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Preparation method and application of a high-strength and high-toughness thermosetting resin-based composite material

A composite material and epoxy resin technology, which is applied in the preparation and application of high-strength and high-toughness thermosetting resin-based composite materials, can solve problems such as insignificant effects, and achieve improved toughness and dynamic rigidity, strong dynamic rigidity, and good application prospects. Effect

Active Publication Date: 2019-07-26
SICHUAN UNIV
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

While toughening the epoxy resin, the tensile strength of the composite material is improved, but the effect is not obvious, and further improvement is needed

Method used

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  • Preparation method and application of a high-strength and high-toughness thermosetting resin-based composite material
  • Preparation method and application of a high-strength and high-toughness thermosetting resin-based composite material
  • Preparation method and application of a high-strength and high-toughness thermosetting resin-based composite material

Examples

Experimental program
Comparison scheme
Effect test

Embodiment 1

[0037] Embodiment 1, the preparation of high molecular weight block copolymer PS-PCL-PDMS-PCL-PS (SLDLS-L1)

[0038] 1. Preparation method

[0039] The synthesis process of high molecular weight block copolymer SLDLS is as follows:

[0040]

[0041] 1. Preparation of PCL-b-PDMS-b-PCL

[0042] The molecular weight of HTPDMS is 3123, the molecular weight of caprolactone is 114, the molecular weight of 2-bromoisobutyryl bromide is 229.91, and the molecular weight of styrene is 104.

[0043] Take 4.234g of hydroxyl-terminated polydimethylsiloxane (HTPDMS, m=42) and dry toluene in a 250ml anhydrous and oxygen-free bottle to remove water by azeotropy, distill off excess toluene, and then add 16g of caprolactone (ε-CL) and stannous octoate [Sn(Oct) 2 ] (the addition amount is 1wt‰ε-CL) was added to the above-mentioned purified HTPDMS. After three cycles of liquid nitrogen freezing-vacuum degassing-thawing, the flask under negative pressure was placed in a constant-temperature ...

Embodiment 2

[0054] Embodiment 2, the preparation (SLDLS-L2) of high molecular weight block copolymer PS-PCL-PDMS-PCL-PS

[0055] 1. Preparation method

[0056] The synthesis process of the high molecular weight block copolymer SLDLS is the same as in Example 1.

[0057] The molecular weight of HTPDMS is 3123, the molecular weight of caprolactone is 114, the molecular weight of 2-bromoisobutyryl bromide is 229.91, and the molecular weight of styrene is 104.

[0058] 1. Preparation of PCL-b-PDMS-b-PCL

[0059] Get 4.234g of hydroxyl-terminated polydimethylsiloxane (HTPDMS, m=42) and a certain amount of dry toluene in a 250ml anhydrous oxygen-free bottle to remove water by azeotropy, distill off excess toluene, and then 26.96g of caprolactone (ε -CL) and stannous octoate [Sn(Oct) 2 ] (the addition amount is 1wt‰ε-CL) was added to the above-mentioned purified HTPDMS. After three cycles of liquid nitrogen freezing-vacuum degassing-thawing, the flask under negative pressure was placed in a ...

Embodiment 3

[0069] Embodiment 3, the preparation of epoxy resin-based composite material

[0070] According to the proportion shown in table 1, the block copolymer PS-b-PCL-b-PDMS-b-PCL-b-PS (SLDLS-L1) prepared by embodiment 1 is added in the epoxy prepolymer (DGEBA) , Stir vigorously at 120°C until a uniform and transparent solution is formed, then add the curing agent MOCA into the system, stir rapidly and vigorously until a uniform and transparent solution is obtained. Put the obtained blended solution in a vacuum oven at 120°C for 1 hour to remove air bubbles in the system, then pour it into a polytetrafluoroethylene mold, cure at 150°C for 2 hours, then raise the temperature to 180°C for 2 hours, after the curing reaction is completed, demould to obtain Epoxy thermosetting resin containing block copolymers.

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Abstract

The invention provides a high molecular weight block copolymer PS-b-PCL-b-PDMS-b-PCL-b-PS and a method for modifying epoxy resin thereof, the block copolymer PS-b-PCL- b-PDMS-b-PCL-b-PS has the structure shown in Formula I: When epoxy resins are modified with the block copolymer PS‑b‑PCL‑b‑PDMS‑b‑PCL‑b‑PS, the tensile strength of the epoxy resins is significantly increased, while the toughness and dynamic stiffness are also increased .

Description

technical field [0001] The invention relates to a preparation method and application of a high molecular weight block copolymer PS-PCL-PDMS-PCL-PS modified epoxy resin. Background technique [0002] Epoxy resin, as an important class of thermosetting resin, is widely used in various fields due to its excellent performance. However, the inherent brittleness and poor damping properties brought about by high cross-linking degree limit its application in high-performance composite materials. In recent years, block copolymers have attracted much attention because they can form different shapes in selective solvents, and there have been studies on modified epoxy resins, but there are few reports on the design of block copolymers and their application in epoxy resins. The study of morphologies in matrices to obtain desired properties. [0003] The core-shell structure is a more classic method of toughening epoxy resins. The traditional core-shell structure is to control the size...

Claims

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Application Information

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Patent Type & Authority Patents(China)
IPC IPC(8): C08F293/00C08F212/08C08G77/445C08G63/91C08G63/695C08L63/00C08L53/00
CPCC08F212/08C08F293/00C08G63/6952C08G63/912C08G77/445C08L63/00
Inventor 邹华维陈洋衡正光梁梅
Owner SICHUAN UNIV