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An atomic finite element model for biodegradable polymers. Part 2. A model for change in Young's modulus due to polymer chain scission

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journal contribution
posted on 2016-05-05, 11:28 authored by Andrew Gleadall, Jingzhe Pan, Marc-Anton Kruft
Atomic simulations were undertaken to analyse the effect of polymer chain scission on amorphous poly(lactide) during degradation. Many experimental studies have analysed mechanical properties degradation but relatively few computation studies have been conducted. Such studies are valuable for supporting the design of bioresorbable medical devices. Hence in this paper, an Effective Cavity Theory for the degradation of Young's modulus was developed. Atomic simulations indicated that a volume of reduced-stiffness polymer may exist around chain scissions. In the Effective Cavity Theory, each chain scission is considered to instantiate an effective cavity. Finite Element Analysis simulations were conducted to model the effect of the cavities on Young's modulus. Since polymer crystallinity affects mechanical properties, the effect of increases in crystallinity during degradation on Young's modulus is also considered. To demonstrate the ability of the Effective Cavity Theory, it was fitted to several sets of experimental data for Young's modulus in the literature.

Funding

Andrew Gleadall acknowledges an EPSRC PhD studentship and a partial PhD studentship from the University of Leicester.

History

Citation

Journal of the Mechanical Behavior of Biomedical Materials, 2015, 51, pp. 237–247

Author affiliation

/Organisation/COLLEGE OF SCIENCE AND ENGINEERING/Department of Engineering

Version

  • AM (Accepted Manuscript)

Published in

Journal of the Mechanical Behavior of Biomedical Materials

Publisher

Elsevier

issn

1751-6161

eissn

1878-0180

Acceptance date

2015-07-15

Copyright date

2015

Available date

2017-07-31

Publisher version

http://www.sciencedirect.com/science/article/pii/S1751616115002519

Notes

The file associated with this record is under a 24-month embargo from publication in accordance with the publisher's self-archiving policy. The full text may be available through the publisher links provided above.

Language

en

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