Thermorheological complexity of a dynamically asymmetric miscible blend: the improving role of Na+-MMT nanoclay
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- Ghelichi, M., Qazvini, N.T., Jafari, S.H. et al. Macromol. Res. (2013) 21: 362. doi:10.1007/s13233-013-1018-5
The influence for the minor amount of sodium montmorillonite (Na+-MMT) nanoclay on the thermorheological complexity of a miscible blend of 20 wt% poly(ethylene oxide) (PEO) in poly(methyl methacrylate) (PMMA) is studied. The dispersion of Na+-MMT in the PEO/PMMA is assessed via X-ray diffraction. The empirical principle of time-temperature superposition is found to be partially restored in the case of blend nanocomposite, whereas it fails for the neat PEO/PMMA blend. The relaxation times of each component are determined from the oscillatory shear rheometry data in the form of a monomeric friction coefficient. The chain dynamics of components is coupled in the presence of hydrophilic nanoclay, which preferentially adsorbs PEO. The self-concentration model of Lodge and McLeish successfully describes the temperature dependence of the PMMA monomeric friction coefficient in both the neat and blend nanocomposite in regards to the temperature range studied.
Keywordsterminal dynamics thermorheological complexity nanoclay miscible blends
© The Polymer Society of Korea and Springer Sciene+Business Media Dordrecht 2013