Document Type : Original Article
Authors
1 Esfarayen University of Technology, Esfarayen, North Khorasan, Iran
2 Biomaterials Group, Nanotechnology and Advanced Materials Department, Materials and Energy Research Center, Tehran, Iran
3 Orthopedic Research Center, Mashhad University of Medical Science, Mashhad, Iran.
Abstract
Background: To study the creep behavior for a series of biodegradable nanocomposites, which are used as implantable devices in the body such as bioscrews, is a crucial factor. In the current paper, we are investigating these biomaterials -short-time creep and creep recover manners- in several classic models.
Methods: The creep and creep recovery behaviors of nanocomposites composed of biodegradable polymer blends, poly (D/L) lactic acid (PDLLA) and polycaprolactone (PCL) reinforced with three different contents of 1, 3 and 6 percent weight percentage (Full name?)% bioactive glass nanoparticles (m-BGn) were modeled. Several theoretical models including Findley power law, Burgers and Weibull models were used to establish the relations between m-BGn dispersion and final creep and creep-recovery behaviors of nanocomposites.
Results: The Findley power law model confirmed that the lowest ‘A’ and highest ‘n’ parameters ( A is the amplitude of the transient creep strain and n is the time exponent) belong to the sample with the highest young modulus and the nanocomposites compared to PDLLA/PCL blends have the lower ‘A’ and higher ‘n’ which can be related to retardation effect of m-BGn on creep strains. Besides, the burgers model results illustrated that all viscoelastic and viscoplastic parameters for nanocomposites possess higher values than those of the neat PDLLA/PCL blend. It means that the addition of glass nanoparticles leads to decrease creep strain , increasing the Burgers model prediction values which have inverse trend with . Moreover, the weibull distribution model results acknowledge that the introduction of m-BGn into PDLLA/PCL polymeric blends cause decrease in the viscoelastic strain recovery values. This is due to hindering effects of m-BGn on creep recovery behavior of nanocomposites.
Conclusion: The results obtained from modeling of creep-recovery manners of PDLLA/PCL blend and its nanocomposites approved that the bioactive glass reinforcement nanoparticles play impeding role on creep and creep recovery behaviors.
Level of evidence: I
Keywords
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