研究目的
Developing new types of thermochromism dyes in polymers with high emission contrast, fast responsiveness, and good repeatability for applications in thermo-history recording, sensing, and anti-counterfeiting.
研究成果
The OD-CN doped LLDPE blends have great application potentials in the multi-channel anti-counterfeiting through colour and intensity changes at different temperatures. The strategy of blending fluorophores with ICT effect and solid-state emission in apolar polymer to realize thermochromism is general.
研究不足
The current reported organic thermochromic systems still have the drawbacks of slow responsive speed, low colour contrast and unsatisfactory repeatability.
1：Experimental Design and Method Selection:
Synthesis of a twisted fluorophore based on 1,4-bis[2,2-bisphenyl-vinyl]benzene skeleton with A-D-A structure (OD-CN) through Witting and Knoevenagel reactions.
2：Sample Selection and Data Sources:
OD-CN was embedded into apolar polymer of LLDPE with different concentrations by melting process.
3：List of Experimental Equipment and Materials:
Bruker AVANCE500 for NMR, Thermo Fisher ITQ1100 for mass spectra, Analytikjena apecord
4：10 plus for UV–Vis spectra, Shimadzu RF-5301 PC spectrofluorimeter for fluorescence spectra, Edinburgh Instrument LS920 for fluorescent quantum yields, leica DM4000 M LED for microscope images. Experimental Procedures and Operational Workflow:
Measurement of absorption and emission spectra in different solvents and solid states, observation of existent states of OD-CN in LLDPE using fluorescence microscope, testing of thermochromic properties.
5：Data Analysis Methods:
Calculation of electron orbitals of OD-CN based on density functional theory (DFT) with Gaussian 09 program package.
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