Effective preparation of montmorillonite/polyurethane nanocomposites by introducing cationic groups into the polyurethane main chain

Eun Hwan Jeong, Jie Yang, Ji Hye Hong, Tae Gon Kim, Jung Hyun Kim, Ji Ho Youk

Research output: Contribution to journalArticle

21 Citations (Scopus)

Abstract

In this study, the effect of introducing a small amount of cationic groups into the polymer main chain on the exfoliation of montmorillonite (MMT) and the physical properties of the subsequent MMT/polymer nanocomposites were investigated. As a matrix polymer, a polyurethane cationomer (PUC) containing 3 mol% of quaternary ammonium groups was synthesized and MMT/PUC nanocomposites containing various amounts of MMT were prepared by the solution intercalation method. From the WAXS and TEM analyses, it was found that the MMT layers were completely exfoliated and dispersed in the PUC matrix. The Young's modulus of the MMT/PUC nanocomposites significantly increased with increasing MMT content, but their elongation at break and maximum stress were maintained at a level close to that of the PU only at an MMT content of 1 wt% and decreased as the content of MMT increased above this level. The phase separation of the MMT/PUC nanocomposites was retarded with increasing content of MMT, due to the strong interactions between the PUC chains and the exfoliated MMT layers. It was found that the presence of small amounts of cationic groups in the main chain of the matrix polymer was very effective in facilitating the preparation of the MMT/polymer nanocomposites.

Original languageEnglish
Pages (from-to)2286-2291
Number of pages6
JournalEuropean Polymer Journal
Volume43
Issue number6
DOIs
Publication statusPublished - 2007 Jun

All Science Journal Classification (ASJC) codes

  • Physics and Astronomy(all)
  • Organic Chemistry
  • Polymers and Plastics
  • Materials Chemistry

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