A highly porous film composed of a three-dimensional network multi-walled carbon nanotube (MWCNT), also known as buckypaper (BP), was prepared by vacuum filtration well-dispersed suspension MWCNT/H20 with the aid Triton X-100 surfactant. The key contribution this work is to achieve best parameters during preparation and find way remove excess triton from network. stability in different pH, adsorption capacity, reusability MWCNT evaluated. effects ultrasound on BP properties were...

Abstract Fourier transform‐infrared spectroscopy (FT‐IR) in transmission and photoacoustic detection (PAS) techniques have been used for the characterization of polymeric coating cyclotrimethylenetrinitramine (RDX) using a fluoroelastomer (Viton ® ). Although bands polymer were indicated by two different techniques, (casting film) showed better evidence absorption energetic material. Also attenuated total reflectance (ATR), another FT‐IR technique, has to analyze cyclotetramethylenetetramine...

Phenolic resin has long been used as matrix for composites mainly because of its flame retardant behavior and high char yield after pyrolysis, which results in a self supporting structure.The addition ceramic powders, such SiC B 4 C, fillers to the phenolic resin, better thermo-oxidative stability, but drawbacks, it poor homogeneity, adhesion processing difficulties during molding composites.The single elements, boron, silicon phosphorus main backbone thermo-set is new strategy obtain...

Abstract Background Even though dermatologists often perform drug delivery procedures, it is necessary to assess their safety. Objective Quantify the amount of medication delivered using MMP technique and outline other safety parameters. Methods Using a simple novel technique, we attempted quantify by weighing human skin samples before after delivery. Results In done on liquid with density 1,271,460 μ g/ml (the values expressed in this manuscript are µg), needling 570 perforations/cm 2 ,...

It is very important to control the characteristics of a polymer used in rubber compositions and paints aerospace applications. Hence, development simple fast methodologies that allow identification these becomes attractive researches carried out this area. This study has evaluated infrared (IR) techniques, such as transmission, universal attenuated total reflection (UATR), (ATR), for characterization elastomers paints. takes into consideration surface depth penetration IR beam sample. The...

In this study, Fourier transform infrared spectroscopy (FT-IR) was employed to investigate the gaseous pyrolysis products of ethylene-propylene-diene rubber (EPDM).The objective evaluate potential FT-IR analysis pyrolyzates (PY-G/FT-IR) for characterization EPDM additives.Two formulations, containing additives typically in rubbers, were analyzed.Initially, from paraffin oil, stearic acid, 2,2,4-trimethyl-1,2-dihydroquinoline, tetramethylthiuram monosulfide (TMTM), disulfide (TMTD), and...

When using Fourier transform infrared spectroscopy (FT-IR) under the qualitative aspect for characterization of polymer blends, often a simple identification each one existing polymers in blend does not justify material failure since different amounts component may result mechanical properties, which should be possible cause when applied to an automotive part. Thus, seeking better justification understanding analysis, new quantitative FT-IR methodology was developed mid-infrared region...

Samples of epoxy resin (EP) based on the diglycidyl ether bisphenol A (DGEBA), cured with nadic methyl anhydride (NMA) and mercaptan (CAPCURE 3-800), or amine-phenol EH-30), respectively, SE 4 5, were prepared in stoichiometric ratio determined by supplier. The curing behaviour systems 5 was followed DSC (Differential Scanning Calorimetry). These their ingredients analyzed using FTIR transmission techniques (KBr pellets, pyrolysis without control controlled pyrolysis-FT-IR, CONTROLPIR/FT-IR)...

The main objective of these studies was the synthesis and characterization new energetic binders their use in some propellant formulations.Following working plan elaborated, following compounds has been done successfully:The scale up for copolymer GAP/PolyBAMO PolyBAMO using GAP as initiator they were fully characterized by IR, ( 1 H, 13 C) NMR-spectroscopy, GPC, elemental analysis, OH-functionality, differential scanning calorimetry (DSC) sensitivity tests (friction, impact).For this two...

Thermal aging of hydroxy-terminated polybutadiene/isophorone diisocyanate (HTPB/IPDI)-based polyurethane was studied as a function NCO/OH ratio (1.0 and 0.85). Samples were aged in air ovens at 50, 60, 65, 70 ºC for periods time from 1 to 34 weeks. Changes chemical (swelling testing FT-IR spectroscopy) mechanical (tension hardness) properties evaluated throughout the assays. Correlation between equilibrium swelling elastic modulus, coupled with changes spectra, indicated oxidative...

Polyacrylonitrile (PAN) was solubilized in N,N-dimethyl formamide (DMF) and the electrospinning process has been employed to obtain PAN nanofibers (PF). Multiwalled carbon nanotubes (MWCNT) were dispersed with aid of Triton X-100 surfactant subsequently centrifugated. Buckypapers (BP/PF) prepared by vacuum filtration procedure MWCNT suspension supernatant stacking four PF layers over a nylon membrane. The removal carried out immersing BP/PF system DMF periods 10 30 min evaluated. Scanning...

