Ultimate mechanical properties of polyethylene fibers were measured. Results are in close agreement with the stress-induced melting theory of fracture (for finite molecular weight polymers). The perfect fiber work of rupture Wc, modulus Kc, strength s c, and strain 1 c are found to be Wc 0.084 ^ 0.003 GPa; s c 7.5 GPa; Kc 335 ^ 12 GPa; 1 c 0.0225 ^ 0.0005. The activation energy of fracture is measured as < 108 kJ/mol—the activation energy of polyethylene fusion and one-third the activation energy of bond scission. Nonuniformity of fibers necessitates averaging properties over several test lengths. Actual stress-strain curves are decomposed into thermodynamic and irreversible components. Fusion theory applies to the thermodynamic component..
Посилання на статтю:
The breaking strength of ultra-high molecular weight polyethylene fibers / K.J. Smith Jr., J. Wang // Polymer. – 1999. – N 40. – P. 7261–7274.