The mechanism of orientation of acridine in oriented polyethylene

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Abstract
Spectroscopic and thermal analytical techniques have been used to study the system polyethylene‐acridine at solute concentrations of up to a few percent. All data are consistent with the epitaxialgrowth of acridine microcrystals on the surfaces of the crystalline microfibrils of oriented polyethylene. Acridine microcrystals could not be detected in an unoriented polymer suggesting that the critical lattice match needed for epitaxialgrowth occurs only when the (110) planes of polyethylene are exposed due to slip during mechanical deformation. Polyethylene is known to crystallize epitaxially on crystals of anthracene and other fused ring compounds providing corroboration of the basic mechanism. It is suggested that specific adsorption related to the mechanism of epitaxialgrowth of microcrystals may be the major orienting mechanism for, at least, symmetrical fused ring compounds.

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