Journal
MATERIALS RESEARCH BULLETIN
Volume 140, Issue -, Pages -Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.materresbull.2021.111295
Keywords
Interfaces; Optical materials; Luminescence; Mechanical properties
Categories
Funding
- National Natural Science Foundation of China [81970976, 51805519, 51402139]
- Natural Science Foundation for Distinguished Young Scholars of Gansu Province [20JR5RA572]
- One-Three-Five Strategic Planning of CAS
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By extending the mechanoluminescent material of ZnS:Mn2+ from polydimethylsiloxane to polyurethane, significant improvements on elastic modulus and mechanoluminescence intensity were achieved, proposing an enhanced mechanoluminescence mechanism for ZnS:Mn2+ in polyurethane. The as-fabricated ZnS:Mn2+/polyurethane flexible composite shows promising applications in various fields for mechanics visualizations.
In this work, we extend the flexible matrix for the mechanoluminescent material of wurtzite ZnS:Mn2+ from conventional polydimethylsiloxane to polyurethane. The results from scanning electron microscopy images and stress-strain curves suggest that there are interfacial interactions between polyurethane chains and ZnS:Mn2+ particles, arousing a significant improvement on the elasticity modulus. The interactions are beneficial for the mechanical energy transfer from polyurethane chains to the embedded ZnS:Mn2+ particles, and thus achieving ca. 40 % improvement on the mechanoluminescence intensity compared to the ZnS:Mn2+/polydimethylsiloxane composite. The Fourier transform infrared spectroscopy results further identify that the interfacial interactions in ZnS:Mn2+/polyurethane should come from the formation of hydrogen bond between -NH- and ZnS:Mn2+, and therefore the enhanced mechanoluminescence mechanism of ZnS:Mn2+ in polyurethane is proposed. Because of the unique application scopes of polyurethane, the as-fabricated ZnS:Mn2+/polyurethane flexible composite shows promising applications in the fields of architectural structure, mechanical seal and aviation industry for mechanics visualizations.
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