Structural changes of block copolymers with bi-modal orientation under fast cyclical stretching as observed by synchrotron SAXS

Soft Matter
Joanna StasiakGeoff D Moggridge

Abstract

Load-bearing tissues are composite materials that depend strongly on anisotropic fibre arrangement to maximise performance. One such tissue is the heart valve, with orthogonally arranged fibrosa and ventricularis layers. Their function is to maintain mechanical stress while being resilient. It is postulated that while one layer bears the applied stress, the orthogonal layer helps to regenerate the microstructure when the load is released. The present paper describes changes in the microstructure of a block copolymer with cylindrical morphology, having a bio-inspired microstructure of anisotropic orthogonally oriented layers, under uniaxial strain. To allow structural observations during fast deformation, equivalent to the real heart valve operation, we used a synchrotron X-ray source and recorded 2D SAXS patterns in only 1 ms per frame. The deformation behaviour of the composite microstructure has been reported for two arrangements of the cylinders in skin and core layers. The behaviour is very different to that observed either for uniaxially oriented or isotropic samples. Deformation is far from being affine. Cylinders aligned in the direction of stretch show fragmentation, but complete recovery of the spacing between cylinder...Continue Reading

References

May 17, 2006·Acta Biomaterialia·Shrirang V RanadeMichael N Helmus
Sep 25, 2007·Journal of Biomechanical Engineering·John A Stella, Michael S Sacks
Nov 6, 2007·Biomaterials·Leonard PinchukJoseph P Kennedy
Nov 22, 2011·Journal of the Mechanical Behavior of Biomedical Materials·Afshin Anssari-BenamHazel R C Screen
Mar 27, 2012·Journal of Biomedical Materials Research. Part a·Caitlin Martin, Wei Sun
Nov 12, 2013·Bio-medical Materials and Engineering·Joanna StasiakGeoff D Moggridge
Nov 20, 2013·Analytical Chemistry·Mark D BorysiakJonathan D Posner

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Citations

Mar 29, 2016·Journal of Biomechanical Engineering·M SerraniG D Moggridge
May 6, 2021·Journal of Synchrotron Radiation·A J SmithN J Terrill

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Methods Mentioned

BETA
X-ray

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