Characterization of Spin on Glass Using Thermo Analytical Techniques and Ftir Spectroscopy

1990 ◽  
Vol 204 ◽  
Author(s):  
M. Speciale ◽  
C. La Rosa ◽  
D. Grasso ◽  
A. Porto ◽  
P. Lanza ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ftir Spectroscopy ◽  
Analytical Techniques ◽  
Experimental Results ◽  
Thermal Treatments ◽  
Cross Polarization ◽  
Scanning Calorimetry ◽  
Thermoanalytical Techniques ◽  
Different Temperatures

ABSTRACTThe curing of a commercial ethoxymethyl-phosphosiloxane at different temperatures and under various gas ambients was characterised using NMR, thermoanalytical techniques, and FTIR spectroscopy. DSC (Differential Scanning Calorimetry) and DTG (Differential Thermo Gravimetry) were employed to characterize the reactions that occur during thermal treatments in O2 or N2 atmospheres. FTIR spectroscopy and CP (Cross Polarization) 133C - NMR were used to detect the presence of the hydroxyl and organic groups in the cured samples. The experimental results identified three different temperatures (400,580,700°C) that define important stages of the curing reaction. In particular, for annealing at temperatuires up to 580°C in 02, DSC, DTG and FTIR spectra showed the elimination of the organic groups. However, when the annealing was carried out in N2 up to 700°C, these groups are retained.

scholarly journals Characterization of S-layer proteins of Lactobacillus by FTIR spectroscopy and differential scanning calorimetry

2009 ◽  
Vol 50 (1) ◽  
pp. 68-77 ◽  
Author(s):  
P. Mobili ◽  
A. Londero ◽  
T.M.R. Maria ◽  
M.E.S. Eusébio ◽  
G.L. De Antoni ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Ftir Spectroscopy ◽  
Scanning Calorimetry

Studies of Elastomer Oxidation via Thermal Analysis

1999 ◽  
Vol 72 (1) ◽  
pp. 165-173 ◽  
Author(s):  
D. J. Burlett
Keyword(s):  
Thermal Analysis ◽  
Differential Scanning Calorimetry ◽  
Oxidation Process ◽  
Industrial Applications ◽  
Scanning Calorimetry ◽  
Thermoanalytical Techniques ◽  
The Stability ◽  
Induction Times ◽  
Oxidation Susceptibility

Abstract Elastomers are used in many industrial applications because of their remarkable toughness and elasticity. However, the source of these properties is also a weakness, in that loss of properties via oxidation is an important factor in their selection. Thermoanalytical techniques, such as differential scanning calorimetry (DSC), provide useful tools for the characterization of the stability of elastomers. DSC can not only be used to determine oxidative induction times under isothermal conditions but can also be used to determine apparent overall activation energies of the oxidation process. An evaluation of these techniques is made and the technique is used to compare the oxidation susceptibility of polybutadienes of different microstructure. The results of these DSC scans are interpreted in terms of the chemistry of the oxidation process using FTIR results.

scholarly journals Extraction and Characterization of Galactan from Seaweed Gracilaria verrucosa of Vietnam 

2021 ◽  
Vol 31 (1) ◽  
pp. 73-77
Keyword(s):  
Differential Scanning Calorimetry ◽  
Infrared Spectroscopy ◽  
Thermal Resistance ◽  
Gracilaria Verrucosa ◽  
Structure And Properties ◽  
Scanning Calorimetry ◽  
Different Temperatures ◽  
Kjeldahl Method ◽  
Viscosity Determination

In this study, we extracted galactan from the seaweed Gracilaria verrucosa of Vietnam and investigated its structure and properties. The seaweed was immersed in water in the different temperatures to obtain the solution of galactan. Thereafter, the solution was coagulated and purified to obtain galactan as a powder. Kjeldahl method, infrared spectroscopy, viscosity determination and differential scanning calorimetry (DSC) were used to characterize structure and properties of the resulting material. It was found that the obtained galactan had agar structure without sulfate as substitute group. The proteins content, the intrinsic viscosity and the thermal resistance of the galactan extracted in water at 40 oC were higher than those of the galactan extracted in water at 100 oC.

Gelatin and Glycerine-Based Bioadhesive Vaginal Hydrogel

2020 ◽  
Vol 17 (4) ◽  
pp. 303-311
Author(s):  
Roberta Cassano ◽  
Federica Curcio ◽  
Delia Mandracchia ◽  
Adriana Trapani ◽  
Sonia Trombino
Keyword(s):  
Differential Scanning Calorimetry ◽  
Inflammatory Process ◽  
Vaginal Mucosa ◽  
Vaginal Infection ◽  
Scanning Calorimetry ◽  
Time Intervals ◽  
Site Specific ◽  
Release Studies ◽  
Hiv Seropositive

Aim: The work’s aim was the preparation and characterization of a hydrogel based on gelatin and glycerine, useful for site-specific release of benzydamine, an anti-inflammatory drug, able to attenuate the inflammatory process typical of the vaginal infection. Objective: The obtained hydrogel has been characterized by Electronic Scanning Microscopy (SEM) and Differential Scanning Calorimetry (DSC). In addition, due to the precursor properties, the hydrogel exhibits a relevant mucoadhesive activity. Methods: The swelling degree was evaluated at two different pHs and at defined time intervals. In particular, phosphate buffers were used at pH 6.6, in order to mimic the typical conditions of infectious diseases at the vaginal level, particularly for HIV-seropositive pregnant women, and pH 4.6, to simulate the physiological environment. Results: The obtained results revealed that the hydrogel swells up well at both pHs. Conclusion: Release studies conducted at both pathological and physiological pHs have shown that benzydamine is released at the level of the vaginal mucosa in a slow and gradual manner. These data support the hypothesis of the hydrogel use for the site-specific release of benzydamine in the vaginal mucosa.

scholarly journals Identification of LDPE Grades Focusing on Specific CH2 Raman Vibration Modes

2013 ◽  
Vol 2013 ◽  
pp. 1-6 ◽  
Author(s):  
Richard Jumeau ◽  
Patrice Bourson ◽  
Michel Ferriol ◽  
François Lahure ◽  
Marc Ponçot ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Raman Spectroscopy ◽  
Vibrational Spectroscopy ◽  
Phenomenological Model ◽  
Low Density ◽  
Vibration Modes ◽  
Scanning Calorimetry ◽  
Lamella Thickness ◽  
Poly Ethylene

The possibilities of applications of vibrational spectroscopy techniques (Raman spectroscopy) in the analysis and characterization of polymers are more and more used and accurate. In this paper, our purpose is to characterize Low Density Poly(Ethylene) (LDPE) grades by Raman spectroscopy and in particular with CH2 Raman vibration modes. With temperature measurements, we determine different amorphous and crystalline Raman assignments. From these results and on the basis of the evolution of CH2 bending Raman vibration modes, we develop a phenomenological model in correlation with Differential Scanning Calorimetry and in particular with crystalline lamella thickness determination.

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