scholarly journals Synthesis and Properties of Thermosets from Tung Oil and Furfuryl Methacrylate

Polymers ◽  
2020 ◽  
Vol 12 (2) ◽  
pp. 258 ◽  
Author(s):  
Sunanda Sain ◽  
Dan Åkesson ◽  
Mikael Skrifvars
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Free Radical ◽  
Raw Materials ◽  
Mechanical Analysis ◽  
Diels Alder ◽  
Tung Oil ◽  
Radical Polymerisation ◽  
High Degree ◽  
Ftir And Raman Spectroscopy

This work focuses on the development of cross-linked polymer from a highly unsaturated vegetable oil, tung oil (TO) and a bio-based acrylate, furfuryl methacrylate (FMA). The presence of a high degree of unsaturated carbon-carbon bonding in TO makes it a suitable precursor for polymer synthesis. Using this advantage of TO, in this work, we have synthesised a cross-linked polymer from TO and FMA through free radical polymerisation followed by Diels–Alder (DA) reaction. Successful incorporation of both of the raw materials and the two chemical reactions was shown using Fourier-transform infrared (FTIR) and Raman spectroscopy. The development of cross-linked structure was analysed through thermogravimetric analysis (TGA) and dynamic mechanical analysis (DMA).

Fourier Transform Raman Spectroscopy for Characterization of Natural Rubber Reversion and of Antireversion Agents

1999 ◽  
Vol 72 (5) ◽  
pp. 829-843 ◽  
Author(s):  
R. N. Datta ◽  
J. W. Hofstraat ◽  
F. A. J. Geurts ◽  
A. G. Talma
Keyword(s):  
Raman Spectroscopy ◽  
Fourier Transform ◽  
Alder Reaction ◽  
Diels Alder ◽  
Low Molecular Weight ◽  
Conjugated Diene ◽  
Diels Alder Reaction ◽  
Fourier Transform Raman Spectroscopy ◽  
Fourier Transform Raman

Abstract Fourier Transform Raman spectroscopy is employed to study the mechanism of reversion and the influence of the antireversion agent, 1,3 bis(citraconimidomethyl)benzene (BCI-MX) in squalene as well as in low molecular weight synthetic polyisoprene. The formation of non-sulfidic main chain modifications, such as conjugated diene and triene units, along the squalene and isoprene backbone is followed by using this technique. The mode of action and the efficacy of BCI-MX is studied. The decrease in concentration of conjugated diene and trienes by the addition of BCI-MX confirms the reaction of BCI-MX with polyenes to be a Diels-Alder reaction. In addition to the detection of reversion reactions also other processes which occur during rubber vulcanization are monitored via Raman spectroscopy.

scholarly journals Differentiation of L-cysteine Sources using FTIR and Raman Spectroscopy

Halalpshere ◽  
2021 ◽  
Vol 1 (1) ◽  
pp. 83-95
Author(s):  
Z. Mohamad Zharif ◽  
Nur Azira Tukiran ◽  
Muhamad Shirwan Abdullah Sani
Keyword(s):  
Raman Spectroscopy ◽  
Raw Materials ◽  
Food Additives ◽  
Primary Source ◽  
Principal Component ◽  
Attenuated Total Reflection ◽  
Primary Sources ◽  
Pre Treatment ◽  
Ftir And Raman Spectroscopy

L-cysteine is a food additive that is used in bakery ingredient. It is used as stabilizer to soften the texture of bakery dough. However, the primary sources of L-cysteine could be controversial as it might derive from animal and human parts. This study aimed to differentiate the L-cysteine sources by using Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) and Raman spectroscopy. Raw materials of pig bristles, human hair, cow horn, duck feather and chicken feather were analysed. The result found that the ATR-FTIR is preferable rather than Raman spectroscopy in differentiating the primary sources of L-cysteine. Data pre-treatment was carried out to provide a more suitable for analysis and easier interpretation. Accordingly, principal component analysis (PCA) transformed the transmittance of ATR-FTIR into a number of principal components (PCs).Five distinct groups were successfully differentiated in PCA. The proposed method offers as fast and environmentally friendly approach to distinguish the primary source of L-cysteine sources. Hence, this method would beneficial to be used for origin determination of L-cysteine food additives.

An attenuated total reflection (ATR) and Raman spectroscopic investigation into the effects of chloroquine on Plasmodium falciparum-infected red blood cells

The Analyst ◽  
2015 ◽  
Vol 140 (7) ◽  
pp. 2236-2246 ◽  
Author(s):  
M. Kozicki ◽  
D. J. Creek ◽  
A. Sexton ◽  
B. J. Morahan ◽  
A. Wesełucha-Birczyńska ◽  
...  
Keyword(s):  
Raman Spectroscopy ◽  
Plasmodium Falciparum ◽  
Fourier Transform ◽  
Red Blood Cells ◽  
Blood Cells ◽  
Total Reflection ◽  
Attenuated Total Reflection ◽  
Raman Spectroscopic ◽  
Human Red Blood Cells ◽  
Ftir And Raman Spectroscopy

Attenuated Total Reflection Fourier Transform Infrared (ATR-FTIR) and Raman spectroscopy were used to compare chloroquine (CQ)-treated and untreated cultured Plasmodium falciparum-infected human red blood cells (iRBCs).

A possibility of using nickel concentrate, obtained as a result of hydrometallurgical enrichment of manganese-containing raw materials, at steel alloying

2020 ◽  
Vol 76 (7) ◽  
pp. 709-715
Author(s):  
O. Yu. Kichigina
Keyword(s):  
Raw Materials ◽  
Experimental Studies ◽  
Selective Extraction ◽  
Technological Parameters ◽  
Nickel Iron ◽  
Nickel Recovery ◽  
Nickel Concentrate ◽  
Steel Alloying ◽  
High Degree ◽  
Comprehensive Processing

At production of stainless steel expensive alloying elements, containing nickel, are used. To decrease the steel cost, substitution of nickel during steel alloying process by its oxides is an actual task. Results of analysis of thermodynamic and experimental studies of nickel reducing from its oxide presented, as well as methods of nickel oxide obtaining at manganese bearing complex raw materials enrichment and practice of its application during steel alloying. Technology of comprehensive processing of complex manganese-containing raw materials considered, including leaching and selective extraction out of the solution valuable components: manganese, nickel, iron, cobalt and copper. Based on theoretical and experiment studies, a possibility of substitution of metal nickel by concentrates, obtained as a result of hydrometallurgical enrichment, was confirmed. Optimal technological parameters, ensuring high degree of nickel recovery out of the initial raw materials were determined. It was established, that for direct steel alloying it is reasonable to add into the charge pellets, consisting of nickel concentrate and coke fines, that enables to reach the through nickel recovery at a level of 90%. The proposed method of alloying steel by nickel gives a possibility to decrease considerably steel cost at the expense of application of nickel concentrate, obtained out of tails of hydrometallurgical enrichment of manganese-bearing raw materials, which is much cheaper comparing with the metal nickel.

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