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Abstract
The failure of polypropylene (PP) sutures was studied via creep rupture tests. Linear relationships were generated from plots of log time to break ( t B ) versus stress (σ). At a constant σ the results showed that t b was inversely proportional to the suture diameter (7-0,6-0,5-0 and 4-0) and to the radiation dose (0,15, 20, 25 and 50 Mrad). Moreover, for the 6-0 suture size at a 15 Mrad dose, ( t B ) decreased with increasing temperature (26, 37, 44, 50 and 60°C). For this creep rupture process the activation energy equalled 91.2 kJ/mol (21.8 kcal/mol). A mechanism for failure was presented which assumes that these sutures are bundles of oriented, semicrystalline microfibrils.
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