Investigating Mechanical Properties of PGLA Fibres as a Function of Degradation Time

• Type: Article in International Conference Proceedings Book
• Date: 2020

Authors

Singh, A (Author) Other; Rui Miranda Guedes (Author) FEUP

Conference proceedings International

Title: 1ST VIRTUAL EUROPEAN CONFERENCE ON FRACTURE - VECF1

Pages: 2218-2227

1st European-Structural-Integrity-Society (ESIS) Virtual European Conference on Fracture (ECF)

ELECTR NETWORK, JUN 29-JUL 01, 2020

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Authenticus ID: P-00T-CXX

DOI: 10.1016/j.prostr.2020.11.050

Abstract (EN): Medical applications of PGLA fibres in the form of scaffolds is dependent on the mechanical and degradation properties of these fibres. Aim of this study is to investigate the mechanical properties of PGLA fibres depending on its degradation rate. Results from this investigation helps to utilise PGLA fibres in a composite cord with different biodegradable filaments. Use of the composite cord helps in tuning the rate of degradation. Further, the information from this study help to design and simulate the Ligament Augmentation Device (LAD) made of different biodegradable filaments for Anterior Cruciate Ligament (ACL) injuries. The effect of strain rate and degradation on various mechanical parameters were studied. Seven degradation stages viz. 0, 5, 10, 15, 20, 30 and 40 days were used for degradation studies at a constant temperature of 37 degrees C. In-vitro degradation uses Phosphate buffer solution (PBS) as a degradation medium. Five different strain rates viz. 0.0001, 0.001, 0.01, 0.05 and 0.1/s were used to perform the tensile tests of PGLA fibres. Differential Scanning Calorimetry (DSC) was performed to analyse the effect of degradation on the transition temperatures and crystallinity of undegraded and in-vitro degraded PGLA fibres. Mechanical properties first increase up to 15 days of degradation, and then the decay starts due to the chain scission. Change of glassy to rubbery behaviour occurs at a lower temperature. Percentage crystallinity of PGLA fibres throughout degradation stages remains in between 30 40 %. Complete deterioration of mechanical properties in PGLA was observed after 40 days of degradation at 37 degrees C. (C) 2020 The Authors. Published by Elsevier B.V.

Language: English

Type (Professor's evaluation): Scientific

No. of pages: 10