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Transparent perfluoropolyethers for vacuum ultraviolet applications.
Mattia Bassi1, Pier-Antonio Guarda, Elvira Pagano
1Solvay-Solexis R&D Center, Viale Lombardia 20, Bollate, Milano I-20021, Italy. mattia.bassi@solvay.com
The Journal of Physical Chemistry. B
|June 28, 2006
Summary
Researchers developed new linear perfluoropolyethers (PFPEs) with low optical absorbance for vacuum ultraviolet (VUV) applications. The -OCF2- unit was identified as the most transparent segment in the VUV region.
Area of Science:
- Materials Science
- Physical Chemistry
- Polymer Science
Background:
- Perfluoropolyethers (PFPEs) are crucial in various industrial applications.
- Understanding their optical properties in the vacuum ultraviolet (VUV) region is essential for advanced applications.
- Previous studies have not fully characterized PFPEs for VUV transparency.
Purpose of the Study:
- To synthesize and characterize novel linear perfluoropolyethers (PFPEs) with enhanced transparency in the VUV region.
- To identify the key structural components responsible for VUV optical absorbance.
- To establish structure-property relationships for optimizing PFPEs for VUV applications.
Main Methods:
- Broad scouting using quantum chemical calculations.
- Optical absorption measurements in the 140-190 nm VUV range.
- Careful elimination of external contamination sources, particularly atmospheric gases.
Main Results:
- A novel family of linear PFPEs was synthesized with optical absorbance at 157 nm between 0.3 and 0.6 cm(-1).
- The backbone structure and chain end composition were analyzed for their contributions to VUV absorption.
- -OCF2- was identified as the most transparent segmental unit in the VUV region.
Conclusions:
- The study successfully synthesized novel PFPEs with tunable VUV transparency.
- The findings provide a pathway for designing advanced materials for VUV-based technologies.
- The -OCF2- segment is critical for achieving high transparency in PFPEs for VUV applications.