研究目的
To fabricate light-responsive UHMW PE tapes and fibers using spiropyran as a photochromic additive for creating rewritable optical patterns.
研究成果
A facile method is presented for fabricating light-responsive UHMW PE tapes and fibers using spiropyran, enabling rewritable optical patterns through UV light, heat, or green light irradiation. This approach allows for applications in optical storage, sensors, and anti-counterfeiting, with potential for extension to other polymers and improved reversibility using more stable dyes.
研究不足
The rewritable process can only be used a couple of times due to typical behavior of nitro-spiropyran derivatives, and the reversibility might be limited by the stability of the dye.
1：Experimental Design and Method Selection:
The study involves incorporating spiropyran (SP) into UHMW PE during gel casting or by diffusion into fibers to exploit its photochromic properties for reversible color changes upon UV and green light irradiation or heat.
2：Sample Selection and Data Sources:
UHMW PE tapes and fibers are used, with SP added at 3 wt% during gel casting or post-processing. Samples are drawn to specific draw ratios (e.g., 30 and 60) on a hot plate.
3：List of Experimental Equipment and Materials:
Equipment includes an Exfo UV lamp (320-500 nm, 80 mJ.cm-2 dose), a green LED light (565 nm, ~15 mJ.cm-2 intensity), a Shimadzu UV-3102 PC spectrophotometer for UV-Vis spectroscopy, and materials such as UHMW PE, SP, xylene, anti-oxidant Irganox 1010, aluminum trays, and quartz slides.
4：Experimental Procedures and Operational Workflow:
For tapes, SP and UHMW PE are dissolved in xylene at 135°C, cast into trays, evaporated, cut, and drawn. For fibers, SP is diffused from xylene solution. Irradiation with UV light through a mask creates patterns; erasure is done with heat (70°C) or green light. UV-Vis spectra are measured to monitor isomerization.
5：Data Analysis Methods:
Data is analyzed using first-order exponential fits for kinetics, with absorbance measured at 550 nm to track SP to MC conversion and vice versa.
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