Interfacial interactions in layered silicate polymer nanocomposites

Zita Dominkovics, J. Móczó, B. Pukánszky

Research output: Chapter in Book/Report/Conference proceedingChapter

3 Citations (Scopus)

Abstract

The homogeneous distribution of individual silicate layers in a polymer matrix by delamination or exfoliation is supposed to create enormous interfaces. As a consequence interfacial interactions and interphase formation must play a significant role in the determination of the structure and properties of layered silicate polymer nanocomposites. Much controversy surrounds interaction, structure and properties in these materials, which are discussed in detail in the chapter. Layered silicate nanocomposites are heterogeneous polymer systems and their properties are determined by component properties, composition, structure and interfacial interactions. The structure of nanocomposites is more complicated than usually assumed, exfoliation is practically never complete. Besides individual platelets and tactoids nanocomposites may contain also large silicate particles and a silicate network may develop at large extent of exfoliation. The assumed enormous interface usually does not form and properties are often determined by the amount and size of large particles. The surface coverage of organophilic silicates is usually close to 100 %, gallery structure, coverage, the available free silicate surface and interactions play an important role in exfoliation. The gallery structure of organophilic silicate depends on the chemical structure and amount of the surfactant used for treatment and on the ion exchange capacity of the clay. The surface free energy of organophilic silicate is small which leads to weak interaction with the polymer. Not miscibility, but adsorption determines polymer/silicate interaction. Layered silicate nanocomposites may consist of numerous components (silicate, surfactant, polymer, coupling agent, solvents and other compounds), which enter into various competitive interactions with each other; the dominating one determines final structure and properties. Practically no or only controversial information is available aboutinterphase formation and properties, but several facts and phenomena indicate the development of a soft interphase. The composition dependence of modulus does not supply much information about interactions or interphase properties. Yield stress and strength depend more strongly on interfacial adhesion, but the complicated and insufficiently characterized structure makes it practically impossible to relate interactions to properties. Evaluation of the composition dependence of the yield stress and strength of a large number of nanocomposites by a simple model indicate low level of exfoliation and weak interfacial adhesion between organophilic silicates and polymers.

Original languageEnglish
Title of host publicationPolymer Nanocomposite Research Advances
PublisherNova Science Publishers, Inc.
Pages5-47
Number of pages43
ISBN (Print)9781604560633
Publication statusPublished - 2008

Fingerprint

Silicates
Nanocomposites
Polymers
Yield stress
Surface-Active Agents
Surface active agents
Adhesion
Chemical analysis
Coupling agents
Platelets
Polymer matrix
Delamination
Free energy
Ion exchange

ASJC Scopus subject areas

  • Materials Science(all)

Cite this

Dominkovics, Z., Móczó, J., & Pukánszky, B. (2008). Interfacial interactions in layered silicate polymer nanocomposites. In Polymer Nanocomposite Research Advances (pp. 5-47). Nova Science Publishers, Inc..

Interfacial interactions in layered silicate polymer nanocomposites. / Dominkovics, Zita; Móczó, J.; Pukánszky, B.

Polymer Nanocomposite Research Advances. Nova Science Publishers, Inc., 2008. p. 5-47.

Research output: Chapter in Book/Report/Conference proceedingChapter

Dominkovics, Z, Móczó, J & Pukánszky, B 2008, Interfacial interactions in layered silicate polymer nanocomposites. in Polymer Nanocomposite Research Advances. Nova Science Publishers, Inc., pp. 5-47.
Dominkovics Z, Móczó J, Pukánszky B. Interfacial interactions in layered silicate polymer nanocomposites. In Polymer Nanocomposite Research Advances. Nova Science Publishers, Inc. 2008. p. 5-47
Dominkovics, Zita ; Móczó, J. ; Pukánszky, B. / Interfacial interactions in layered silicate polymer nanocomposites. Polymer Nanocomposite Research Advances. Nova Science Publishers, Inc., 2008. pp. 5-47
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