Abstract
This study examined the effect of draw ratio on the properties of high density polyethylene (m-HDPE) prepared using a metallocene catalyst as mooring rope material for 20,000-30,000 ton ships (small and medium class ships). The density, crystallinity, crystallite size, crystalline orientation, melting enthalpy, and tensile modulus increased with increasing draw ratio from 8 to 14; however, the elongation at break decreased. The tensile strength of the m-HDPE filament increased significantly with increasing draw ratio up to 12 and then decreased a little. The reduction in tensile strength for the filament with draw ratio of 14 might be due to stress whitening. The various properties of the m-HDPE mono-filament with draw ratio of 14 prepared in this study (tensile strength: 8.0 g/d, elongation at break: 10.0%, tensile modulus: 104.5 g/d, water absorption: 0.19%, color fastness to sea water (grade): 4-5, chemical resistance: 82-94%) were found to pass the mooring rope material criteria for 20,000-30,000 ton ships (tensile strength: > 8 g/d, elongation at break: 10% <, tensile modulus: > 100 g/d, water absorption: 0.7% <, color fastness to sea water (grade): > 4, chemical resistance: > 80%).
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