Quantitation of silanol in silicones by FTIR spectroscopy

Griffith, G. W.

doi:10.1021/i300016a015

Cited by 28 publications

(15 citation statements)

References 2 publications

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“…Broad bands centered around 3458 and 1634 1/cm were attributed to stretching vibrations of surface hydroxyl groups and water (Wang et al, 2007) and to deformation vibration of adsorbed un-dissociated H 2 O molecules coordinated to surface centers (Morterra, 1988), Figure 6. Shoulder at 3685 1/cm in all spectra could be related to surface silanol groups (Griffith, 1984). Fig.…”

Section: Ftirmentioning

confidence: 79%

Improving platinum dispersion on SBA-15 by titania addition

Morales-Hernández¹,

Ujat²,

Pacheco-Sosa³

et al. 2019

Rev.Mex.Ing.Quim.

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Section: Ftirmentioning

confidence: 79%

Improving platinum dispersion on SBA-15 by titania addition

Morales-Hernández¹,

Ujat²,

Pacheco-Sosa³

et al. 2019

Rev.Mex.Ing.Quim.

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“…Post-irradiated A1 polymer exhibits all the peaks observed for pre-irradiated A1 polymer, except for the vibrational peaks at 3683 cm À1 corresponding to free silanol group of silicone polymer which is attributed to the X-ray induced oxidation, crosslinking or chain scission. 55,64,65 Similarly, Figure 5(b) shows the FTIR spectrum of pre-irradiated and postirradiated A3 nanocomposite which exhibits the characteristic peaks of polymer at 2965, 1593, 1269, 1107, 1019, 802, 681, and 606 cm À1 . It also exhibits the Gd─O vibrational peak at 545 cm À1 .…”

Section: Resultsmentioning

confidence: 98%

“…The FTIR spectrum of A1 exhibits the characteristic peaks of the polymer at 3683 cm À1 due to the presence of free silanol group and at 2967 and 2914 cm À1 corresponding to the asymmetric stretching of ─C─H in ─CH 3 . 55,56 The FTIR peaks at 1266 and 875 cm À1 are attributed to the stretching vibration of Si─CH 3.…”

Section: Resultsmentioning

confidence: 99%

Multifiller nanocomposites containing gadolinium oxide and bismuth nanoparticles with enhanced X‐ray attenuation property

Jayakumar

Mani

Saravanan

et al. 2021

J of Applied Polymer Sci

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We report here the development of multifiller nanocomposite containing gadolinium oxide and bismuth nanofillers with enhanced X-ray attenuation property. The mass attenuation coefficient of the nanocomposite is found to be 5.26 (X-ray attenuation: 95%) and 2.22 cm 2 /g (X-ray attenuation: 71%), respectively, under dental and lung X-ray scan conditions. Fourier transform infrared spectroscopy confirms the interfacial interaction between Gd 2 O 3 nanofillers and the polymer matrix through hydrogen bonding. Atomic force microscopy images of the nanocomposite show a smooth and uniform topography with an average surface roughness of~19 nm. Thermogravimetric analysis confirms the thermal stability of the nanocomposite upto 384 C. The enhanced X-ray attenuation property of the nanocomposite is attributed to the good interfacial bonding, dual k-edge effect of nanofillers and their uniform distribution within the polymeric matrix. Therefore, this nanocomposite is a promising material for diagnostic X-ray shielding, especially as, thyroid collar, gonad shield, aprons, gloves, and so on.

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“…These hydroxyls can be generally found in silicones and are: SiOH, carbinol (COH) and water (HO-H). These bands occur at 3642 (COH), 3700 (HOH) and 3763 (SiOH) cm1 [32] and are always present in silicones containing a siloxane chain (-Si-O-Si-). From Fig.…”

Section: Resultsmentioning

confidence: 99%

Severe graphene nanoplatelets aggregation as building block for the preparation of negative temperature coefficient and healable silicone rubber composites

Valentini

Bon

Pugno

2016

Composites Science and Technology

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With the request of higher performance in automotive products, sealing components and materials resisting to severe conditions, the performance requirements for silicones are becoming ever more diverse and sophisticated. In this article we prepared silicone rubber (SR)-graphene nanoplatelets (GNPs) composite via liquid mixing method; the mechanical strength of the GNPs estimated by applying quantized fracture mechanics suggested a severe GNPs agglomeration that was confirmed by scanning electron microscopy analysis. We observe that such SR/GNP composite behaves as a negative temperature coefficient material, exhibiting electrical resistance decrease with temperature increase. It was also shown how the damaged SR/GNP composite can be healed by simple thermal annealing. The healing mechanism was rationalized in terms of "living" reactive species that are not consumed by curing at room temperature and promote, when thermally activated, the crosslinking among the damaged network of oligomers. The healing efficiency, expressed as crack length vs. annealing temperature, has been estimated again applying the principles of quantized fracture mechanics. These results could satisfy many of the demanding requirements of the silicone rubber materials used in daily life and indicate that SR/GNP composites can act as healable and temperature sensor materials e. g. for seals, hoses and automotive sector.

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Quantitation of silanol in silicones by FTIR spectroscopy

Cited by 28 publications

References 2 publications

Improving platinum dispersion on SBA-15 by titania addition

Improving platinum dispersion on SBA-15 by titania addition

Multifiller nanocomposites containing gadolinium oxide and bismuth nanoparticles with enhanced X‐ray attenuation property

Severe graphene nanoplatelets aggregation as building block for the preparation of negative temperature coefficient and healable silicone rubber composites

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