Matrix morphology and the particle dispersion in HDPE nanocomposites with enhanced wear resistance

Jani Pelto (Corresponding Author), Tuukka Verho, Helena Ronkainen, Kimmo Kaunisto, Jarkko Metsäjoki, Jani Seitsonen, Mikko Karttunen

Research output: Contribution to journalArticleScientificpeer-review

Abstract

High density polyethylene nanocomposites were prepared by melt mixing of varying type of nanopowders in the presence of vinyltrimethoxysilane (VTMS) coupling agent. Three spherical/irregular-shaped nanopowders, fumed Al2O3 , γ-Al2O3 , cubic titanium nitride (TiN) (1.5 vol-%), and high aspect ratio graphene oxide platelets (GO) (0.5 vol-%) were investigated in a high molecular weight HDPE matrix. Significant differences in the dispersion quality between the nanopowders were found by TEM and AFM. Degree of crystallinity of the nanocomposites (DSC/XRD) was consistently lower than in the neat HDPE polymer. The particularly well dispersed fumed Al2O3 , γ-Al2O3 and GO nanopowders induced significant modification on the micromechanical properties of the HDPE. For the first time, great enhancement in the sliding wear performance, and an improvement in the abrasive wear performance was found in the high molecular weight HDPE nanocomposites. DSC analyses showed elevations in the glass transition temperatures and the peak melting temperatures of the nanocomposites. XRD peak splitting in the HDPE + GO and the HDPE + γ-Al2O3 nanocomposites suggest the emergence of a concurrent orthorhombic HDPE phase. Formation of new phases was also supported by DSC analyses showing broad and multimodal melting peaks. Scherrer analyses of XRD data showed slightly increased HDPE crystalline thicknesses in the range of 15–20 nm in the nanocomposites, which was in line with the TEM and AFM observations. The great elevation in the melting temperatures of the HDPE nanocomposites with fumed Al2O3 and γ-Al2O3 could not be attributed to the polymer lamellar thickness, but rather to the altered properties of the solid amorphous phase stemming for the nanopowder additives.

Original languageEnglish
Article number105897
JournalPolymer Testing
Volume77
DOIs
Publication statusE-pub ahead of print - 10 May 2019
MoE publication typeA1 Journal article-refereed

Fingerprint

Polyethylene
High density polyethylenes
Wear resistance
Nanocomposites
Graphite
Platelets
Oxides
Graphene
Melting point
Polymers
Molecular weight
Transmission electron microscopy
Titanium nitride
Coupling agents
Abrasion
Aspect ratio
Melting
Wear of materials
Crystalline materials

Keywords

  • High density polyethylene
  • Nanocomposite
  • Wear

Cite this

@article{ff70701960d04ceb90d04a32984a6113,
title = "Matrix morphology and the particle dispersion in HDPE nanocomposites with enhanced wear resistance",
abstract = "High density polyethylene nanocomposites were prepared by melt mixing of varying type of nanopowders in the presence of vinyltrimethoxysilane (VTMS) coupling agent. Three spherical/irregular-shaped nanopowders, fumed Al2O3 , γ-Al2O3 , cubic titanium nitride (TiN) (1.5 vol-{\%}), and high aspect ratio graphene oxide platelets (GO) (0.5 vol-{\%}) were investigated in a high molecular weight HDPE matrix. Significant differences in the dispersion quality between the nanopowders were found by TEM and AFM. Degree of crystallinity of the nanocomposites (DSC/XRD) was consistently lower than in the neat HDPE polymer. The particularly well dispersed fumed Al2O3 , γ-Al2O3 and GO nanopowders induced significant modification on the micromechanical properties of the HDPE. For the first time, great enhancement in the sliding wear performance, and an improvement in the abrasive wear performance was found in the high molecular weight HDPE nanocomposites. DSC analyses showed elevations in the glass transition temperatures and the peak melting temperatures of the nanocomposites. XRD peak splitting in the HDPE + GO and the HDPE + γ-Al2O3 nanocomposites suggest the emergence of a concurrent orthorhombic HDPE phase. Formation of new phases was also supported by DSC analyses showing broad and multimodal melting peaks. Scherrer analyses of XRD data showed slightly increased HDPE crystalline thicknesses in the range of 15–20 nm in the nanocomposites, which was in line with the TEM and AFM observations. The great elevation in the melting temperatures of the HDPE nanocomposites with fumed Al2O3 and γ-Al2O3 could not be attributed to the polymer lamellar thickness, but rather to the altered properties of the solid amorphous phase stemming for the nanopowder additives.",
keywords = "High density polyethylene, Nanocomposite, Wear",
author = "Jani Pelto and Tuukka Verho and Helena Ronkainen and Kimmo Kaunisto and Jarkko Mets{\"a}joki and Jani Seitsonen and Mikko Karttunen",
note = "Project 101938",
year = "2019",
month = "5",
day = "10",
doi = "10.1016/j.polymertesting.2019.105897",
language = "English",
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journal = "Polymer Testing",
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Matrix morphology and the particle dispersion in HDPE nanocomposites with enhanced wear resistance. / Pelto, Jani (Corresponding Author); Verho, Tuukka; Ronkainen, Helena; Kaunisto, Kimmo; Metsäjoki, Jarkko; Seitsonen, Jani; Karttunen, Mikko.

In: Polymer Testing, Vol. 77, 105897, 10.05.2019.

Research output: Contribution to journalArticleScientificpeer-review

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AU - Pelto, Jani

AU - Verho, Tuukka

AU - Ronkainen, Helena

AU - Kaunisto, Kimmo

AU - Metsäjoki, Jarkko

AU - Seitsonen, Jani

AU - Karttunen, Mikko

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N2 - High density polyethylene nanocomposites were prepared by melt mixing of varying type of nanopowders in the presence of vinyltrimethoxysilane (VTMS) coupling agent. Three spherical/irregular-shaped nanopowders, fumed Al2O3 , γ-Al2O3 , cubic titanium nitride (TiN) (1.5 vol-%), and high aspect ratio graphene oxide platelets (GO) (0.5 vol-%) were investigated in a high molecular weight HDPE matrix. Significant differences in the dispersion quality between the nanopowders were found by TEM and AFM. Degree of crystallinity of the nanocomposites (DSC/XRD) was consistently lower than in the neat HDPE polymer. The particularly well dispersed fumed Al2O3 , γ-Al2O3 and GO nanopowders induced significant modification on the micromechanical properties of the HDPE. For the first time, great enhancement in the sliding wear performance, and an improvement in the abrasive wear performance was found in the high molecular weight HDPE nanocomposites. DSC analyses showed elevations in the glass transition temperatures and the peak melting temperatures of the nanocomposites. XRD peak splitting in the HDPE + GO and the HDPE + γ-Al2O3 nanocomposites suggest the emergence of a concurrent orthorhombic HDPE phase. Formation of new phases was also supported by DSC analyses showing broad and multimodal melting peaks. Scherrer analyses of XRD data showed slightly increased HDPE crystalline thicknesses in the range of 15–20 nm in the nanocomposites, which was in line with the TEM and AFM observations. The great elevation in the melting temperatures of the HDPE nanocomposites with fumed Al2O3 and γ-Al2O3 could not be attributed to the polymer lamellar thickness, but rather to the altered properties of the solid amorphous phase stemming for the nanopowder additives.

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KW - Wear

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