A new method has been developed for determining the content of mixtures octahydro-1,3,5,7-tetranitro-1,3,5,7-tetrazocine (HMX) and hexahydro-1,3,5-trinitro-1,3,5-triazine (RDX), HMX/RDX ratio, in explosive compositions by Fourier transform infrared spectroscopy (FT-IR), regions MIR (mid infrared) NIR (near with reference values obtained chromatographic analysis (HPLC). Plots relative (A917 / A783) or absorbance (A4412 A4317) versus ratio determined HPLC revealed good linear relationships.

The Journal of Aerospace Technology and Management is a techno-scientific publication serialized, edited, published by the Institute Aeronautics Space (Instituto de Aeronáutica e Espaço-IAE).

Carbon fibers have been widely used as structural reinforcement in aeronautical composites, because of their exceptional mechanical properties.However, carbon present few polar groups on surfaces inducing a weak interaction with some thermosetting and thermoplastic matrices.Surface treatments, such thermal electrochemical oxidation, are generally followed by sizing order to improve interfacial adhesion between matrices.The precise surface characterization, means its chemical radical...

Abstract The primary amine content in tetraethylenepentamine (TEPA) and TEPAN, a bonding agent used composite solid propellants, was determined by near infrared (NIR) spectroscopy the results were compared to those obtained potentiometry. band at 4930 cm −1 , which showed be influenced only groups, chosen as analytical band. calibration curves based on isopropylamine (IPA) isopropylamine/dibutylamine (IPA/DBA) mixtures proved suitable for determining NH 2 of TEPA or samples containing...

Epoxy systems are widely applied as adhesives in the aerospace industry. They have excellent adhesion properties, however, being thermosetting, epoxy show fracture brittleness characteristics. Polysulfide and polymercaptans good options to increase flexibility of adhesive. Thermal analysis techniques generally used evaluate curing degree systems. In most cases, when infrared (IR) is used, it employed qualitatively. This paper presents reaction study a DGEBA prepolymer with diethylenetriamine...

Um estudo comparativo envolvendo técnicas de análise por espectroscopia no infravermelho com transformada Fourier (FTIR) transmissão, reflexão e fotoacústica é apresentado poliamida-6. O potencial as limitações destes métodos são investigados para analisar alterações espectrométricas que ocorrem interior na superfície da poliamida-6, reciclada, irradiada presença oxigênio, feixe elétrons 1,5 MeV, dose 500 kGy. As mostram-se sensíveis detectar pequenas mudanças estruturas poliamida-6...

A new methodology was developed to characterize and quantify the polymer content in PBX (HMX/Viton) by Fourier Transform Infrared Spectroscopy (FT-IR), using Termogravimetric analysis (TG) as reference techniques for quantitative method.The quantification methodology, proposed us, transform infraredattenuated total reflectance (FT-IR/ATR) showed excellent results, being faster than usual methodologies can eliminate generation of chemical residues.

Abstract In this study, we investigated the application of luminescence spectroscopy technique in steady‐state conditions to study glass fiber‐epoxy F161 prepregs. We conducted by comparing results obtained from intrinsic fluorescence with Fourier transform near infrared spectroscopy. The extrinsic 9‐anthroic acid (9‐AA) was also used. used characterize epoxide resin. prepregs containing 9‐AA and those that did not were heat‐treated at 177°C (F161) for 1100 min a 2°C/min heating rate. both...

Rubber blends are important materials in automotive industry, as well other sectors. However, there implications when suitable use of a polymer an artifact is not made. In the area, for example, elastomer without fuel resistance requirement would result component degradation, potential leakage, and danger fire. The may be solution to this problem. Fourier transform infrared spectroscopy (FT-IR) can used knowledge content these blends. Then, FT-IR quantitative methodologies determining...

Ethylene-propylene-diene elastomer (EPDM) is employed as thermal insulation for rocket motors, well EPDM blends with ethylene vinyl acetate (EVA) have been used in the aerospace industry.The quantifi cation of these more common using Fourier Transform Infrared Spectrometry (FT-IR) by transmission mode, but without discussing sample preparation and methodology error.Considering this fact, a was developed determining EVA content binary blend samples, Universal Attenuated Total Refl ection...

Conjugation of photosensitizers (PS) with nanoparticles has been largely used as a strategy to stabilize PS in the biological medium resulting photosensitizing enhanced photoactivity. Herein, (Meso-5, 10, 15, 20-tetrakis (3-hydroxyphenyl) phorphyryn (mTHPP) was conjugated diamond (ND) by covalent bond. Nanoconjugate ND-mTHPP showed suitable stability aqueous suspension 58 nm hydrodynamic diameter and Zeta potential −23 mV. The antibacterial activity evaluated against Escherichia coli for...