Abstract
With fractionated linear polyethylene, single crystals were prepared isothermally from dilute solutions in various solvents asn-octane,n-hexadecane, decaline, tetralin, toluene,p-xylene and diphenyl ether, which differed in the size and the thermodynamic properties. The fold length of lamellae was plotted against the crystallization temperature. For tetralin,p-xylene and toluene systems, their observed points lay nearly on the same curve, but for other solvent systems, the relation was obviously not independent of the kind of solvent from which the single crystals were formed. To discuss the effect of solvent on single crystal formation from dilute solution, the end surface free energy of single crystal was estimated from the equation based on the kinetic theory. It was pointed out that more regularly folded single crystals may be formed with solvent having larger thermodynamic interaction parameter and larger molar volume.
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