Spectroscopic studies and first-principles modelling of 2,2,4-trifluoro-5-trifluoromethoxy-1,3-dioxole (TTD) and TTD–TFE copolymers (Hyflon® AD)

Chemical modification of Hyflon® AD copolymer end groups by means of physical and chemical treatments. A joint spectroscopic and quantum chemical investigation

“…It was indeed demonstrated in previous papers [15][16][17][18][19][20] that such a joint experimental/computational investigation allows to obtain an in-depth description of the structural and vibrational properties of perfluorinated polymers, unraveling both the intra-and intermolecular phenomena which are responsible for their physicochemical properties.…”

“…As described in Ref. [15], they should give relevant information regarding the molar ratio between TFE and Dioxole units: the fact that no significant differences were observed in the spectral data indicates that the amount of reacted dioxole units is below the detection limit of the Raman analysis.…”

“…For each of them we carried out geometry optimization and IR spectra calculation runs. In the case of systems possessing a flexible backbone, the conformational space was explored as successfully done in the past [15][16][17][18][19] on similar systems, in order to take into account the contribution of all the relevant conformers. The resulting average values of frequency and IR intensity were calculated and reported in Table 1.…”

“…Also, chain branching, variation of the conformational order/disorder parameter or of the crystallinity degree are expected [11][12][13]. More recently, similar studies have been conducted on amorphous perfluoropolymers as well [14][15].…”

New amorphous perfluoro polymers: perfluorodioxolane polymers for use as plastic optical fibers and gas separation membranes

“…Hence, light is scattered, and it has poor optical transparency. New classes of amorphous perfluorinated polymers with extraordinary properties were developed and commercialized by DuPont (as Teflon® AF), Asahi Glass (as Cytop®), and Solvay (as Hyflon® AD) . Teflon® AF and Hyflon® AD are a family of copolymers of 2,2‐bis(trifluoromethyl)‐4,5‐difluoro‐1,3‐dioxole and 2,2,4‐trifluoro‐5‐trifluoromethoxy‐1,3‐dioxole with TFE, respectively (Fig.…”