β Scribed by N.B. Valiotti; S.A. Nenakhov; G.E. Zaikov
No coin nor oath required. For personal study only.
Al~tract--Heat-induced changes in the linear dimensions of oriented high density polyethylene samples were studied. It has been shown that, strained under certain conditions, polyethylene (PE) samples may undergo thermal expansion prior to shrinkage in the initial stages of heating. Subsequent heating results in polymer shrinkage, which goes down to the equilibrium linear dimensions corresponding to those of an isotropic non-strained sample at a given temperature. The stage of shrinkage is followed by an expansion, the sample linear dimensions being governed by the coefficient of linear thermal expansion of the initial isotropic PE.
π SIMILAR VOLUMES
The functional properties of a ferromagnetic shape memory alloy, which undergoes martensitic transformation of a cubic-tetragonal type, have been analyzed using the Landau theory of phase transitions. A key role of the temperature dependency of the crystal lattice parameters in the formation of the