Wrinkles in Polytetrafluoroethylene on Polystyrene: Persistence Lengths and the Effect of Nanoinclusions
| Autor: | Jeffrey T. Paci, Craig T. Chapman, Won Kyu Lee, George C. Schatz, Teri W. Odom |
|---|---|
| Rok vydání: | 2017 |
| Předmět: |
Persistence length
chemistry.chemical_classification Polytetrafluoroethylene Materials science 02 engineering and technology Polymer 010402 general chemistry 021001 nanoscience & nanotechnology 01 natural sciences Skin thickness Finite element method 0104 chemical sciences chemistry.chemical_compound Wavelength chemistry medicine General Materials Science Polystyrene Composite material medicine.symptom 0210 nano-technology Wrinkle |
| Zdroj: | ACS Applied Materials & Interfaces. 9:9079-9088 |
| ISSN: | 1944-8252 1944-8244 |
| DOI: | 10.1021/acsami.6b14789 |
| Popis: | We characterize wrinkling on the surfaces of prestrained polystyrene sheets coated with thin polytetrafluoroethylene skins using a combination of mechanical strain measurements and 3D finite element simulations. The simulations show that wrinkle wavelength increases with skin thickness, in agreement with a well-known continuum model and recent experiments. The wrinkle amplitudes also increase with strain. Nanoinclusions, such as holes and patterned lines, influence wrinkle patterns over limited distances, and these distances are shown to scale with the wrinkle wavelengths. Good agreement between experimental and simulated influence distances is observed. The inclusions provide strain relief, and they behave as if they are attracting adjacent material when the sheets are under strain. The wrinkles have stiffnesses in much the same way as do polymers (but at different length scales), a property that is quantified for polymers using persistence lengths. We show that the concept of persistence length can be useful in characterizing the wrinkle properties that we have observed. However, the calculated persistence lengths do not vary systematically with thickness and strain, as interactions between neighboring wrinkles produce confinement that is analogous to the kinetic confinement of polymers. |
| Databáze: | OpenAIRE |
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