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• W2022705370 abstract "Abstract Temperature dependence of the elastic modulus E 1 of crystalline regions in the direction parallel to the chain axis has been measured by x-ray diffraction for various kinds of polyethylene (PE) with different microstructures. The E 1 value is 235 GPa for all kinds of PE at room temperature. However, in some cases, E 1 began to decrease at a certain temperature, in one case at 50°C and in one at 65°C. The lattice spacing for the (002) plane also decreased with increasing temperature. The thermal expansion coefficient αc changed discontinuously around the temperature range where E 1 began to decrease. This indicates that axial thermal molecular motion (i.e., incoherent thermal motion) is enhanced at high temperature. These phenomena could well be explained with the kinked-chain model where two gauche conformations are incorporated in the all-trans, fully extended conformation. The kinked chain deforms very easily through the change of internal rotation around the C—C bond, which has a small force constant. So it is considered that the decrement of E 1 at high temperature is due to the incorporation of a small amount of contracted portions in the chain molecules. On the other hand, in some cases, the E 1 value was constant at 235 GPa up to 110°C In these cases, αc did not change with increasing temperature. Consequently, whether the molecular motion which brings the decrement of E 1 occurs or not is the origin of the difference of the temperature dependence of E 1 of PE. The E 1 value of PE obtained at -155°C is as high as 254 GPa." @default.
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• W2022705370 date "1992-06-01" @default.
• W2022705370 modified "2023-10-09" @default.
• W2022705370 title "Temperature dependence of the elastic modulus of crystalline regions of polyethylene with different microstructures—explanation with the kinked-chain model" @default.
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• W2022705370 doi "https://doi.org/10.1080/00222349208215512" @default.
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