Origin of micro-scale heterogeneity in polymerisation of photo-activated resin composites

Abstract

Photo-activated resin composites are widely used in industry and medicine. Despite extensive chemical characterisation, the micro-scale pattern of resin matrix reactive group conversion between filler particles is not fully understood. Using an advanced synchrotron-based wide-field IR imaging system and state-of-the-art Mie scattering corrections, we observe how the presence of monodispersed silica filler particles in a methacrylate based resin reduces local conversion and chemical bond strain in the polymer phase. Here we show that heterogeneity originates from a lower converted and reduced bond strain boundary layer encapsulating each particle, whilst at larger inter-particulate distances light attenuation and monomer mobility predominantly influence conversion. Increased conversion corresponds to greater bond strain, however, strain generation appears sensitive to differences in conversion rate and implies subtle distinctions in the final polymer structure. We expect these findings to inform current predictive models of mechanical behaviour in polymer-composite materials, particularly at the resin-filler interface.

Publication DOI: https://doi.org/10.1038/s41467-020-15669-z
Divisions: Engineering & Applied Sciences > Electrical, Electronic & Power Engineering
Additional Information: This article is licensed under a Creative Commons Attribution 4.0 International License, which permits use, sharing, adaptation, distribution and reproduction in any medium or format, as long as you give appropriate credit to the original author(s) and the source, provide a link to the Creative Commons license, and indicate if changes were made. The images or other third party material in this article are included in the article’s Creative Commons license, unless indicated otherwise in a credit line to the material. If material is not included in the article’s Creative Commons license and your intended use is not permitted by statutory regulation or exceeds the permitted use, you will need to obtain permission directly from the copyright holder. To view a copy of this license, visit http://creativecommons.org/licenses/by/4.0/. Funding: S.S. was funded by the Global Challenges Studentship from the Science and Technology Facilities Council (award no. ST/L502510/1).
Uncontrolled Keywords: Chemistry(all),Biochemistry, Genetics and Molecular Biology(all),Physics and Astronomy(all)
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Related URLs: https://www.nat ... 69-z?proof=true (Publisher URL)
http://www.scop ... tnerID=8YFLogxK (Scopus URL)
PURE Output Type: Article
Published Date: 2020-04-15
Accepted Date: 2020-03-20
Authors: Sirovica, Slobodan
Solheim, Johanne H.
Skoda, Maximilian W. A.
Hirschmugl, Carol J.
Mattson, Eric C.
Aboualizadeh, Ebrahim
Guo, Yilan
Chen, Xiaohui
Kohler, Achim
Romanyk, Dan L.
Rosendahl, Scott M.
Morsch, Suzanne
Martin, Richard A. ( 0000-0002-6013-2334)
Addison, Owen

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