Optical characterisation of 6t and 4t single crystals by ellipsometry; anisotropy and crystalline structure (original) (raw)
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Morphology of polyethylene single crystals
Journal of Polymer Science Part A: General Papers, 1963
An electron microscope study of polyethylene single crystals is reported. The following points have been investigated: ( 1 ) influence of crystallization temperature on crystal shape; (2) effect of solvent etching on already formed crystals. Crystals were deposited from very dilute solutions at temperature ranging between 80 and 120'C. Solvents like xylene, butyl acetate, isoamyl acetate, and diphenyl ether were used. Besides the already reported true and truncated lozenges, hexagonal crystals have been obtained with tendency to regularity as the temperature of crystallization increases. The melting point of hexagonal crystals is somewhat lower than that of lozenges. Their structure, as revealed by electron diffraction, is orthorhombic, similar to that of lozenges. Diamond-shaped crystals etched with solvent under strictly controlled conditions display unexpected morphology. The peripheral region of the crystal of the sectors composing the crystals is characterized by a lower solubility and a lower density.
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