Abstract
Abstract Rubber blends are important materials in automotive industry, as well as in other sectors. However, there are implications when suitable use of a polymer in an artifact is not made. In the automotive area, for example, the use of an elastomer without the fuel resistance requirement would result in component degradation, potential fuel leakage, and danger of fire. The use of polymer blends may be the solution to this problem. Fourier transform infrared spectroscopy (FT-IR) can be used for the knowledge of the polymer content of these blends. Then, FT-IR quantitative methodologies for determining acrylonitrile-butadiene copolymer (NBR) copolymer and butadiene-styrene copolymer (SBR) contents were developed by the transflectance accessory, NIRA, and the transmission mode, being the sample analyzed by transmission and universal attenuated total reflection (UATR) in the medium infrared (MIR). UATR and NIRA methodologies showed better accuracy. However, the MIR analysis showed a detection limit between 10-20% of NBR.
Highlights
In contrast to the deceleration in the new polymersThere are several blends available in the world market, production, there is a growing interest in the processes but for the purpose of this paper, the blend composed of NBR research and development for the modification of existing and SBR copolymers was selected based on its properties polymers[1]
The samples were analyzed in Spectrum One PERKINELMER Fourier transform infrared spectroscopy (FT-IR) spectrometer (MIR regions of 4000 to 400 cm-1 and NIR of 12000 to 4000 cm-1, 4 cm-1 resolutions, gain 1, 20 scans), being spectra obtained by transmission techniques (MIR and NIR) and reflection (MIR), using the universal attenuated total reflection (UATR) accessory, and in NIR region, using the Frontier PERKINELMER FT-IR spectrometer, NIRA accessory, being all samples of different methodologies, prepared by pyrolysis in Bunsen burner
In this topic the following were addressed: a) the determination by UATR of AN content of NBR used in the blends, according to methodology previously developed by the group[9], since only one range was furnished by the supplier
Summary
There are several blends available in the world market, production, there is a growing interest in the processes but for the purpose of this paper, the blend composed of NBR research and development for the modification of existing and SBR copolymers was selected based on its properties polymers[1]. Butadiene is a monomer used in the NBR rubber benefits aeronautics industry on manufacture of elastomers of great economic interest appliances as such hoses, seals, and self-sealing fuel and oil worldwide According to their properties, the polymers are tanks. FT-IR transmission and reflection (UATR) techniques[9] were used for determining contents up to around 50%, with good results, indicating that UATR methodology presents better linear correlation and less analysis time. FT-MIR Analysis (medium infrared) and FT-NIR (near the relative error of methodology was compared infrared) were used to NBR/SBR determination. Determination of acrylonitrile (AN) content in NBR Cast film technique involves solvent use, elaborated gum (without additives) by FT-IR transmission/cast film, sample preparation, and there may be interference with reference values obtained by the Kjeldhal method, associated with the solvent/polymer interaction, and measuring contents up to around 40%. The samples were prepared by pyrolysis in a Bunsen burner, with evaluation of FT-IR methodology error
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