Bestimmung der elastischen Konstanten von Polyäthylen
Bestimmung der elastischen Konstanten von Polyäthylen
This work reports the first direct determination of the microscopic elastic shear constants C$_{44}$ , C$_{55}$, C$_{66}$ and C' = $\frac{1}{4}$(C$_{11}$+C$_{22}$-2C$_{12}$ ) of crystalline polyethylene at room temperature. Fully deuterated and uniaxially oriented polycrystalline sampIes were u...
Saved in:
Personal Name(s): | Heyer, D. (Corresponding author) |
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Contributing Institute: |
Institut für Festkörperforschung; IFF |
Imprint: |
Jülich
Kernforschungsanlage Jülich, Zentralbibliothek, Verlag
1981
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Document Type: |
Report |
Series Title: |
Berichte der Kernforschungsanlage Jülich
1723 |
Link: |
OpenAccess |
Publikationsportal JuSER |
This work reports the first direct determination of the microscopic elastic shear constants C$_{44}$ , C$_{55}$, C$_{66}$ and C' = $\frac{1}{4}$(C$_{11}$+C$_{22}$-2C$_{12}$ ) of crystalline polyethylene at room temperature. Fully deuterated and uniaxially oriented polycrystalline sampIes were used. The constants were obtained from a comparison of inelastic neutron scattering intensity profiles at low energy transfer near Bragg reflections with calculations in the long wavelength limit. The results are C44 = 2.1 $\pm$ 0.3 GPa, C$_{55}$ = 2.2 $\pm$ 0.3 GPa, C$_{66}$ = 1.46 $\pm$ 0.25 GPa and C' = 0.87 $\pm$ 0.25 GPa. Earlier macroscopic data can be derived satisfactorily from the measured constants assuming homogeneous stress in the sample. |