Carbon nanotube/polyetherimide/thermosetting resin dielectric composite and preparation method therefor

Patent metadata

Field	Value
Publication number	US-10053544-B2
Application number	US-201515534500-A
Country	US
Kind code	B2
Filing date	May 28, 2015
Priority date	Dec 29, 2014
Publication date	Aug 21, 2018
Grant date	Aug 21, 2018

Abstract

The invention discloses a carbon nanotube/polyetherimide/thermosetting resin dielectric composite and a preparation method therefor. 100 parts by weight of polyetherimide and 1-7 parts by weight of carbon nanotube are mixed uniformly in an Haake torque melt cavity to obtain a carbon nanotubes/polyetherimide composite; 20 parts of the carbon nanotube/polyetherimide composite are dissolved in 100-150 parts of dichloromethane, then the mixed solution is added in 100 parts of molten thermocurable thermosetting resin, mixing, and heat preserving, stirring are performed until a mixture is formed in a uniform state, and curing and post-treating are performed to obtain a carbon nanotube/thermosetting resin dielectric composite, wherein the substrate thereof has a typical reverse phase structure, while the carbon nanotubes are dispersed in a polyetherimide phase. The composite has a relatively low percolation threshold, a high dielectric constant and a low dielectric loss. The preparation method of the present invention has a simple process and is suitable for large-scale production.

First claim

What is claimed is:

1. A preparation method of a carbon nanotube/polyetherimide/thermosetting resin dielectric composite comprising following steps:
(1) mixing 100 parts by weight of polyetherimide and 1-7 parts by weight of carbon nanotube uniformly and adding into an Haake torque melt cavity, mixing in a Banbury mixer for 10-30 min under the temperature of 300-340° C. with the rotating speed of 50-150 r/min, to obtain a carbon nanotubes/polyetherimide composite;
(2) in a mass ratio, dissolving 20 parts of carbon nanotube/polyetherimide composite in 120-150 parts of methylene chloride, and mixing the resulting solution with 100 parts of molten thermosetting resin, heat preserving and stirring for 30-50 min, after curing to obtain a carbon nanotube/polyetherimide/thermosetting resin dielectric composite.

2. The preparation method of a carbon nanotube/polyetherimide/thermosetting resin dielectric composite according to claim 1 , wherein said carbon nanotube is one of single-walled carbon nanotube without surface treatment, multi-walled carbon nanotube without surface treatment, or their combination.

3. The preparation method of a carbon nanotube/polyetherimide/thermosetting resin dielectric composite according to claim 1 , wherein said thermosetting resin is a self-curing thermosetting resin, or a resin system composing of a resin that cannot be thermally cured by itself and curing agents.

4. The preparation method of a carbon nanotube/polyetherimide/thermosetting resin dielectric composite according to claim 3 , wherein said self-curing thermosetting resin is bismaleimide, cyanate ester, or their combination.

5. The preparation method of a carbon nanotube/polyetherimide/thermosetting resin dielectric composite according to claim 3 , wherein said resin that cannot be thermally cured by itself is epoxy resin.

6. A carbon nanotube/polyetherimide/thermosetting resin dielectric composite obtained by the preparation method according to claim 1 .

Assignees

• Univ Soochow

Inventors

• Liang Guozheng
• Jiao Yicheng
• Gu Aijuan
• Yuan Li

Classifications

• C08J3/201

  Pre-melted polymers · CPC title

• H01B3/303

  Macromolecular compounds obtained by reactions forming a linkage containing nitrogen with or without oxygen or carbon in the main chain of the macromolecule, not provided for in groups H01B3/38 or H01B3/302 · CPC title

• C08J2335/00

  Characterised by the use of homopolymers or copolymers of compounds having one or more unsaturated aliphatic radicals, each having only one carbon-to-carbon double bond, and at least one being terminated by a carboxyl radical, and containing at least one other carboxyl radical in the molecule, or of salts, anhydrides, esters, amides, imides or nitriles thereof; Derivatives of such polymers · CPC title

• C08J2479/08

  Polyimides; Polyester-imides; Polyamide-imides; Polyamide acids or similar polyimide precursors · CPC title

• C08J3/005 Primary

  Processes for mixing polymers · CPC title