Papers by Keyword: FTIR Spectra

Abstract: Composite of polyaniline-MgCl has been synthesized using oxidative polymerization method. Synthesized samples were characterized for structural analysis using FTIR and XRD. Morphological studies were carried by SEM micrographs. Current-Voltage (I-V) properties are obtained through Kiethly source meter. FTIR spectrum of polyaniline-MgCl composite indicates all the characteristic peaks of polyaniline. X-ray diffraction patterns represented the amorphous nature of polyaniline-MgCl composite. SEM micrographs confirmed the presence of MgCl particles in polyaniline matrix. I-V characteristics have shown the ohmic type behavior of polyaniline and polyaniline-MgCl composite.

Abstract: Polyurethane (PU) adhesives were prepared from three different polyols based on polycaprolactone (PCL)/palm kernel oil (PKO) with an aromatic and cycloaliphatic diisocyanate. The adhesives were characterized through Fourier Transformer Infrared (FTIR) spectroscopy in order to ensure the formation of urethane and the completeness of polymer reaction. The effects of NCO/OH ratios and types of diisocyanate on PU adhesive strength were investigated. The adhesive strength of metal to metal bonding was determined by single lap shear joint testing. The correlation between crosslinking of PU network and adhesive strength was also studied by performing swelling tests.

Abstract: Molecular imprinting technology is a convenient approach for preparing synthetic receptors that possesses user defined recognition properties. Oxalic acid imprinted bulk polymer was synthesized by thermal initiated free radical co-polymerization of oxalic acid (template) with two different functional monomers (acrylamide and methacrylic acid) and ethylene glycol dimethacrylate as crosslinker, using acetonitrile (porogen) as solvent. Scanning electron microscopy and FT-IR spectra confirmed the formation of molecularly imprinted polymer (MIP) with acrylamide. The synthesized MIP_(ACR) efficiently adsorbed oxalic acid from aqueous solutions. The binding parameters of molecularly imprinted polymer and non-imprinted polymer were compared by Langmuir-Freundlich adsorption (LF) isotherm.

Abstract: The Aim of this Work Is to Investigate Role of Iron in Calcium-Iron-Phosphate Bioglass. the Density, Compressive Strength, Tg Point and Leachability of Cations Were Measured. the Ph Behaviour of Simulated Body Fluid after Soaking Phosphate Glasses for Different Time Periods Were Also Studied and it Was Observed that Higher Phosphate Glasses Containing Lower Lime Possessed Better Bioactivity than Lower Phosphate Glasses Containing More Iron and Lime Contents. the DTA and FTIR Spectrometry of Glasses Were Performed. the Absorption Spectra Showed that Iron Was Present in the Glass only as Fe3+ Ion. the Leachability of Ca2+ and Fe3+ Ions from Glass Was due to Diffusion Control and P5+ Ion due to Network Break down of PO4 Tetrahedra. the DTA Peaks Were Broad. the FTIR Band around 1000 Cm-1 in Glass Was due to Asymmetric Stretching of O=P=O Linkage. the FTIR Absorption and Reflectance Spectrometry of the Glass Samples after SBF Treatment Had Confirmed the Deposition of Bone-Like Hydroxyl Carbonate Apatite Layer on the Glass Surfaces for their Bioactivity. the Bands Centred in between 2880-3425 Cm-1 Were due to Presence of OH Groups and Stretching Modes of H-O-H Vibration in Glasses. the Properties and Structure Relationship for Glasses Were Established and the Results Were Discussed.

Abstract: _{Subscript textSubscript text}Epoxy resins have been widely used for inner coating in food can and other chemical products storage containers. Differential scanning calorimetry (DSC) was used at different heating rates to study the cure kinetics of the diglycidyl ether of bisphenol A (DGEBA) with a methanol etherified amino resin (MEAR). The apparent activation energy derived from Kissinger and Ozawa methods is 35.67KJ/mol and 40.27kJ/mol, respectively. The reaction order evaluated by Crane equation is 0. 95 and the frequency factor is 1.12×10⁴s^-1. Reaction mechanism was monitored by FTIR spectra of the reaction mixtures before and after curing. The curing reaction below 200°C is between alkoxylmethyl (>NCH₂OCH₃) and epoxide group, not between alkoxylmethyl and hydroxyls.