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000136333 005__ 20200610184511.0
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000136333 041__ $$aGerman
000136333 082__ $$a500
000136333 0881_ $$aJuel-1723
000136333 088__ $$2JUEL$$aJuel-1723
000136333 1001_ $$aHeyer, D.$$b0$$eCorresponding author$$ufzj
000136333 245__ $$aBestimmung der elastischen Konstanten von Polyäthylen
000136333 260__ $$aJülich$$bKernforschungsanlage Jülich, Zentralbibliothek, Verlag$$c1981
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000136333 4900_ $$aBerichte der Kernforschungsanlage Jülich$$v1723
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000136333 520__ $$aThis 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.
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