Investigation of microstructural changes in impacted polyurea coatings using small angle X-ray scattering (SAXS)
| Autor: | Jeffry J. Fedderly, Susan Bartyczak, Willis Mock, Gilbert F. Lee, Edward Balizer |
|---|---|
| Rok vydání: | 2011 |
| Předmět: |
chemistry.chemical_classification
Radiation Materials science Small-angle X-ray scattering Scattering Advanced Photon Source Polymer Strain hardening exponent Condensed Matter Physics chemistry.chemical_compound Crystallography chemistry General Materials Science Deformation (engineering) Composite material Instrumentation Necking Polyurea |
| Zdroj: | Powder Diffraction. 26:149-154 |
| ISSN: | 1945-7413 0885-7156 |
| DOI: | 10.1154/1.3590738 |
| Popis: | Three polyureas with decreasing soft segment molecular weights of 1000, 650, and a 250/1000 blend were molded onto circular steel plates and then impacted with a high speed (275 m/s) conical-shaped steel cylinder. The polyurea layer of the post mortem bilayers was characterized on a molecular level by small angle synchrotron X-ray scattering (SAXS) at the Advanced Photon Source at the Argonne National Laboratory. Analysis revealed that the hard domains of the polyureas with lower molecular weight soft segments reformed and oriented over a greater area of the coating, thus increasing the polymer strain hardening and resulting in visibly less out of plane bilayer deformation. This agrees with the hypothesis that polymer strain hardening is a mechanism that retards necking failure of the metal plate. |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|