Graphene/polymer nanocomposites containing surface modified graphene

Patent metadata

Field	Value
Publication number	US-9738775-B1
Application number	US-201715491202-A
Country	US
Kind code	B1
Filing date	Apr 19, 2017
Priority date	May 21, 2014
Publication date	Aug 22, 2017
Grant date	Aug 22, 2017

Abstract

A method for enhancing an interaction between graphene nanoparticles and a poly(styrene-co-methylmethacrylate), including modifying graphene with nitric acid to form graphene nanoparticles surface modified with one or more oxygen functionalities, melt blending the poly(styrene-co-methylmethacrylate) and the modified graphene nanoparticles to obtain a nanocomposite, and exposing the nanocomposite to microwave irradiation to form defects in the graphene nanoparticles. A blend composition, including graphene nanoparticles and a poly(styrene-co-methylmethacrylate), where the graphene nanoparticles are dispersed in the poly(styrene-co-methylmethacrylate), and the graphene nanoparticles are surface modified with oxygen functionalities.

First claim

The invention claimed is:

1. A blend composition, comprising:
graphene nanoparticles and a poly(styrene-co-methylmethacrylate),
wherein a content ratio (weight/weight) of styrene to methyl methacrylate in the poly(styrene-co-methylmethacrylate) is from 50-90/20-40,
wherein the graphene nanoparticles are dispersed in the poly(styrene-co-methylmethacrylate), and
wherein the graphene nanoparticles are thermally oxidized and/or microwaved irradiated and comprise one or more surface modifications selected from the group consisting of a carboxyl group, a carbonyl group, an epoxy group, and a hydroxyl group.

2. The blend composition of claim 1 , wherein the blend composition has an intensity level of the D band at 1357 cm −1 ranging from 2000 to 2200 and an intensity level of the G band at 1583 cm −1 of from 2050 to 2200.

3. The blend composition of claim 1 , wherein the storage modulus of the blend composition is from 1800 to 2200 MPa at 100° C. and from 1400 to 1800 MPa at 40° C.

4. The blend composition of claim 1 , wherein the glass transition temperature of the blend composition is from 92.0 to 106.0° C.

5. The blend composition of claim 1 , wherein the blend composition has a crystal lattice structure with layer to layer spacing of the modified graphene nanoparticles in the range of from 0.35 to 0.55 nm.

6. The blend composition of claim 1 , wherein a content of the graphene nanoparticles is from 0.05 to 0.125 wt % based on 100 wt % of the poly(styrene-co-methylmethacrylate).

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Al-Harthi Mamdouh Ahmed
• Zubair Mukarram

Classifications

• C01B32/194 Primary

  After-treatment · CPC title

• C08J3/28

  Treatment by wave energy or particle radiation · CPC title

• C08J2325/14

  with unsaturated esters · CPC title

• C08J5/005

  Reinforced macromolecular compounds with nanosized materials, e.g. nanoparticles, nanofibres, nanotubes, nanowires, nanorods or nanolayered materials · CPC title

• C08K3/042

  Graphene or derivatives, e.g. graphene oxides · CPC title