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. 2020 Oct 7;12(10):2296.
doi: 10.3390/polym12102296.

Luminescent Cellulose Fibers Modified with Poly((9-Carbazolyl)Methylthiirane)

Aleksandra Erdman  1 , Piotr Kulpinski  2 , Jadwiga Gabor  3 , Arkadiusz Stanula  4 , Andrzej S Swinarew  3   4
Affiliations

Luminescent Cellulose Fibers Modified with Poly((9-Carbazolyl)Methylthiirane)

Aleksandra Erdman et al. Polymers (Basel). .

Abstract

This article presents the results of research related to the development of cellulose man-made fibers with luminescent properties. The fibers were obtained from regenerated cellulose with the use of the N-Methylmorpholine-N-Oxide (NMMO) method for lyocell (Tencel) fiber formation. The method is named after the cellulose solvent (NMMO) used to obtain the spinning solution. Fibers are formed by the dry-wet spinning method. Due to the characteristic of the lyocell process, the fibers were easily modified to achieve luminescent properties with star-shaped organic compound poly((9-carbazolyl)methylthiirane) (KMT). Fibers were examined on their mechanical parameters with the use of Zwick Z2.5/TN1S tensile testing machine, and the results show the influence of the KMT concentration in the fiber matrix on mechanical parameters of the fibers. The study also attempted to determine the concentration of the modifier in the fibers with the use of UV-VIS Spectrofluorometer JASCO. The luminescent properties of fibers were estimated as well, using Jobin-Yvon spectrofluorometer FLUOROMAX-4, and the results are very promising as the fibers emit blue light in the range of visible light spectrum even for small concentrations of KMT (about 0.1 wt.%).

Keywords: cellulose fibers; luminescent fibers; lyocell fibers; security fibers.

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Conflict of interest statement

The authors declare no conflict of interest.

Figures

Figure 1
Figure 1
Scheme of man–made cellulose fibers formation in laboratory scale and typical conditions during the process.
Scheme 1
Scheme 1
Synthesis of star-shaped luminescent poly((9-carbazolyl)methylthiirane).
Figure 2
Figure 2
Excitation (a) and emission (b) spectra of fibers modified with luminescent polymer KMT.
Figure 3
Figure 3
Optical observation of fibers: (a) fibers in visible light, (b) fibers without modifier under UV light with a 365 nm wavelength, and (c) fibers with 0.1 wt.% of KMT under UV with a 365 nm wavelength.
Figure 4
Figure 4
Optical observation of paper modified with fibers containing KMT: (a) paper under 254 nm wavelength, no emission of light; (b) paper under 365 nm wavelength, visible emission of fibers with KMT.
Figure 5
Figure 5
Graphic showing the lyocell fibers in paper structure prepared from Scanning Electron Microscopy (SEM) observation.
See this image and copyright information in PMC

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