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. 2020 Sep 1;12(9):1989.
doi: 10.3390/polym12091989.

A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

Saiqi Tian  1   2 , Yinyan Chen  1 , Yifan Zhu  1 , Haojun Fan  2   3
Affiliations

A Fluorescent Polyurethane with Covalently Cross-Linked Rhodamine Derivatives

Saiqi Tian et al. Polymers (Basel). .

Abstract

Rhodamine derivatives (RDs) with three reactive hydrogens were synthesized and well characterized by Fourier transform infra-red spectroscopy (FTIR), 1H nuclear magnetic resonance (1H NMR) and electrospray ionization mass spectra (ESI mass). Then, the obtained RD was covalently cross-linked into polyurethane (PU) matrix through chemical linkages to fabricate a network structure, and the fluorescent properties, mechanical properties, thermal stability, and emulsion particle size were systematically investigated. Results demonstrate that PU-RD maintains initial fluorescent properties and emits desirable yellow fluorescence under ultraviolet irradiation. Moreover, compared with linear PU without fluorescers, PU-RD shows clearly improved mechanical properties and thermal stability, on account of the formed network structures.

Keywords: crosslink; fluorescent; polyurethane; rhodamine.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Scheme 1
Scheme 1
Synthesis of RD.
Figure 1
Figure 1
FTIR spectra of Rhodamine 6G and RD.
Figure 2
Figure 2
Digital images of Rhodamine 6G and RD.
Figure 3
Figure 3
1H NMR spectrum of RD.
Figure 4
Figure 4
ESI mass spectrum of RD.
Figure 5
Figure 5
FTIR spectra of PU and PU-RD.
Figure 6
Figure 6
Fluorescent emission spectra of PU and PU-RDs. The inset is fluorescent emission spectrum of RD.
Figure 7
Figure 7
Digital images of PU and PU-RDs taken in daylight and under 365nm UV irradiation in darkness.
Figure 8
Figure 8
Stress–strain curves of PU and PU-RDs.
Figure 9
Figure 9
DMA curves of PU and PU-RDs.
Figure 10
Figure 10
(a) Thermogravimetric and curves and DTG of PU and PU-RD-3; (b) Fluorescent emission spectra of PU-RD before and after thermal exposure.
Figure 11
Figure 11
Particle size distribution of PU and PU-RDs emulsions.
Figure 12
Figure 12
Emulsion particle schematic diagram of PU and PU-RD.
See this image and copyright information in PMC

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