Modification of the IR Spectra Shape in the 2000–2300 cm–1 Absorption Band upon the Aging of a Chemically Dehydrofluorinated Poly(vinylidene fluoride) Film

The Field-Effect Transistor Based on a Polyyne–Polyene Structure Obtained via PVDC Dehydrochlorination

“…As the Raman spectroscopy has finite analysis depth [45], a prominent variation between the spectra of precursor and the resulting material may indicate the subsurface layers of the polyyne-polyene being dehydrohalogenated better than deeper layers, thus confirming the studies of PVDF dehydrofluorination using similar techniquea [18]. The line at 2160 cm −1 is attributed to the vibration of sp-hybridized chains [37][38][39], while the lines at higher wavelengths of 2330, 2470, 2670, and 3070 cm −1 are related to the overtones of the discussed fundamental lines, corresponding to the second order of ν1 (denoted as 2×ν1), a weak overtone of ν1 and cis-ν1 (indicated as ν1+cis-ν1), an overtone of ν1 and ν2 (ν1+ν2), the second order of ν2 (2×ν2), respectively. The location of ν1 at 1160 cm −1 and ν1+cis-ν1 positioning at 2470 cm −1 indicates that the contribution of cis-ν1 is centered at approximately 1310 cm −1 , which is somewhat distant from the position of 1250 cm −1 observed for cis-polyacetylene [49], though, the position can be shifted to higher wavelengths for short and defected chain fragments.…”

“…The line at 2160-2170 cm −1 is attributed to the stretching vibrations of C≡C bonds [37][38][39]. Its emergence in the FTIR is related to the violation of the exclusion principle between Raman and FTIR spectra, which is typical for long-bended chains [40], while the observed peak position indicates that sp-hybridized fragments comprise a single C≡C bond [41].…”

Study of bearing strength for injection molded GFRPP composites under dry and wet conditions

“…All four mentioned peaks appeared in PP and GFRPP under dry, wet, and dried conditions. A group of peaks appeared in the region 2000-2300 cm -1 , It is known that the existence of those peaks is attributed to the stretching vibrations of triple carbon-carbon bonds (C≡C) 59 . For PP the peaks seemed to have higher marginal values in dry condition and lower values appeared for dried specimens while the lowest marginal value owed to wet specimens.…”

“…For PP the peaks seemed to have higher marginal values in dry condition and lower values appeared for dried specimens while the lowest marginal value owed to wet specimens. It is likely that the absorption of water leads to a gradual decrease in the intensity of radiation passing through the sample 59 . Compared to neat PP, the peaks' marginal values of dry, wet, and dried specimens in GFRPP are much closer to each other.…”

Resistive Gas Sensors Based on Porous Sp-Containing Films Obtained by Dehydrohalogenation of PVDC and PVDC-PVC Copolymer

“…The The spectrum of dh-PVDC (red line in Figure 3) shows relatively wide lines at 1160, 1560 and 2170 cm −1 . These lines are related to the vibrations of the C-C and of trans-isomeric polyenic structures [21], C=C of various carbon-based materials including disordered carbon and polyenes [8], and the vibrations of C≡C bonds [22][23][24], respectively. The plateau at 1210-1460 cm −1 is mainly attributed to the contribution of the D-line related to the breathing mode of sp 2 -hybridized clusters [25].…”