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Graphene modified polyimide-based composite and preparation method thereof

A polyimide-based, graphene modification technology, applied in the field of polymer blending modification, can solve the problems of poor processing stability, poor mechanical properties, low dielectric constant, etc., and achieves improved mechanical properties. Effects of properties and dielectric constant, good compatibility, good electrical conductivity and mechanical properties

Active Publication Date: 2013-02-06
NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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  • Summary
  • Abstract
  • Description
  • Claims
  • Application Information

AI Technical Summary

Problems solved by technology

However, the existing polyimide materials have defects and deficiencies such as low dielectric constant, poor processing and molding stability, and poor mechanical properties.

Method used

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Examples

Experimental program
Comparison scheme
Effect test

Embodiment 9

[0025] Components are the same as in Example 1, and the preparation method is the same as in Example 1 except for the following content. The particle diameter of the graphene powder that step (1) adopts is 50nm; Step (2) stirring speed is 1500r / min, obtains the prepolymer-polyamic acid (PAA) of polyimide; Continue reaction 10h; Step (3 ) After stepwise heating, keep warm at each temperature point for 5 hours.

Embodiment 10

[0027] Components are the same as in Example 1, and the preparation method is the same as in Example 1 except for the following content. The particle diameter of the graphene powder that step (1) adopts is 100nm; Step (2) stirring speed is 800r / min, obtains the prepolymer of polyimide-polyamic acid (PAA); Continue reaction 5h; Step (3 ) After stepwise heating, keep warm at each temperature point for 2h.

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PUM

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Abstract

The invention discloses a graphene modified polyimide-based composite which is characterized in that the graphene modified polyimide-based composite comprises the following components in parts by weight: 95-105 parts of 4,4'-diaminodiphenyl ether, 110-120 parts of pyromellitic dianhydride and 1-25 parts of graphene. A preparation method comprises the steps of weighing ODA (octyl decyl adipate) and the graphene in proportion, measuring a DMAC (dimethylacetamide) solvent, adding the ODA, the graphene and the DMAC solvent to a reaction vessel, using ultrasonic till the ODA is dissolved sufficiently and the graphene is dispersed completely in the DMAC to obtain a graphene suspension, adding PMDA (pyromellitic dianhydride) in batches under high-speed stirring conditions till weak pole climbing appears, continuing to stir to allow diamine to react with dianhydride completely, and flattening an obtained graphene / PAA (poly acrylic acid) complex to obtain a composite film with uniform thickness so as to obtain a graphene polyimide composite film. The composite is 0.5 g / cm<3>-1.5 g / cm<3> in density and 60-170 KJ / m<2> in tensile strength.

Description

technical field [0001] The invention belongs to the field of high polymer blending modification, and in particular relates to a graphene-modified polyimide-based composite material and a preparation method thereof. Background technique [0002] Polymer-based dielectric composites with high dielectric constant are widely used in the field of microelectronics, and improving their dielectric constant is of great significance to the development of the electronics industry. According to the percolation theory, when conductive fillers are added to the polymer matrix, the dielectric constant of the composite material will increase suddenly when the filling amount of the filler is close to the percolation closure value of the material. Graphene has extremely high electrical conductivity and very stable chemical properties. As a single substance, it can transfer electrons faster than known conductors at room temperature. 10-6 Ω·cm, lower than copper or silver, is an ideal filler to ...

Claims

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Application Information

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IPC IPC(8): C08G73/10C08K9/00C08K3/04C08J5/18C08L79/08
Inventor 姚正军郑文建周金堂魏东博周畅姚芮陈永鑫
Owner NANJING UNIV OF AERONAUTICS & ASTRONAUTICS
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