| Autor: |
Hammer, Alexander, Roland, Wolfgang, Leimhofer, Claudia, Hild, Sabine, Steinbichler, Georg |
| Předmět: |
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| Zdroj: |
AIP Conference Proceedings; 2023, Vol. 2607 Issue 1, p1-6, 6p |
| Abstrakt: |
Numerous plastic products are manufactured using processing techniques that enable the combination of different polymeric materials within multilayer structures (e.g., co-extrusion, co-injection molding, and extrusion lamination) to obtain tailored properties. Providing sufficient adhesion between the individual layers is of major importance. For a wide range of polymeric material combinations, interdiffusion of the macromolecules is the mechanism that mainly determines adhesion. Understanding the interdiffusion process and predicting concentration profiles and thus the resulting interphase thickness under given processing conditions (e.g., contact time, interfacial temperature) contributes to efficient manufacturing processes yielding multilayer plastic products that are optimized for sophisticated applications. In this work, we investigated the formation of an interdiffusion layer (interphase) between two polymer melts under static conditions by analyzing the concentration profiles developing across the interphase and the resulting mutual interpenetration depth. The interdiffusion process is modeled based on Fick's diffusion theory using concentration-dependent interdiffusion coefficients. The compatibility between different polymer melt is considered by applying the interaction theory according to Flory and Huggins. Further, all independent influencing parameters that govern the interdiffusion process are identified by transforming the diffusion equation into dimensionless representation. By varying these characteristic dimensionless parameters within particular ranges and numerically solving the partial differential equations, we analyzed their influence on the formation of the interphase and the final interdiffusion layer thickness. [ABSTRACT FROM AUTHOR] |
| Databáze: |
Complementary Index |
| Externí odkaz: |
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