Epoxy blocking modified graphene oxide and epoxy nanocomposite prepared from same

A technology based on epoxy and graphene, which is applied in the treatment of dyed low-molecular organic compounds, fibrous fillers, etc., can solve the problems of insufficient mechanical properties of composite materials, insufficient bonding strength of compatibility interfaces, etc., and improve energy storage Modulus and glass transition temperature, significant improvement, excellent application prospects

Active Publication Date: 2019-06-21
SICHUAN UNIV
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Problems solved by technology

[0005] However, the currently prepared graphene oxide/resin matrix composites, due to the lack of compatibility and interfacial bon

Method used

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Examples

Experimental program
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Effect test

Example Embodiment

[0045] Example 1. Preparation of epoxy-terminated modified graphene oxide of the present invention

[0046] according to figure 1 The synthetic route shown is to synthesize the epoxy-terminated modified graphene oxide (DHG-GO) of the present invention.

[0047] 1. Preparation of intermediate product 1 (D-GO)

[0048] Weigh 0.4g graphene oxide (GO, C / O molar ratio (6.9~7.1): 3, can be purchased from Beijing Carbon Century Technology Co., Ltd.) cell crushing and ultrasonic dispersion in 400mL dry dimethylformamide (DMF) , Add the dispersed GO suspension to a 1000mL three-necked flask, add p-hydroxyphenethylamine (DPE), dimethylepoxypyridine (DMAP) and N,N-dicyclohexylcarbodiimide in sequence (DCC), and ensure that m(GO):n(DPE):n(DMAP):n(DCC) is 0.4g:12mmol:4mmol:4mmol. The mixed solution was reacted at 90°C for 24 hours. After the reaction was completed, it was cooled to room temperature, and then filtered under reduced pressure with a 0.45 μm polytetrafluoroethylene filter membrane.

Example Embodiment

[0053] Example 2. Preparation of epoxy-terminated modified graphene oxide / epoxy nanocomposite (DHG-GO / EP) of the present invention

[0054] According to the formula shown in Table 1, weigh the modified graphene oxide DHG-GO, ultrasonically disperse it in the acetone solution at a ratio of 1:1mg / mL, and add 70g TDE-85 epoxy resin to the uniformly dispersed solution after ultrasonic (Hubei Xinrunde Chemical Co., Ltd.), mechanically stirred at 65°C for 14h to remove the solvent. Put the obtained modified graphene oxide / TDE-85 epoxy resin mixture into a vacuum oven and vacuum dry at 65°C until no bubbles are generated in the mixture to remove residual solvent. Weigh 4,4'-diaminodiphenylmethane (DDM) and 3,5-diethyl-2,4-toluenediamine (DETDA) mixed curing agent and melt, add modified graphene oxide / TDE-85 epoxy In the resin mixture, stir and mix uniformly at a constant speed to fully mix the curing agent and the resin. Put the resulting mixture in a vacuum drying box to remov

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Abstract

The invention provides epoxy blocking modified graphene oxide. Epoxy blocking modified graphene oxide is prepared by replacing an -OH group on a surface carboxyl group of graphene oxide with a group Aand replacing a hydrogen atom on a surface hydroxyl group of graphene oxide with a group B. Prepared epoxy blocking modified graphene oxide has the advantages that under low-dose addition, storage modulus and glass-transition temperature of an epoxy nanocomposite can be increased substantially, mechanical properties are improved remarkably, especially toughness (tensile strength) is improved remarkably unexpectedly, and the application prospects are good.

Description

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Claims

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Application Information

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Owner SICHUAN UNIV
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