Nanocomposite formation in hydrogenated nitrile rubber (HNBR)/organo- montmorillonite as a function of the intercalant type

Konstantinos G. Gatos, Nikolaos S. Sawanis, Anton A. Apostolov, Ralf Thomann, József Karger-Kocsis

Research output: Contribution to journalArticle

119 Citations (Scopus)

Abstract

Hydrogenated acrylonitrile butadiene rubber (HNBR) was melt compounded with montmorillonite (MMT) and organophilic modified MMTs prior to sulfur curing. In contrast to the micro-composite formation resulting from the compounding of the HNBR and pristine MMT, the modified MMTs (i.e., octadecylamine: MMT-ODA, octadecyltrimethylamine: MMT-ODTMA, methyltallow-bis(2-hydroxyethyl) quaternary ammonium: MMT-MTH intercalants) produced nanocomposites. It was found that the organoclay with primary amine intercalant (cf. MMT-ODA) gave confined structures along with the exfoliated/intercalated structures. This was traced to its reactivity with the curatives. By contrast, the organoclays containing less reactive quaternary ammonium compounds (cf. MMT-ODTMA, MMT-MTH) were exfoliated and intercalated based on X-ray diffraction (XRD) and transmission electron microscopy (TEM) results. The hydroxyl functional groups of the MMT-MTH supported the clay dispersion. The better adhesion between MMT-MTH and HNBR was explained by hydrogen bonding between the hydroxyl groups of the intercalant and the acrylonitrile group of the HNBR matrix. This HNBR/MMT-MTH nanocomposite showed the best mechanical properties as verified by tensile mechanical tests and dynamic mechanical thermal analysis (DMTA). The high tensile strength along with the high elongation at break for the rubber nanocomposites were attributed to the ability of the 'clay network' to dissipate the input energy upon uniaxial loading.

Original languageEnglish
Pages (from-to)1079-1086
Number of pages8
JournalMacromolecular Materials and Engineering
Volume289
Issue number12
DOIs
Publication statusPublished - Dec 15 2004

Keywords

  • Hydrogenated nitrile rubber (HNBR)
  • Intercalation
  • Montmorillonite (MMT)
  • Nanocomposites
  • Organoclay
  • Rubber

ASJC Scopus subject areas

  • Chemical Engineering(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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