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The effects of surface hydroxyl groups in polyethylene-silica nanocomposites

The effects of surface hydroxyl groups in polyethylene-silica nanocomposites
The effects of surface hydroxyl groups in polyethylene-silica nanocomposites
Logically, the surface chemistry of filler particles must be a key factor that governs how they interact with a polymer matrix, determining for example, how strongly the particles are bound into the matrix and how easy or difficult it is to achieve a homogenous dispersion of filler particles. This second point is surely one of the most basic challenges when producing a nanocomposite (poor dispersion is frequently stated as the cause of undesirable results). Many attempts have been made to modify the surface chemistry of filler particles through surface functionalization. Typically, this is achieved by chemically attaching polymer chains to the surface of the filler particles. In this paper we try a more direct approach; the surface chemistry of silica nanoparticles is modified by processing them at high temperature. This procedure removes hydroxyl groups from the surface of the filler particles, leaving siloxane groups which are stable at room temperature. Polyethylene composites were produced using both “as delivered” and high temperature processed nanosilica. After heat treatment the particles become hydrophobic which reduces the propensity for water uptake in the resulting nanocomposite and significantly modifies the dielectric response of the material.
polyethylene, nano, silica, hydroxyl, dielectric
978-1-4799-7354-5
201-204
Praeger, M.
84575f28-4530-4f89-9355-9c5b6acc6cac
Hosier, I.L.
6a44329e-b742-44de-afa7-073f80a78e26
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Swingler, S.G.
4f13fbb2-7d2e-480a-8687-acea6a4ed735
Praeger, M.
84575f28-4530-4f89-9355-9c5b6acc6cac
Hosier, I.L.
6a44329e-b742-44de-afa7-073f80a78e26
Vaughan, A.S.
6d813b66-17f9-4864-9763-25a6d659d8a3
Swingler, S.G.
4f13fbb2-7d2e-480a-8687-acea6a4ed735

Praeger, M., Hosier, I.L., Vaughan, A.S. and Swingler, S.G. (2015) The effects of surface hydroxyl groups in polyethylene-silica nanocomposites. 2015 IEEE Electrical Insulation Conference (EIC), United States. 07 - 10 Jun 2015. pp. 201-204 .

Record type: Conference or Workshop Item (Paper)

Abstract

Logically, the surface chemistry of filler particles must be a key factor that governs how they interact with a polymer matrix, determining for example, how strongly the particles are bound into the matrix and how easy or difficult it is to achieve a homogenous dispersion of filler particles. This second point is surely one of the most basic challenges when producing a nanocomposite (poor dispersion is frequently stated as the cause of undesirable results). Many attempts have been made to modify the surface chemistry of filler particles through surface functionalization. Typically, this is achieved by chemically attaching polymer chains to the surface of the filler particles. In this paper we try a more direct approach; the surface chemistry of silica nanoparticles is modified by processing them at high temperature. This procedure removes hydroxyl groups from the surface of the filler particles, leaving siloxane groups which are stable at room temperature. Polyethylene composites were produced using both “as delivered” and high temperature processed nanosilica. After heat treatment the particles become hydrophobic which reduces the propensity for water uptake in the resulting nanocomposite and significantly modifies the dielectric response of the material.

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Published date: 7 June 2015
Venue - Dates: 2015 IEEE Electrical Insulation Conference (EIC), United States, 2015-06-07 - 2015-06-10
Keywords: polyethylene, nano, silica, hydroxyl, dielectric
Organisations: EEE

Identifiers

Local EPrints ID: 378064
URI: http://eprints.soton.ac.uk/id/eprint/378064
ISBN: 978-1-4799-7354-5
PURE UUID: 7f094630-5fff-4882-bbfa-49306859e86a
ORCID for I.L. Hosier: ORCID iD orcid.org/0000-0003-4365-9385
ORCID for A.S. Vaughan: ORCID iD orcid.org/0000-0002-0535-513X

Catalogue record

Date deposited: 15 Jun 2015 14:57
Last modified: 17 Dec 2019 01:52

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Contributors

Author: M. Praeger
Author: I.L. Hosier ORCID iD
Author: A.S. Vaughan ORCID iD
Author: S.G. Swingler

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