Journal article

Insights into the mechanochromism of spiropyran elastomers

Wenlian Qiu, Paul A Gurr, Gabriel da Silva, Greg G Qiao



Colourless polymeric samples comprising mechanochromic spiropyrans (SPs) rapidly appear coloured under external pressure, due to their transition from ring-closed SP to ring-open merocyanine (MC). Here, we design a new spiropyran with three attachment points which was systematically compared with two widely used spiropyrans having two attachment positions in the same PDMS matrix on their mechanochromic properties, to determine whether the geometric effect or electronic effect dominates the force-responses. The attachment positions on the chromene ring on the three spiropyrans are identical, with varying attachment positions on the indoline ring. RGB colour analysis and in situ absorption mea..

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Awarded by Australian Government through the Australian Research Council

Awarded by Australian Research Council

Funding Acknowledgements

This research was funded partially by the Australian Government through the Australian Research Council. IH120100053 "Unlocking the Food Value Chain: Australian industry transformation for ASEAN markets." W. Qiu is thankful to the University of Melbourne for providing the Melbourne International Research Scholarship. G. da Silva is supported by the Australian Research Council through the Future Fellowship program (FT130101304).