US EPA

3860606 

Journal Article 

Transparent perfluoropolyethers for vacuum ultraviolet applications 

Bassi, M; Guarda, PA; Pagano, E; Sanguineti, A; Marchionni, G 

2006 

Yes 

Journal of Physical Chemistry B
ISSN: 1520-6106
EISSN: 1520-5207 

110 

24 

12172-12178 

English 

16800533 

10.1021/jp060205f 

WOS:000238284600082 

After a broad scouting based on quantum chemical calculations, optical absorption measurements in the vacuum ultraviolet (VUV) wavelength region between 140 and 190 nm were performed on a narrower series of commercial and experimental liquids. By elimination of sources of external contamination, mainly due to atmospheric gases, the analysis of the contributions to the absorption related to the backbone structure and to the chain end composition allowed the synthesis of a novel family of linear perfluoropolyethers (PFPEs) with optical absorbance at 157 nm between 0.3 and 0.6 cm(-1) in a broad range of compositions and molecular weights. The dependence of the optical threshold on the PFPE composition demonstrates that -OCF2- is the most transparent segmental unit in the VUV region.