Strain-rate dependence of mechanical characteristics of PLLA with different MW
Dynamic mechanical properties of polymers for biomedical applications are crucial parameters for development and engineering of new medical devices. Here, the time-dependent material behavior is a key factor for durability. Varying the strain rate is a convenient implementation of time-dependency fo...
| Main Authors: | , , , |
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| Format: | Article |
| Language: | English |
| Published: |
De Gruyter
2023-09-01
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| Series: | Current Directions in Biomedical Engineering |
| Subjects: | |
| Online Access: | https://doi.org/10.1515/cdbme-2023-1115 |
| _version_ | 1797646303559155712 |
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| author | Fiedler Nicklas Oschatz Stefan Grabow Niels Lebahn Kerstin |
| author_facet | Fiedler Nicklas Oschatz Stefan Grabow Niels Lebahn Kerstin |
| author_sort | Fiedler Nicklas |
| collection | DOAJ |
| description | Dynamic mechanical properties of polymers for biomedical applications are crucial parameters for development and engineering of new medical devices. Here, the time-dependent material behavior is a key factor for durability. Varying the strain rate is a convenient implementation of time-dependency for uniaxial testing. This study investigates time-dependence of Poly(L-Lactide) (PLLA) through uniaxial testing with different strain rates and PLLA with different molecular weight. The results show strain dependence for elongation at break and yield stress, Young’s modulus however is not rate dependent. An increase in elongation at break is also seen with increasing molecular weight of PLLA. Plastic strain increases significantly only for PLLA with an intermediate inherent viscosity. Results show distinct time dependencies regarding strain rate for PLLA with slightly different inherent viscosities. For stent-related mechanical material characteristics, higher molecular weight PLLA seems to be advantageous. This study only considers base materials, although appropriate thermal, mechanical as well as chemical post processing approaches for further adjustment of different properties have already been shown. A combination of the best possible base material and a suitable post-processing should be targeted. |
| first_indexed | 2024-03-11T15:00:41Z |
| format | Article |
| id | doaj.art-52b7c87d8487465e8f647b0e3b5c53bc |
| institution | Directory Open Access Journal |
| issn | 2364-5504 |
| language | English |
| last_indexed | 2024-03-11T15:00:41Z |
| publishDate | 2023-09-01 |
| publisher | De Gruyter |
| record_format | Article |
| series | Current Directions in Biomedical Engineering |
| spelling | doaj.art-52b7c87d8487465e8f647b0e3b5c53bc2023-10-30T07:58:12ZengDe GruyterCurrent Directions in Biomedical Engineering2364-55042023-09-019145946210.1515/cdbme-2023-1115Strain-rate dependence of mechanical characteristics of PLLA with different MWFiedler Nicklas0Oschatz Stefan1Grabow Niels2Lebahn Kerstin3Institute for Biomedical Engineering, Rostock University Medical Center, Friedrich- Barnewitz-Str. 4, 18119Rostock, GermanyInstitute for Biomedical Engineering, Rostock University Medical Center, Rostock, GermanyInstitute for Biomedical Engineering, Rostock University Medical Center, Rostock, GermanyInstitute for Biomedical Engineering, Rostock University Medical Center, Rostock, GermanyDynamic mechanical properties of polymers for biomedical applications are crucial parameters for development and engineering of new medical devices. Here, the time-dependent material behavior is a key factor for durability. Varying the strain rate is a convenient implementation of time-dependency for uniaxial testing. This study investigates time-dependence of Poly(L-Lactide) (PLLA) through uniaxial testing with different strain rates and PLLA with different molecular weight. The results show strain dependence for elongation at break and yield stress, Young’s modulus however is not rate dependent. An increase in elongation at break is also seen with increasing molecular weight of PLLA. Plastic strain increases significantly only for PLLA with an intermediate inherent viscosity. Results show distinct time dependencies regarding strain rate for PLLA with slightly different inherent viscosities. For stent-related mechanical material characteristics, higher molecular weight PLLA seems to be advantageous. This study only considers base materials, although appropriate thermal, mechanical as well as chemical post processing approaches for further adjustment of different properties have already been shown. A combination of the best possible base material and a suitable post-processing should be targeted.https://doi.org/10.1515/cdbme-2023-1115strain ratepolymerpllamolecular weight |
| spellingShingle | Fiedler Nicklas Oschatz Stefan Grabow Niels Lebahn Kerstin Strain-rate dependence of mechanical characteristics of PLLA with different MW Current Directions in Biomedical Engineering strain rate polymer plla molecular weight |
| title | Strain-rate dependence of mechanical characteristics of PLLA with different MW |
| title_full | Strain-rate dependence of mechanical characteristics of PLLA with different MW |
| title_fullStr | Strain-rate dependence of mechanical characteristics of PLLA with different MW |
| title_full_unstemmed | Strain-rate dependence of mechanical characteristics of PLLA with different MW |
| title_short | Strain-rate dependence of mechanical characteristics of PLLA with different MW |
| title_sort | strain rate dependence of mechanical characteristics of plla with different mw |
| topic | strain rate polymer plla molecular weight |
| url | https://doi.org/10.1515/cdbme-2023-1115 |
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