Shree, S., Schulz-Senft, M., Alsleben, N. H., Mishra, Y. K., Staubitz, A. and Adelung, Rainer (2017) Light, Force, and Heat: A Multi-Stimuli Composite that Reveals its Violent Past. ACS Applied Materials & Interfaces, 9 (43). pp. 38000-38007. DOI 10.1021/acsami.7b09598.

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Abstract

A self-reporting polythiourethane/tetrapodal-ZnO (PTU/T-ZnO) composite is produced using spiropyran as an additive at a concentration as low as 0.5 wt %. Exposure to heat, UV light and mechanical force caused the spiropyran to undergo reversible isomerization indicated by a reversible color change. The studies have been conducted with a constant spiropyran concentration at 0.5 wt %, meanwhile varying the T-ZnO concentration from 0 to 7.5 wt %. The tetrapodal ZnO served as a prism: the light scattering effect of T-ZnO created a visual impression of uniform color distribution. The interconnected network of the tetrapodal of ZnO embedded in the PTU matrix enhanced the mechanical stability of the polymer leading to high impact resistance up to ∼232 kPa. PTU/spiropyran also emerged as a possible thermal sensing coating, due to its temperature sensitivity. Due to the broad green luminescence band (∼535 nm) in T-ZnO, the colored merocyanine form which absorbs in this region of the spectrum switches back to spiropyran at this wavelength. High concentrations of T-ZnO were shown to reduce the effect one of the switching triggers i.e., ultraviolet light. Using this property of T-ZnO it was possible to achieve a switchable system with the possibility of separating the stimuli.

Document Type:	Article
Keywords:	merocyanine (MC); photochromic; polythiourethane (PTU); Self-reporting spiropyran switch; tetrapodal-zinc oxide (T-ZnO); thermochromic and mechanochromic properties
Research affiliation:	Kiel University > Kiel Marine Science OceanRep > The Future Ocean - Cluster of Excellence
Refereed:	Yes
Open Access Journal?:	Yes
Publisher:	American Chemical Society
Date Deposited:	12 Dec 2017 13:39
Last Modified:	13 May 2019 10:41
URI:	https://oceanrep.geomar.de/id/eprint/40547

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