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Molecular dynamics of copolyester/clay nanocomposites as investigated by viscoelastic and dielectric analysis

Authors

  • Rajendra A. Kalgaonkar,

    1. Polymer Science and Engineering Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
    Current affiliation:
    1. Halliburton Technology Center, Sai Radhe, Suite 400, 100-101 Kennedy Road, Pune 411001, India
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  • Jyoti P. Jog

    Corresponding author
    1. Polymer Science and Engineering Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
    • Polymer Science and Engineering Division, National Chemical Laboratory, Dr. Homi Bhabha Road, Pashan, Pune 411008, India
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Abstract

We have investigated the molecular dynamics of poly(ethylene glycol-co-cycloxeane-1,4-dimethanol terephthalate) (PETG) nanocomposites based on a organically modified layered silicate. Intercalated nanocomposites were prepared by melt compounding technique as evidenced from the X-ray diffraction and transmission electron microscopy studies. Two relaxation processes were observed in pure PETG as well as in the nanocomposites. The low-temperature β-process was assigned to the local motions of C[DOUBLE BOND]O polar groups and the α-process was due to the glass-rubber transition or the segmental relaxations associated with the polymer chain backbone. Presence of layered silicates accelerated α-relaxation dynamics in the nanocomposites accompanied by a depression in Tg which was attributed to the reduced intermolecular cooperativity between intercalated polymers chains. Additionally, a direct comparison between the viscoelastic and dielectric studies shows excellent agreement between the accelerated α dynamics of the nanocomposites. © 2008 Wiley Periodicals, Inc. J Polym Sci Part B: Polym Phys 46: 2539–2555, 2008

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