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Constitutive law of degrading polymers published.pdf (2.24 MB)

A constitutive law for degrading bioresorbable polymers

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journal contribution
posted on 2016-05-05, 10:58 authored by Hassan Samami, Jingzhe Pan
This paper presents a constitutive law that predicts the changes in elastic moduli, Poisson's ratio and ultimate tensile strength of bioresorbable polymers due to biodegradation. During biodegradation, long polymer chains are cleaved by hydrolysis reaction. For semi-crystalline polymers, the chain scissions also lead to crystallisation. Treating each scission as a cavity and each new crystal as a solid inclusion, a degrading semi-crystalline polymer can be modelled as a continuum solid containing randomly distributed cavities and crystal inclusions. The effective elastic properties of a degrading polymer are calculated using existing theories for such solid and the tensile strength of the degrading polymer is predicted using scaling relations that were developed for porous materials. The theoretical model for elastic properties and the scaling law for strength form a complete constitutive relation for the degrading polymers. It is shown that the constitutive law can capture the trend of the experimental data in the literature for a range of biodegradable polymers fairly well.

History

Citation

Journal of the Mechanical Behavior of Biomedical Materials, 2016, 59, pp. 430–445

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

2016-02-19

Copyright date

2016

Available date

2018-03-02

Publisher version

http://www.sciencedirect.com/science/article/pii/S1751616116000795

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