;

[0044] Stannous octoate (Sn(Oct) 2 ), purchased from Aladdin.

[0045] 2. Synthesis of Diblock Copolymer PDMS-b-PCL

[0046]

[0047] Add the polydimethylsiloxane PDMS-OH and caprolactone monomer and 0.1%wt stannous ...