TY  - RPRT
AU  - Heyer, D.
TI  - Bestimmung der elastischen Konstanten von Polyäthylen
VL  - 1723
IS  - Juel-1723
CY  - Jülich
PB  - Kernforschungsanlage Jülich, Zentralbibliothek, Verlag
M1  - PreJuSER-136333
M1  - Juel-1723
T2  - Berichte der Kernforschungsanlage Jülich
PY  - 1981
N1  - Record converted from JUWEL: 18.07.2013
AB  - 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.
LB  - PUB:(DE-HGF)29
UR  - https://juser.fz-juelich.de/record/136333
ER  -