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Oschatz, Stefan
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Publications (4/4 displayed)
- 2023Strain-rate dependence of mechanical characteristics of PLLA with different MW
- 2022Thermal annealing of injection molded VHMW PLLAcitations
- 2021Polymer selection for Eustachian tube stent application based on mechanical, thermal and degradation behavior
- 2021Definition of test parameters for dynamic mechanical testing of polymeric implant materialscitations
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article
Thermal annealing of injection molded VHMW PLLA
Abstract
<jats:title>Abstract</jats:title><jats:p>In this study, DSC experiments were used to elaborate an annealing protocol for injection molded very high molecular weight (VHMW) PLLA with two molecular masses, 320,000 g/mol and 700,000 g/mol. The initial material obtained from the injection molding process was found to be highly amorphous and not in thermodynamic equilibrium state, as distinct cold crystallization and enthalpy relaxation were observed in DSC data. Thermal annealing to 85 °C for 60 - 90 min under controlled conditions using a DSC device showed to be sufficient to stabilize the polymer and increase the crystallinity to up to 50 %. Annealing did not result in any signs of thermal decomposition. The elaborated thermal treatment has been transferred to manual annealing of large specimen geometries for subsequent DMA analysis.</jats:p>