Title of article :
Crystallization and unusual rheological behavior in poly(ethylene oxide)–clay nanocomposites
Author/Authors :
Kelarakis، نويسنده , , Antonios and Giannelis، نويسنده , , Emmanuel P.، نويسنده ,
Issue Information :
دوهفته نامه با شماره پیاپی سال 2011
Pages :
7
From page :
2221
To page :
2227
Abstract :
We report a systematic study of the crystallization and rheological behavior of poly(ethylene oxide) (PEO)–clay nanocomposites. To that end a series of nanocomposites based on PEOs of different molecular weight (103 < MW < 105 g/mol) and clay surface modifier was synthesized and characterized. Incorporation of organoclays with polar (MMT-OH) or aromatic groups (MMT-Ar) suppresses the crystallization of polymer chains in low MW PEO, but does not significantly affect the crystallization of high MW matrices. In addition, the relative complex viscosity of the nanocomposites based on low MW PEO increases significantly, but the effect is less pronounced at higher MWs. The viscosity increases in the series MMT-Alk < MMT-OH < MMT-Ar. In contrast to the neat PEO which exhibits a monotonic decrease of viscosity with temperature, all nanocomposites show an increase after a certain temperature. This is the first report of such dramatic enhancements in the viscoelasticity of nanocomposites, which are reversible, are based on a simple polymer matrix and are true in a wide temperature range.
Keywords :
Poly(ethylene oxide) , nanocomposites , Organoclays
Journal title :
Polymer
Serial Year :
2011
Journal title :
Polymer
Record number :
1737405
Link To Document :
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