Exfoliated graphene/P(S-CO-MMA) nanocomposite

Patent metadata

Field	Value
Publication number	US-10059818-B1
Application number	US-201815967729-A
Country	US
Kind code	B1
Filing date	May 1, 2018
Priority date	Jun 2, 2014
Publication date	Aug 28, 2018
Grant date	Aug 28, 2018

Abstract

A method for forming a blend including graphene nanoparticles and a poly(styrene-co-methylmethacrylate), where the method includes melt mixing the poly(styrene-co-methylmethacrylate) and the graphene nanoparticles to obtain a nanocomposite and exposing the nanocomposite to microwave irradiation to bond the methyl methacrylate copolymer to the graphene nanoparticles, in which a content of the graphene nanoparticles is from 0.05 to 2 wt % based on the nanocomposites. A blend composition, including graphene nanoparticles and a poly(styrene-co-methylmethacrylate), where the graphene nanoparticles are dispersed in the poly(styrene-co-methylmethacrylate), the graphene nanoparticles are modified with microwave induced defects, and the free radicals of poly(styrene-co-methylmethacrylate) is bonded to the graphene nanoparticles at the defects.

First claim

The invention claimed is:

1. A method for forming a surface-modified nanocomposite, wherein the surface-modified nanocomposite comprises surface modified graphene nanoparticles that is at least 80% exfoliated and a poly(styrene-co-methylmethacrylate), comprising:
melt blending the poly(styrene-co-methylmethacrylate) and the surface modified graphene nanoparticles for a time period of from 5 to 20 min to obtain a first nanocomposite; and
exposing, in cycles of from 40 to 80 seconds for less than 10 minutes, the first nanocomposite to microwave irradiation to covalently bond the poly(styrene-co-methylmethacrylate) to the surface modified graphene nanoparticles and form the surface-modified nanocomposite,
wherein a content of the surface modified graphene nanoparticles in the surface-modified nanocomposite is from 0.05 to 2 wt % based on a total weight of the surface-modified nanocomposite.

2. The method of claim 1 , wherein the first nanocomposite is exposed to the microwave irradiation for 2 to 9 minutes.

3. The method of claim 1 , wherein the first nanocomposite is exposed to the microwave irradiation for 3 to 7 minutes.

4. The method of claim 1 , wherein the first nanocomposite is exposed to the microwave irradiation for about 5 minutes.

5. The method of claim 1 , wherein the content of the surface modified graphene nanoparticles is from 0.1 to 1.5 wt % based on the total weight of the surface modified nanocomposite.

6. The method of claim 1 , wherein the content of the surface modified graphene nanoparticles is about 1 wt % based on the total weight of the surface modified nanocomposite.

7. The method of claim 1 , wherein the surface-modified nanocomposite has a storage modulus of from 800 to 1300 MPA at 120° C. and from 1400 to 1800 MPA at 40° C.

8. The method of claim 1 , wherein the surface-modified nanocomposite has an electrical conductivity of from 1×10 −3 to 2.0×10 −3 S/cm.

9. The method of claim 1 , wherein the surface modified graphene nanoparticles are completely exfoliated in the poly(styrene-co-methylmethacrylate) after the first nanocomposite is exposed to the microwave irradiation.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Al-Harthi Mamdouh Ahmed
• Zubair Mukarram

Classifications

• B29K2025/06

  PS, i.e. polystyrene · CPC title

• C08J3/20 Primary

  Compounding polymers with additives, e.g. colouring · CPC title

• B29K2033/12

  Polymers of methacrylic acid esters, e.g. PMMA, i.e. polymethylmethacrylate · CPC title

• C08K2201/011

  Nanostructured additives · CPC title

• C08K3/04

  Carbon · CPC title