Infrared Spectroscopy Applied to Materials Used as Thermal Insulation and Coatings

Abstract

It is very important to control the characteristics of a polymer used in rubber compositions and paints in aerospace applications. Hence, the development of simple and fast methodologies that allow the identification of these compositions becomes attractive to researches carried out in this area. This study has evaluated infrared (IR) techniques, such as transmission, universal attenuated total reflection (UATR), and attenuated total reflection (ATR), for the characterization of elastomers and paints. It takes into consideration the characteristics of surface techniques, such as the depth of penetration of the IR beam into the sample. The presence of additives in low concentrations on paints was only detected by UATR after grinding the components. Results show that it is possible to differentiate rubber mixtures with similar IR spectra and to detect small amounts of additives in the surface of coatings.

Evaluation of elastomeric heat shielding materials as insulators for solid propellant rocket motors: A short review

“…Overall, revisiting knowledge constitutes a road mark for future developments on specialty polymers and nanocomposites. This short review aims to impulse research on high-temperature resistant composites made from commonly available materials [119,120]. For example, fumed silica is used as filler in EHSM and common additive in industry and presents the same level of thermal conductivity of super critically dried aerogels.…”

Fourier Transform Infrared Spectroscopy and Scanning Electron Microscopy Characterization of Adhesive Produced From Polystyrene Waste

“…Two peaks were located between 1500-1250 cm -1 at (1435.09, 1388.79) C-C stretching (in-ring) assigned to the aromatics functional group [7,12]. From the ranges of 1500-400 cm -1 is the fingerprint region [13], where three peaks were located in the range of 1250-1000 cm -1 with absorbance at (1111.03 and 1057.03) cm -1 assign to C-N stretching vibrations band of aliphatic amines with sharp bends at 1057.03 cm -1 absorbances and 871.85 cm -1 peaks was assign for primary, secondary amines and aromatic N-H wag and C-H located between 1000-750 cm -1 [24,7,28].…”

“…Three peaks were located in the range of 4000-3500 with the absorbance at (3896.34, 3703.45 and 3610.86) cm -1 corresponding to O-H band stretching vibrations with free hydroxyl group usually assigning to alcohols and phenols [17], which could be due to the additives in the formulation. Four peaks were located in the range 3500-3000 cm -1 with absorbance at (3402.54, 3286.81, 3209.66 and 3132.50) assign to N-H stretching vibrations presence of amines functional group due to the presence of diphenyl amines [24,25]. Four peaks were located in the region 3000-2500 cm -1 with absorbance at (2955.04, 2877.89, 2746.73 and 2530.69) cm -1 vibrations assign to O-H stretching usually for carboxylic acid region, H-C=O:C-H stretching assign to aldehydes region and C-H stretching alkanes revealed presence of saturated hydrocarbon produced from the oxidation of aldehydes [28,13].…”

“…Fourier transforms infrared (FT-IR) spectra instrument has been used to study the existence of different compounds in a mixture [24]. It is the ideal process of identification and analyzing chemical components in unknown materials, qualitatively or consistency of samples and amount of components in a mixture [4].…”

Separação e identificação de aditivos em tinta por TLC-IR/ UATR e extração seletiva

“…Uma técnica que têm encontrado destaque na análise de diferentes materiais, em comparação às técnicas de transmissão é a reflexão total atenuada universal (UATR) [18] . UATR é capaz de realizar a análise não destrutiva de sólidos, pós, líquidos e géis, bem como no estudo de tintas, na análise qualitativa e quantitativa de polímeros [19] .…”