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

Slobodan Sirovica, Johanne H. Solheim, Maximilian W. A. Skoda, Carol J. Hirschmugl, Eric C. Mattson, Ebrahim Aboualizadeh, Yilan Guo, Xiaohui Chen, Achim Kohler, Dan L. Romanyk, Scott M. Rosendahl, Suzanne Morsch, Richard A. Martin and Owen Addison ()
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Slobodan Sirovica: King’s College London, Guy’s Hospital
Johanne H. Solheim: Norwegian University of Life Sciences
Maximilian W. A. Skoda: Rutherford Appleton Laboratory
Carol J. Hirschmugl: University of Wisconsin-Milwaukee
Eric C. Mattson: University of Texas at Dallas
Ebrahim Aboualizadeh: University of Wisconsin-Milwaukee
Yilan Guo: University of Alberta
Xiaohui Chen: The University of Manchester
Achim Kohler: Norwegian University of Life Sciences
Dan L. Romanyk: University of Alberta
Scott M. Rosendahl: Canadian Light Source Inc.
Suzanne Morsch: The University of Manchester
Richard A. Martin: Aston University
Owen Addison: King’s College London, Guy’s Hospital

Nature Communications, 2020, vol. 11, issue 1, 1-10

Abstract: 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.

Date: 2020
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DOI: 10.1038/s41467-020-15669-z

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