Effect of modified graphene and microwave irradiation on the mechanical and thermal properties of P(S-co-MMA)/graphene nanocomposites

Patent metadata

Field	Value
Publication number	US-9701819-B2
Application number	US-201615172612-A
Country	US
Kind code	B2
Filing date	Jun 3, 2016
Priority date	May 21, 2014
Publication date	Jul 11, 2017
Grant date	Jul 11, 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 polystyrene 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 the graphene nanoparticles are surface modified with oxygen functionalities.

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 the oxygen functionalities are selected from the group consisting of a carboxyl group, a carbonyl group, an epoxy group, and a hydroxyl group, on a defect site or a side wall of graphene.

7. 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).

8. The blend composition of claim 1 , wherein the poly(styrene-co-methylmethacrylate) and the graphene nanoparticles are bonded through a methacrylate portion of the poly(styrene-co-methylmethacrylate) to the graphene by addition across a C═C bond.

9. A blend composition, comprising graphene nanoparticles and a poly(styrene-co-methylmethacrylate),
wherein the graphene nanoparticles are dispersed in the poly(styrene-co-methylmethacrylate),
and the graphene nanoparticles are surface modified with oxygen functionalities, and
wherein a storage modulus of the blend composition is from 1800 to 2200 MPa at 100° C. and from 1400 to 1800 MPa at 40° C.

10. A blend composition, comprising graphene nanoparticles and a poly(styrene-co-methylmethacrylate),
wherein the graphene nanoparticles are dispersed in the poly(styrene-co-methylmethacrylate),
and the graphene nanoparticles are surface modified with oxygen functionalities, and
wherein a glass transition temperature of the blend composition is from 92.0 to 106.0° C.

11. A blend composition, comprising graphene nanoparticles and a poly(styrene-co-methylmethacrylate),
wherein the graphene nanoparticles are dispersed in the poly(styrene-co-methylmethacrylate),
and the graphene nanoparticles are surface modified on a defect site or a side wall of graphene with oxygen functionalities selected from the group consisting of a carboxyl group, a carbonyl group, an epoxy group, and a hydroxyl group.

Assignees

• Univ King Fahd Pet & Minerals

Inventors

• Al-Harthi Mamdouh Ahmed
• Zubair Mukarram

Classifications

• C08J3/28 Primary

  Treatment by wave energy or particle radiation · CPC title

• C08L25/14

  with unsaturated esters · CPC title

• C08K9/02 Primary

  Ingredients treated with inorganic substances · CPC title

• C08J2325/14

  with unsaturated esters · CPC title

• C08K3/04

  Carbon · CPC title