Mechanical properties of linear low-density polyethylene (LLDPE)/clay nanocomposites: Estimation of aspect ratio and interfacial strength by composite models

Ali Durmus, Ahmet Kaşgöz, Christopher W. Macosko

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44 Scopus citations

Abstract

In this study, mechanical properties of the linear low-density polyethylene (LLDPE)/org-clay nanocomposites prepared by melt processing were investigated. Aspect ratio (Af) of the clay layers were estimated by using the Halpin-Tsai (H-T) micromechanical model based on the enhancement of the Young's modulus (E) with the clay loading (). Strength of interfacial interactions ( and B parameters) between the clay layers and polymer chains were also quantified by two indirect modeling approaches based on the improvement in tensile strength (or yield stress) of the nanocomposite samples. Interfacial strength parameters, and B, were found as about 5MPa and 17.3, respectively. The average value of Af was calculated as 35 by the H-T model. In the TEM study, it was observed that the nanocomposite samples showed mixed morphology that could be defined as some exfoliated layers, intercalated clay stacks, and two to three layered tactoids present together within the samples. An estimated Af value was also confirmed by the TEM study. On the other hand, it was also shown that the Af value is consistent with previously reported values calculated by the modeling of melt rheological data of samples obtained from dynamic oscillatory shear measurements.

Original languageEnglish (US)
Pages (from-to)608-619
Number of pages12
JournalJournal of Macromolecular Science, Part B: Physics
Volume47
Issue number3
DOIs
StatePublished - May 2008

Bibliographical note

Funding Information:
This study was supported by the Research Fund of Istanbul University (Project Number 225/29042004) and the authors appreciate Michail Dolgovskij and Lisa L. Lim for their kind help. The authors also thank to ExxonMobil, Crompton, and Southern Clay companies for supplying various materials used in this work.

Keywords

  • Aspect ratio
  • Interfacial strength
  • LLDPE/clay nanocomposites
  • Mechanical properties

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