Extinction Coefficient Determination of Polymeric Materials and Their Use in the Optical Characterization of Infrared Microscopes: A Preliminary Investigation into Quantitative Infrared Microspectroscopy

2002 ◽  
Vol 56 (11) ◽  
pp. 1397-1402 ◽  
Author(s):  
Louis G. Tisinger ◽  
André J. Sommer
Keyword(s):  
Preliminary Investigation ◽  
Polymeric Materials ◽  
Infrared Microspectroscopy ◽  
Poly Ethylene Terephthalate ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Sample Configuration ◽  
Ft Ir Spectroscopy

A comparison of infrared spectra collected in both a macro sample configuration and on a microscope accessory was conducted. The results of this comparison demonstrated that as the microscope aperture was reduced, absorbance values increased for a given polymer film by as much as 33% as compared to the same data collected in the corresponding macro experiment. A detailed evaluation of the optical pathlength for both the micro and macro configurations was conducted. Results of this evaluation and that of detector non-linearity showed that the latter effect was most problematic. During the course of the investigation the average angle of light traversing through the objective was determined for several infrared microscopes. Further analysis indicated that changing the aperture size of the microscope can have significant influence on the absorbance values obtained. In addition, extinction coefficients of poly(methyl methacrylate), polystyrene, poly(vinyl acetate), polycarbonate, and poly(ethylene terephthalate) were determined using macro FT-IR spectroscopy.

Characterization of Geopolymer Materials Containing MSWI Fly Ash and Coal Fly Ash

2010 ◽  
Vol 69 ◽  
pp. 123-128 ◽  
Author(s):  
Salvatore Andini ◽  
Raffaele Cioffi ◽  
Francesco Colangelo ◽  
Claudio Ferone ◽  
Fabio Montagnaro ◽  
...  
Keyword(s):  
Fly Ash ◽  
Coal Fly Ash ◽  
Mswi Fly Ash ◽  
Three Samples ◽  
Chemical Behaviour ◽  
Ft Ir ◽  
Ft Ir Spectroscopy ◽  
Polycondensation Products

In this work three samples of MSWI ash have been stabilized in systems containing coal fly ash and able to give geopolymers through a polycondensation reaction. Monolithic products were obtained with both MSWI ashes as received and after chloride partial removal by water washing. The polycondensation products have been characterized qualitatively by means of FT-IR spectroscopy and scanning electron microscopy (SEM) and quantitatively through the determination of the amount of reacted water and silicate. Differently from traditional cement based stabilization systems, those based on geopolymerization show a chemical behaviour almost insensitive to the presence of chlorides and sulphates in the MSWI ash. On the other hand, the microstructure is strongly affected by the content of soluble salts.

Amplitude Spectrum Approach in Dynamic FT-IR Spectroscopy of Uniaxially Oriented Poly(Ethylene Terephthalate) Films. Part I: Draw Ratio Dependence

1997 ◽  
Vol 51 (3) ◽  
pp. 346-349 ◽  
Author(s):  
Masashi Sonoyama ◽  
Kunihiro Shoda ◽  
Gen Katagiri ◽  
Hideyuki Ishida
Keyword(s):  
Structural Changes ◽  
Ethylene Terephthalate ◽  
Amplitude Spectrum ◽  
Data Manipulation ◽  
Poly Ethylene Terephthalate ◽  
Ft Ir ◽  
Poly Ethylene ◽  
Mechanical Stretching ◽  
Methylene Group ◽  
Ft Ir Spectroscopy

A method of data manipulation using the dynamic magnitude spectrum and the static absorbance spectrum is applied to uniaxially drawn poly(ethylene terephthalate) films with five different draw ratios for the evaluation of the amplitude of dynamic structural changes under a sinusoidal strain at the level of a functional group. This analysis revealed that, in the drawn film, the skeletal structures, such as the C–O bond in the ethylene glycol unit and the phenyl ring, are susceptible to deformation by mechanical stretching, while the dynamic structural changes around the methylene group are small. It was assumed that the backbone of the polymer is responsible for the change of the mechanical properties induced by the drawing of the film.

