研究目的
Investigating the changes in the surface of polytetrafluoroethylene (PTFE) irradiated with an IR laser by Raman spectroscopy to understand the structural modifications and the formation of new materials.
研究成果
The action of laser radiation in the pre-ablation mode changes the chemical structure of the polymer, leading to branching and the formation of CF3 groups as a result of the destruction of the polymer chain as well as the carbonization of the polymer chain. The supramolecular structure also changes, and the degree of change depends on the integral radiation fluence. The calculated Raman spectra are in good agreement with the experimental findings.
研究不足
The study focuses on the surface changes of PTFE under IR-laser irradiation and does not extensively explore the bulk properties or the long-term stability of the modified polymer. The computational models used for interpreting the Raman spectra are simplified and may not fully capture the complexity of the polymer structure.
1：Experimental Design and Method Selection:
The study used Raman spectroscopy to investigate the surface of PTFE after IR-laser irradiation. Three selected zones, which differ in the degree of distance from the laser beam axis, were probed to understand regions of high and low fluences.
2：Sample Selection and Data Sources:
Samples of PTFE in the form of sheets were acquired from the KCKK Polymer Plant Ltd with brand names F-
3：List of Experimental Equipment and Materials:
The laser treatment was conducted using an LGN-703 CO2 laser (wavelength 10.6 μm, beam diameter at the target surface 9 mm). Raman scans were taken with a Jobin-Yvon HR800 UV confocal microscope. XPS spectra were acquired with an ESCALAB-5 spectrometer.
4：6 μm, beam diameter at the target surface 9 mm). Raman scans were taken with a Jobin-Yvon HR800 UV confocal microscope. XPS spectra were acquired with an ESCALAB-5 spectrometer.
Experimental Procedures and Operational Workflow:
4. Experimental Procedures and Operational Workflow: The laser treatment was conducted in the vacuum chamber of a VUP-4 facility. The Raman scans were taken with a HeNe laser with approximately 12 mW of power at the sample.
5：Data Analysis Methods:
The shifts were detected using a Peltier cooled CCD detector. Density functional theory calculations were used to help in interpreting the Raman spectra.
独家科研数据包，助您复现前沿成果，加速创新突破
获取完整内容
