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Preparation method of polyethersulfone type hyper branched epoxy resin and application in toughening of linear epoxy resin

A technology of epoxy resin and polyethersulfone, which is applied in the implementation field of toughened linear epoxy resin, can solve the problems of single structure, lower thermal performance, and cumbersome synthesis steps, etc.

Active Publication Date: 2015-01-28
BEIJING UNIV OF CHEM TECH
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

Also when the addition amount is 5%, the tensile strength of the cured product increases by 19%, and the impact toughness increases by 84%. At the same time, the glass transition temperature does not decrease, but its thermal properties decrease.
There are many reports and patents on the use of hyperbranched polymers to toughen epoxy in the literature, but the synthesis steps are often cumbersome and the structure is single. More importantly, they sacrifice other properties of the material, such as glass transition temperature and tensile strength, while improving toughness. Tensile strength, etc.

Method used

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  • Preparation method of polyethersulfone type hyper branched epoxy resin and application in toughening of linear epoxy resin
  • Preparation method of polyethersulfone type hyper branched epoxy resin and application in toughening of linear epoxy resin
  • Preparation method of polyethersulfone type hyper branched epoxy resin and application in toughening of linear epoxy resin

Examples

Experimental program
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Effect test

Embodiment example 1

[0030] 22.88g (0.09mol) 4,4'-difluorodiphenyl sulfone, 35.04g (0.12mol) triphenolyl methane, 49.68g catalyst potassium carbonate, and solvent N-methylpyrrolidone (583ml) were added together to a machine equipped with Stir, thermometer, spherical reflux condenser, water separator and nitrogen protection device in a 1000ml four-neck flask, set the target temperature to 180°C, and react at the target temperature for 6h when the system starts to reflux. After the reaction, the reaction solution was poured into a mixed solution (0.1 mol / L) of 2500 ml of water and hydrochloric acid, and the crude product was obtained by suction filtration. The crude product was precipitated three times with a mixed solution of 2000ml alcohol and water (the volume ratio of alcohol and water was 2:1), and dried to obtain the product. The NMR spectrum of the polymer is shown in image 3 .

Embodiment example 2

[0032] In this embodiment, in the preparation process of polyethersulfone type hyperbranched polymer, the raw material 35.04g (0.12mol) of triphenolyl methane is replaced by 15.13g (0.12mol) of phloroglucinol, and the others are the same as those in Example 1. The product can be obtained. The NMR spectrum of the polymer is shown in Figure 4 .

Embodiment example 3

[0034] In this embodiment, in the preparation process of the polyethersulfone type hyperbranched polymer, the raw material 35.04g (0.12mol) of trisphenol methane is replaced by 16.10g (0.12mol) of trimethylolpropane, and the other is the same as that of Embodiment 1. available products. The NMR spectrum of the polymer is shown in Figure 5 .

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Abstract

The invention relates to a preparation method of polyethersulfone type hyper branched epoxy resin and application in toughening of linear epoxy resin. A polyethersulfone type hyper branched polymer is prepared by one-step method, the hyper branched polymer is prepared from disulfone, triol and trihydric phenol as raw materials by reaction between different end groups, and the polyethersulfone type hyper branched epoxy resin is prepared by end group epoxidation. A linear epoxy resin toughened modified material involved in the invention is prepared by using bisphenol A type linear epoxy resin as a base material, the polyethersulfone type hyper branched epoxy resin as a super toughening agent and adding a curing agent. The dosage of the polyethersulfone type hyper branched epoxy resin is 3%-30% of the epoxy resin weight. The impact strength of the epoxy modified material is increased by 89.9% compared with that of a pure bisphenol A type epoxy material, the elongation at break is increased by 73.9%, the tensile strength is increased by 19.6%, and the glass transition temperature is increased by 13.7%.

Description

technical field [0001] The invention relates to a preparation method of polyethersulfone type hyperbranched epoxy resin and an implementation method for toughening linear epoxy resin. Background technique [0002] The unique structure of epoxy resin gives it excellent properties. Strong cohesion and dense molecular structure make epoxy resin have excellent mechanical properties. In addition, epoxy resin also has the advantages of small curing shrinkage, good processing performance, good stability, and good heat resistance. Among thermosetting resins, epoxy cured products have the most excellent comprehensive properties and are also the most used type. However, there are still some shortcomings in the cured epoxy material, such as brittleness, poor impact resistance, poor heat resistance, etc. (LEE, H.; Neville, K., Handbook of Epoxy Resins.Mcgraw-Hill: New York, 1967 ). [0003] Existing methods for toughening and modifying epoxy resins generally include three categories...

Claims

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Application Information

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IPC IPC(8): C08G83/00C08G65/34C08G65/40C08G65/48C08G59/32C08L63/00
Inventor 李效玉苗雪佩孟焱刘湍
Owner BEIJING UNIV OF CHEM TECH
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