Mechanism of aging effects on viscoelasticity in ethylene-methacrylic acid ionomer studied by local thermal-mechanical analysis

A unique atomic force microscope-based local thermal-mechanical analysis (LTA) technique was used to study the influence of room temperature aging on viscoelastic properties of ethylene-methacrylic (E/MAA) acid ionomers. This approach permits easy access to structural relaxation effects on viscoelas...

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Bibliographic Details
Published in:Journal of materials research 2009-03, Vol.24 (3), p.1087-1092
Main Authors: Kulkarni, Harsha P., Mogilevsky, Gregory, Mullins, William M., Wu, Yue
Format: Article
Language:English
Subjects:
Applied and Technical Physics
Biomaterials
Inorganic Chemistry
Materials Engineering
Materials Science
Nanoindentation
Nanotechnology
Thermal conductivity
Viscoelasticity
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Summary:A unique atomic force microscope-based local thermal-mechanical analysis (LTA) technique was used to study the influence of room temperature aging on viscoelastic properties of ethylene-methacrylic (E/MAA) acid ionomers. This approach permits easy access to structural relaxation effects on viscoelasticity at a short aging time, for instance, before the occurrence of secondary crystallization differential scanning calorimetry (DSC) melting peak. A Burger model along with finite element method yields quantitative analysis of viscoelastic properties versus the aging time. Creep curves were obtained with LTA after various times of aging at room temperature upon cooling from the melt. Measurements were carried out at both 30 and 70 °C. The results reveal the effects of structural relaxation upon aging in the ion-rich amorphous region, the influence of secondary crystallites on the viscoelastic properties, and shed light on the processes associated with aging in E/MAA ionomers.
ISSN:0884-2914
2044-5326
DOI:10.1557/jmr.2009.0083