Thermal Behavior of Certain Resin Acids.

1966 ◽  
Vol 11 (1) ◽  
pp. 89-91 ◽  
Author(s):  
Walter H. Schuller ◽  
Carl M. Conrad
Keyword(s):  
Thermal Behavior ◽  
Resin Acids

The Thermal Behavior of Some Resin Acids at 400–500 °C

1972 ◽  
Vol 50 (14) ◽  
pp. 2224-2229 ◽  
Author(s):  
Ray F. Severson ◽  
Walter H. Schuller
Keyword(s):  
Mass Spectrum ◽  
Thermal Behavior ◽  
Abietic Acid ◽  
Dehydroabietic Acid ◽  
Resin Acids ◽  
Levopimaric Acid

The hot tube pyrolysis of dehydroabietic acid (1) at 400–500 °C was found to produce as major products the three possible A-ring olefins (19-norabieta-4,8,11,13-tetraene (2); 19-norabieta-4(18),8,11,13-tetraene (3); and 19-norabieta-3,8,11,13-tetraene (4)) resulting from the elimination of the carboxylate moiety. The i.r., n.m.r., u.v., and mass spectrum of each olefln was obtained and discussed. The pyrolysis of abietic acid (7) and levopimaric acid (8) under identical conditions was found to yield A-ring olefins; to isomerize to yield varying mixtures of palustric, 7, and neoabietic acids; to dehydrogenate to yield 1; and to eliminate propylene to form deisopropyldehydroabietic acid (15). A mechanism to explain the formation of 15 from the dienoic resin acids is given.

Comparative analysis of butter thermal behavior in combination with bovine tallow

2020 ◽  
Vol 40 (suppl 2) ◽  
pp. 597-604
Author(s):  
Zahra NILCHIAN ◽  
Mohamad Reza EHSANI ◽  
Zahra PIRAVI-VANAK ◽  
Hossein BAKHODA
Keyword(s):  
Comparative Analysis ◽  
Thermal Behavior

NUMERICAL AND EXPERIMENTAL STUDY OF TRANSIENT THERMAL BEHAVIOR OF ELECTRONIC INFRARED RADIATION CONTROL MODULE

2019 ◽  
Vol 50 (17) ◽  
pp. 1721-1736
Author(s):  
Kaiqiang Hou ◽  
Xiaolong Weng ◽  
Wei Luo ◽  
Le Yuan ◽  
Wei Duan ◽  
...  
Keyword(s):  
Experimental Study ◽  
Thermal Behavior ◽  
Infrared Radiation ◽  
Control Module ◽  
Radiation Control ◽  
Transient Thermal

Synthesis, Characterization and Thermal studies of Novel Organomercury Driven from Sulfa Drugs Part 1

2011 ◽  
Vol 7 (2) ◽  
pp. 1338-1347
Author(s):  
Tarek Ali Fahad ◽  
Shaker.A.N. AL-Jadaan
Keyword(s):  
Thermal Decomposition ◽  
Thermal Behavior ◽  
1H Nmr ◽  
Elemental Analysis ◽  
Thermal Studies ◽  
Spectroscopic Techniques ◽  
Sulfa Drugs ◽  
Acid Base ◽  
Ph Values ◽  
Multi Stage

Two new heterocyclic Organmercury compounds   were prepared from the reaction of Sulfamethaxazole and Sulfadiazine with 4-acetaminophenol as a coupler and separated as solids with characteristic colors. these compounds were characterized by F.T.IR-spectroscopy 1H-NMR , Micro-elemental Analysis and UV-Vis spectroscopic techniques . The work involves a study of acid – base properties compounds at different pH values, the ionization and protonation constants were calculated. The thermal behavior of these two compounds   were investigated on the basis of thermogravimetric (TGA) and differential thermogravimetric (DTG) analyses, Thermal decomposition of these compounds is multi-stage processes.

THERMAL BEHAVIOR AND IGNITION OF HIGH-ENERGY MATERIALS CONTAINING B, ALB2, AND TIB2

2020 ◽  
Author(s):  
A. G. Korotkikh ◽  
◽  
V. A. Arkhipov ◽  
I. V. Sorokin ◽  
E. A. Selikhova ◽  
...  
Keyword(s):  
Heat Flux ◽  
Thermal Behavior ◽  
Flux Density ◽  
Ignition Delay ◽  
Delay Time ◽  
Heat Flux Density ◽  
Ignition Delay Time ◽  
High Energy ◽  
Energy Materials ◽  
High Energy Materials

The paper presents the results of ignition and thermal behavior for samples of high-energy materials (HEM) based on ammonium perchlorate (AP) and ammonium nitrate (AN), active binder and powders of Al, B, AlB2, and TiB2. A CO2 laser with a heat flux density range of 90-200 W/cm2 was used for studies of ignition. The activation energy and characteristics of ignition for the HEM samples were determined. Also, the ignition delay time and the surface temperature of the reaction layer during the heating and ignition for the HEM samples were determined. It was found that the complete replacement of micron-sized aluminum powder by amorphous boron in a HEM sample leads to a considerable decrease in the ignition delay time by a factor of 2.2-2.8 at the same heat flux density due to high chemical activity and the difference in the oxidation mechanisms of boron particles. The use of aluminum diboride in a HEM sample allows one to reduce the ignition delay time of a HEM sample by a factor of 1.7-2.2. The quasi-stationary ignition temperature is the same for the AlB2-based and AlB12-based HEM samples.

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