Viscoelasticity of Aluminum Neutralized Telechelic Poly(ethylene butylene) Ionomer

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  • Atiqur Rahman Syed
    Department of Molecular and Material Sciences, IGSES, Kyushu University
  • Nemoto Norio
    Department of Molecular and Material Sciences, IGSES, Kyushu University

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  • Viscoelasticity of Aluminium Neutralized Telechelic Poly(ethylene butylene) Ionomer

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The associative and mechanical properties of aluminium neutralized telechelic poly(ethylene butylene) ionomer, CTPEB-Al, in a nonpolar solvent of decalin were studied from very dilute solution up to the bulk with rheological methods and IR spectroscopy. Dilute solution viscometry revealed that CTPEB-Al molecules are associated in very dilute solution as their smallest associating structural unit made of three CTPEB chains and two aluminium tricarboxylate bonds [(COO−)3Al3+ : ATC bond]. These smallest associating units are further associated into larger aggregates with increasing polymer concentration C and form viscoelastic networks above C=7 wt%. The viscoelasticity and IR data reveal that in the low concentration range from 7 wt% to 12 wt%, CTPEB-Al chains are associated with each other in such a way that they form pretty long network strands with or without branches as dangling chains that act as elastically effective chains as a whole. In the networks with C ≥ 70 wt%, however, most of the ATC bonds and ion clusters act as effective crosslinking points so that almost 90% chains become elastically effective in the bulk state. <br>

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