Correlating the mass and mechanical property changes during the degradation of PEG‐based adhesive
Document Type
Article
Publication Date
9-6-2019
Department
Department of Biomedical Engineering
Abstract
Change in mechanical property of a degrading adhesive is critical to its performance. However, characterization of degradation behavior is often limited to tracking its mass loss. Four‐armed poly(ethylene glycol) end modified with dopamine (PEG‐DA) was used as a model bioadhesive to correlate its change in mass with change in mechanical property. Shear modulus (G) was calculated based on the mass and average molecular weight between crosslinks () of PEG‐DA, while the storage modulus (G′) was determined by oscillatory rheometry. G decreased slowly within the first week of degradation (4% reduction by week 2), while G′ decreased by 60% during the same period. This large discrepancy is due to the partially disconnected and elastically ineffective PEG polymer, which is trapped within the adhesive network. This resulted in minimal mass change and higher calculated G value during the earlier time points. Therefore, tracking mass loss profile alone is inadequate to completely describe the degradation behavior of an adhesive. Additionally, PEG‐DA was coated onto magnetoelastic (ME) sensors, and the change in the resonance amplitude of the sensor corresponded well with dry mass loss of PEG‐DA. ME sensing provides a nondestructive method to track the mass loss of the coated adhesive.
Publication Title
Journal of Applied Polymer Science
Recommended Citation
Zhang, Z.,
Pinnaratip, R.,
&
Ong, K. G.
(2019).
Correlating the mass and mechanical property changes during the degradation of PEG‐based adhesive.
Journal of Applied Polymer Science.
http://doi.org/10.1002/app.48451
Retrieved from: https://digitalcommons.mtu.edu/michigantech-p/829
Publisher's Statement
© 2019 Wiley Periodicals, Inc. Publisher’s version of record: https://doi.org/10.1002/app.48451