Synthesis of Allyl Pentaerythritol Crosslinker based Polymer Hydrogels and Determination of the Crosslink Density

2021 ◽  
Vol 25 (11) ◽  
pp. 138-142
Author(s):  
Anamica . ◽  
Poorn Prakash Pande
Keyword(s):  
Crosslink Density ◽  
Metal Removal ◽  
Heavy Metal Removal ◽  
Polymer Gels ◽  
Polymer Hydrogels ◽  
Swelling Capacity ◽  
Ft Ir ◽  
Ft Ir Spectroscopy

In this study, we report the synthesis and characterization of polymer hydrogels. The polymer gels have been prepared from acrylic acid (AA) monomer using allyl pentaerythritol as the crosslinker in the presence of potassium persulfate initiator. The synthesized polymer gels have been characterized by Fourier-transform infrared (FT-IR) spectroscopy. The swelling capacity and crosslink density of the synthesized polymer gels have been determined and it was found that some of the polymer samples behave like super-absorbent polymers. These polymeric-gels can be utilized in various applications viz. as a catalyst for dye removal, for anion removal from water and for heavy metal removal etc.

scholarly journals Multicomponent Materials to Improve Solubility: Eutectics of Drug Aminoglutethimide

Crystals ◽  
2021 ◽  
Vol 12 (1) ◽  
pp. 40
Author(s):  
Basanta Saikia ◽  
Andreas Seidel-Morgenstern ◽  
Heike Lorenz
Keyword(s):  
Melting Point ◽  
Molar Ratio ◽  
Experimental Characterization ◽  
X Ray ◽  
Eutectic Mixtures ◽  
Ft Ir ◽  
Aqueous Solubilities ◽  
Ft Ir Spectroscopy

Here, we report the synthesis and experimental characterization of three drug-drug eutectic mixtures of drug aminoglutethimide (AMG) with caffeine (CAF), nicotinamide (NIC) and ethenzamide (ZMD). The eutectic mixtures i.e., AMG-CAF (1:0.4, molar ratio), AMG-NIC (1:1.9, molar ratio) and AMG-ZMD (1:1.4, molar ratio) demonstrate significant melting point depressions ranging from 99.2 to 127.2 °C compared to the melting point of the drug AMG (151 °C) and also show moderately higher aqueous solubilities than that of the AMG. The results presented include the determination of the binary melt phase diagrams and accompanying analytical characterization via X-ray powder diffraction, FT-IR spectroscopy and scanning electron microscopy.

scholarly journals Multicomponent Materials to Improve Solubility: Eutectics of Drug Aminoglutethimide

2021 ◽  
Author(s):  
Basanta Saikia ◽  
Andreas Seidel-Morgenstern ◽  
Heike Lorenz
Keyword(s):  
Melting Point ◽  
Experimental Characterization ◽  
Analytical Characterization ◽  
X Ray ◽  
Eutectic Mixtures ◽  
Ft Ir ◽  
Aqueous Solubilities ◽  
Ft Ir Spectroscopy

Here, we report the synthesis and experimental characterization of three drug-drug eutectic mixtures of drug aminoglutethimide (AMG) with caffeine (CAF), nicotinamide (NIC) and ethenzamide (ZMD). The eutectic mixtures (AMG-CAF, AMG-NIC and AMG-ZMD) demonstrate significant melting point depressions ranging from 99.2 to 127.2 °C compared to the melting point of the drug AMG (151°C) and also show significantly higher aqueous solubilities than that of the AMG. The results presented include the determination of the binary melt phase diagrams and accompanying analytical characterization via X-ray powder diffraction, FT-IR spectroscopy and Scanning electron microscopy.

Synthesis and characterization of a poly(ether-ester) copolymer from poly(2,6 dimethyl-1,4-phenylene oxide) and poly(ethylene terephthalate)

2005 ◽  
Vol 99 (5) ◽  
pp. 2124-2131 ◽  
Author(s):  
B. García-Gaitán ◽  
M. del P. Pérez-González ◽  
M. C. Zárate-Acevedo ◽  
A. Martínez-Richa ◽  
G. Luna-Bárcenas ◽  
...  
Keyword(s):  
Ethylene Terephthalate ◽  
Synthesis And Characterization ◽  
Phenylene Oxide ◽  
Poly Ethylene Terephthalate ◽  
Poly Ethylene ◽  
Ether Ester
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