PURPOSE: To provide a polyethylene filament having specific molecular weight, N/C atomic ratio, tensile strength, initial modulus, dynamic visco-elastic characteristics and small angle X-ray scattering characteristics, useful as a light-weight reinforcing material for polar polymeric matrix material and exhibiting high adhesive strength.
CONSTITUTION: The objective polyethylene filament has a weight-average molecular weight of ≥1,000,000; ratio of the number of oxygen atom to nitrogen atom of 0.03W0.15 on the filament surface (determined by ESCA); a single filament tensile strength of ≥40g/d; a single filament initial modulus of ≥1,200g/d; the height of γ-dispersion peak of tanδ of ≤0.017 and a dynamic viscoelastic modulus E' of ≥600g/d (at 100°C) determined by dynamic viscoelastic measurement; and is free from long-period structure by small-angle X-ray scattering. The filament can be produced by drawing a filament produced by a spinning method characterized by the coagulation after gelation and passing through a low- temperature plasma generated in vapor of ammonia or a nitrogen-containing organic compound having low boiling point.
MITSUYOSHI TAKEHIKO
OKAMOTO HIDEHIRO
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