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Time–temperature superposition is a well-established principle used in the constitutive description of viscoelastic polymers. To expand the description to moisture-induced plasticization effects, two epoxide-based molding compounds used in microelectronics packaging were characterized by dynamic mechanical analysis under varying temperature and moisture controlled environments in their glassy regime. Conditions of up to 85 °C and 85% relative humidity, relevant for industry-defined reliability standards, were applied. By relating the transient ambient conditions to the actual moisture concentration of the samples, temperature-, and moisture concentration-dependent relaxation functions were obtained. By applying a time–temperature–moisture concentration superposition, it is shown, that the materials' behavior can be described assuming a linear dependence of the relative free volume on both temperature and concentration. The two parameters can be super-positioned in the description of the shift of the relaxation time constant spectrum with negligible cross-correlation for the conditions of industrial interest.
|Number of pages||12|
|Journal||International Journal of Polymer Analysis and Characterization|
|Publication status||Published - 2020|
- time–temperature–moisture concentration superposition
ASJC Scopus subject areas
- Analytical Chemistry
- Chemical Engineering(all)
- Polymers and Plastics
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- 1 Active
CD-Laboratory for Fiber Swelling and Paper Performance
Hirn, U., Lahti, J. A., Schennach, E., Fischer, W. J., Czibula, C. M., Urstöger, G. J., Ganser, C., Schuller, M., Krainer, S., Xhori, R., Spirk, S. & Niegelhell, K.
1/12/15 → 30/11/23
Project: Research project