Polymer composite material having oriented electrically and thermally conductive pathways

Patent metadata

Field	Value
Publication number	US-11345101-B2
Application number	US-202117362292-A
Country	US
Kind code	B2
Filing date	Jun 29, 2021
Priority date	Mar 24, 2020
Publication date	May 31, 2022
Grant date	May 31, 2022

Abstract

A method of forming a polyolefin-perovskite nanomaterial composite which contains oriented electrically and thermally conductive pathways. The method involves milling a polyolefin with particles of a perovskite nanomaterial, molding to forma composite plate, and subjecting the composite plate to an AC voltage. The AC voltage forms oriented electrically and thermally conductive pathways by partial dielectric breakdown of the composite. The presence of the oriented electrically and thermally conductive pathways gives the polyolefin-perovskite nanomaterial electrical and thermal conductivity and dielectric permittivity higher than the polyolefin alone.

First claim

The invention claimed is:

1. A polyolefin-perovskite nanomaterial composite, comprising:
a polyolefin matrix in an amount of 90 to 99 wt %, based on a total weight of the polyolefin-perovskite nanomaterial composite;
perovskite nanomaterial present in an amount of 1 to 10 wt %, based on a total weight of the polyolefin-perovskite nanomaterial composite; and
oriented electrically and thermally conductive pathways that are hollow channels and/or electrically damaged polyolefin matrix having a chemical composition different from the polyolefin matrix,
wherein the oriented electrically and thermally conductive pathways have a length of from 1 to 5 mm and a tapered shape with mean thickness of 0.05 to 2 μm.

2. The polyolefin-perovskite nanomaterial composite of claim 1 , wherein the polyolefin matrix comprises polyethylene.

3. The polyolefin-perovskite nanomaterial composite of claim 2 , wherein the polyethylene is low density polyethylene.

4. The polyolefin-perovskite nanomaterial composite of claim 3 , wherein the low density polyethylene has a density of 0.88 to 0.96 g/cm 3 and a melt flow index of 0.2 to 2.5 g/10 minutes.

5. The polyolefin-perovskite nanomaterial composite of claim 1 , wherein the perovskite nanomaterial is barium titanate nanoparticles.

6. The polyolefin-perovskite nanomaterial composite of claim 1 , wherein the oriented electrically and thermally conductive pathways comprise dendritic conductive channels in the polyolefin matrix which terminate at and originate from at least one selected from the group consisting of an exterior surface of the composite, a channel created by the needle electrode, and a particle of the perovskite nanomaterial.

7. The polyolefin-perovskite nanomaterial composite of claim 1 , wherein the polyolefin-perovskite nanomaterial composite has a thermal conductivity of 0.1 Wm −1 K −1 to 500 Wm −1 K −1 , an electrical conductivity of 10 −12 S/m to 10 2 S/m, and a dielectric permittivity of 3.1 to 50 at 1 kHz.

8. The polyolefin-perovskite nanomaterial composite of claim 1 , wherein the electrically and thermally conductive pathways originate at a point and propagate outward from the point as a cone-shaped dendritic structure.

Assignees

• Univ Prince Mohammad Bin Fahd

Inventors

• Zazoum Bouchaib

Classifications

• B29K2995/0006

  Dielectric · CPC title

• Y10S502/525

  Perovskite · CPC title

• B29K2995/0013

  Conductive · CPC title

• C08K2201/005

  Additives being defined by their particle size in general · CPC title

• C08L23/00

  Compositions of homopolymers or copolymers of unsaturated aliphatic hydrocarbons having only one carbon-to-carbon double bond; Compositions of derivatives of such polymers · CPC title