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Rheological and Morphological Characterization of Triblock Copolymer (PEO-PPO-PEO)-Clay Gel in Aqueous Solution

Published online by Cambridge University Press:  26 February 2011

Jun Jiang ,
Chunhua Li ,
Miriam Rafailovich  and
Jonathan Sokolov
Jun Jiang
Affiliation:
[email protected], State Universit of New York at Stony Brook, Materils Science and Engineering, Old Engineering, Room 314, Stony Brook, New York, 11790, United States, 6316328467
Chunhua Li
Affiliation:
[email protected]
Miriam Rafailovich
Affiliation:
[email protected]
Jonathan Sokolov
Affiliation:
[email protected]
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Abstract

Thermal gelation and structure properties of high concentration triblock copolymer poly (ethylene oxide)99-poly(propylene oxide)69-poly(ethylene oxide)99 (Pluronic F127)-clay aqueous solutions were characterized by rheological measurements and scanning electron microscopy (SEM). The sol-gel transition temperature, as well as the viscosity of the F127 solution was found to depend both on the concentration of polymer and clay filler. In all cases, Pluronic F127 gels are pseudoplastic, showing the shear-thinning behavior. Above the gel transition, the viscosity of the solutions increased with increasing the clay concentration. The corresponding macrostructure of the gels was studied by lyophilizing thick samples and scanning them with a scanning electron microscope (SEM). A well-ordered network of porosity was observed as a function of polymer concentration and orientation.

Keywords

polymerscanning electron microscopy (SEM)morphology
Type
Research Article
Information
MRS Online Proceedings Library (OPL) , Volume 898: Symposium L – Mechanical Behavior of Biological and Biomimetic Materials , 2005 , 0898-L05-11
Copyright
Copyright © Materials Research Society 2006

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