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

A technology of block copolymer and epoxy resin, which is applied in the direction of epoxy resin coating, epoxy resin glue, adhesive type, etc., can solve the problem of poor impact resistance and peeling resistance, difficult sliding between molecular chains, and EP curing Insufficient physical toughness and other problems

Active Publication Date: 2022-03-04
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

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.

Method used

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

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Experimental program
Comparison scheme
Effect test

Embodiment 1

[0036] Embodiment 1, preparation and performance detection of composite material of the present invention

[0037] One, the preparation of composite material of the present invention

[0038] 1. Experimental materials and reagents

[0039] Bisphenol A glycidyl ether epoxy resin E-51 (DGEBA), purchased from Jiangsu Wuxi Resin Factory;

[0040] 3,3'-dichloro-4,4'-diaminodiphenylmethane (MOCA), purchased from Changshan Bell Co., Ltd.;

[0041] Monohydroxyl-terminated polydimethylsiloxane (PDMS-OH) was provided by Shin-Etsu Chemical Co., Ltd., Japan. Adopt anhydrous toluene azeotropic distillation before use;

[0042] ε-caprolactone (ε-CL), purchased from Aladdin, 99%, treated with calcium hydride (CaH 2 ) after drying, distillation under reduced pressure;

[0043] Stannous octoate (Sn(Oct) 2 ), purchased from Aladdin.

[0044] 2. Synthesis of Diblock Copolymer PDMS-b-PCL

[0045]

[0046] Add the polydimethylsiloxane PDMS-OH and caprolactone monomer and 0.1%wt stannous o...

Embodiment 2

[0090] The PDMS-PCL / EP composite material prepared in Example 1 is used as the matrix resin, and the commonly used modifiers in the fields of coatings, electrical materials, casting packaging materials, adhesives, sealants, etc. are prepared to prepare coatings, electrical materials, Pouring packaging materials, adhesives, sealants.

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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...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08L63/00C08L83/10C09D163/00C09D183/10C09J163/00C09J183/10
CPCC09D163/00C09J163/00C08L63/00C08L83/10
Inventor 邹华维陈洋衡正光李霂萱张浩若梁梅
Owner SICHUAN UNIV
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