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Local viscoelasticity at resin-metal interface analyzed with spatial-decomposition formula for relaxation modulus
Hodaka Mori1, Nobuyuki Matubayasi2
1DENSO Corporation, 1-1, Showa-cho, Kariya, Aichi 448-8661, Japan.
The Journal of Chemical Physics
|September 23, 2019
Summary
A new spatial-decomposition formula analyzes local viscoelasticity by decomposing the relaxation modulus. Strong resin-metal adhesion creates a viscous layer, impacting stress-stress correlations at the interface.
Area of Science:
- Materials Science
- Polymer Physics
- Computational Chemistry
Background:
- Understanding interfacial viscoelasticity is crucial for material design.
- Existing models often struggle to capture complex behaviors at material interfaces.
Purpose of the Study:
- To introduce a spatial-decomposition formula for analyzing local viscoelasticity.
- To investigate the impact of adhesion strength on resin layer formation and dynamics at a resin-metal interface.
Main Methods:
- Developed a spatial-decomposition formula for the relaxation modulus.
- Applied the formula to the Kremer-Grest model at a resin-metal interface.
- Analyzed spatially decomposed stress-stress time correlation functions.
Main Results:
- Strong resin-metal interaction leads to a resin layer significantly larger than segment size.
- Interfacial effects are localized near the wall only with weak adhesion.
- The layer region exhibits higher viscosity (longer stress-stress correlation times) under strong adhesion.
Conclusions:
- The spatial-decomposition formula provides a general framework for interfacial viscoelasticity analysis.
- Adhesion strength dictates the relationship between stress-stress correlations and interfacial structure.
- The study reveals how segment-scale interactions influence local stress dynamics at interfaces.
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