Infrared spectral investigation of the linseed oil polymerization in a corona discharge in air at atmospheric pressure

Abstract

In this paper we have demonstrated that the negative and positive corona discharge in air at atmospheric pressure is a convenient physical method for the initiation of the high-reaction-rate polymerization process of the linseed oil. The different stages of the polymerization process were investigated by infrared (IR) spectroscopy and the formation of the linseed oil polymer was evaluated by the presence of the C-O-C bands.

Reduced energy bandgap of a-Si:H films deposited by PECVD at elevating temperatures

“…All the spectra look similar with respect to their patterns and monotonic intensities, depending on the subtrate temperatures during deposition. According to literatures [5][6][7][8][9][10][11], in the range of wavenumber between 600 -2100 cm -1 , the absorbtion peaks (valeys in the spectra) are associated with the modes of respectively Si-H wagging, S-H3 bending and S-H stretching. The functional group mode of SiO2 (cristobalite) is also observed in the spectra, which probably comes from the substrate made the glass.…”

Physicochemical Analysis of the Polydimethylsiloxane Interlayer Influence on a Hydroxyapatite Doped with Silver Coating

“…The PDMS layers have been generated in atmospheric air pressure corona discharges starting from liquid precursors of vinyl terminated polydimethylsiloxane. The method and the experimental conditions used for the deposition of thin PDMS layers (with an average thickness in the hundred nanometers range) on metallic substrates were presented in detail in [8,9].…”

“…As we increase the angle of incident light on the sample up to 60 ∘ , it can be observed that the band from 1152 cm −1 increases and the band from 860 cm −1 decreases appearing like a shoulder on the new 880 cm −1 band. The increase of the intensities of the 1152 cm −1 and 880 cm −1 IR bands accompanied by the decrease of 860 cm −1 IR band can be understood knowing that, during the polymerization process of PDMS in negative corona discharge, the formation of the new Si-O bonds due to the injection of the negative ions in the liquid precursor bulk is associated with the diminishing of Si-CH 3 bonds [9,53]. Thus, in the polymer layer bulk, mainly at the polymer layer surface SiO 2 structures [9] can be generated.…”

“…Hydroxyapatite (HAp, Ca 10 (PO 4 ) 6 (OH) 2 ) is a biomaterial with a wide range of applications in medicine due to its biocompatibility, bioactivity, and osteoconductivity [1][2][3][4]. Hydroxyapatite has been used to fill a wide range of bony defects in orthopedic and maxillofacial surgeries and dentistry [5][6][7][8]. It has also been widely used as a coating for metallic prostheses to improve their biological properties [9][10][11].…”

In Situ Disassembling Behavior of Composite Hydrogels for the Efficient Removal of Crystal Violet Dye from Aqueous Solution

“…The sharp peak at 1100 cm −1 with white ash shows the Si-O-Si bond. The sharpness helps to distinguish it from Si-C-Si band [27,28]. The sharp band at 3420 cm −1 shows the stretching Si-OH bond that is hydrogen bonded and not free Si-OH bond.…”