Swelling, compression and tribological behaviors of bentonite-modified polyacrylate-type hydrogels

S. Korres, L. Sorochynska, S. Grishchuk, J. Karger-Kocsis

Research output: Contribution to journalArticle

6 Citations (Scopus)

Abstract

Hydrogel was synthesized from acrylamide and 2-acryloylamido-2- methylpropanesulfonic acid monomers (ratio: 50/50 wt %) and crosslinked with 0.25 wt % of methylene-bisacrylamide. This hydrogel was also modified by adding 4 wt % of sodium bentonite (NB). Selected properties of the hydrogels with and without NB were investigated and compared. Their water uptake was measured gravimetrically; the compression and compression creep were assessed by dynamic-mechanical and thermo-mechanical analysis (DMA and TMA, respectively) techniques. The friction and wear of the hydrogels were determined in a shaft(metal)-on-plate(hydrogel) type testing configuration under water lubrication. The hydrogel was transparent and exhibited very high equilibrium water content (>99 wt %). The latter was less affected; however, the hydrogel became slightly more hazy after NB incorporation. The crosslink density of the hydrogels was deduced from swelling and compression tests and compared with the theoretical values. Modification by NB enhanced the ultimate compression strength and reduced the related compression strain. The compression creep response under both loading and deloading strongly depended on the level of the initial load. A very low friction coefficient (∼ 0.003) and a relatively high specific wear rate (∼ 0.05 mm3/N m) were registered under water lubricated sliding wear using a metallic counterpart with high surface roughness. Scanning electron microscopy combined with energy dispersive spectroscopy delivered additional information on the NB dispersion and surface structure of the hydrogels.

Original languageEnglish
Pages (from-to)1122-1134
Number of pages13
JournalJournal of Applied Polymer Science
Volume119
Issue number2
DOIs
Publication statusPublished - Jan 15 2011

Fingerprint

Bentonite
Hydrogels
Hydrogel
Polyacrylates
Swelling
Wear of materials
Water
Creep
Friction
Acrylamide
Dynamic mechanical analysis
Surface structure
Water content
Lubrication
Energy dispersive spectroscopy
Compaction
Monomers
Surface roughness
Metals
Sodium

Keywords

  • bentonite
  • compression behavior
  • friction
  • hydrogel
  • mechanical properties
  • nanocomposite
  • network
  • structure-property relationships
  • swelling

ASJC Scopus subject areas

  • Materials Chemistry
  • Polymers and Plastics
  • Surfaces, Coatings and Films
  • Chemistry(all)

Cite this

Swelling, compression and tribological behaviors of bentonite-modified polyacrylate-type hydrogels. / Korres, S.; Sorochynska, L.; Grishchuk, S.; Karger-Kocsis, J.

In: Journal of Applied Polymer Science, Vol. 119, No. 2, 15.01.2011, p. 1122-1134.

Research output: Contribution to journalArticle

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