Anomalous Thermal Behavior of Salicylsalicylic Acid and Evidence for a Monotropic Transition to a Nematic Phase

2004 ◽  
Vol 108 (23) ◽  
pp. 7955-7962 ◽  
Author(s):  
Joaquim J. Moura Ramos ◽  
Hermínio P. Diogo ◽  
Maria Helena Godinho ◽  
Carlos Cruz ◽  
Katarzyna Merkel
Keyword(s):  
Thermal Behavior ◽  
Nematic Phase ◽  
Salicylsalicylic Acid

The Synthesis and Phase Behavior of a Novel Discoticnematic Triphenylene Mesogen and its Application to an Optically Anisotropic Film

2008 ◽  
Vol 373-374 ◽  
pp. 678-681 ◽  
Author(s):  
Chun Xiu Zhang ◽  
Zhi Qun He ◽  
Jia Ling Pu ◽  
Jun Jie Wang ◽  
Yong Sheng Wang ◽  
...  
Keyword(s):  
Methyl Methacrylate ◽  
Thermal Behavior ◽  
Phase Behavior ◽  
Differential Scanning Calorimeter ◽  
Glass Substrate ◽  
Nematic Phase ◽  
Polyimide Film ◽  
Optical Microscope ◽  
X Ray Diffraction ◽  
X Ray

A novel discotic triphenylene derivative bearing one triphenylene discogen as core and three cyano-biphenyl moieties was synthesized and its thermal behavior was studied using polarizing optical microscope, differential scanning calorimeter and X-ray diffraction. It was found that this molecule containing [decylene?] spacers showed nematic phase. After being mixed with methyl methacrylate (MMA), the discogen showed nematic phase at the mesophase temperature range (64~85 °C) and oriented spontaneously in the mixture after annealing for 2 hours in the mixture. The orientation can be stabilized by the polymerization of MMA. The orientation can be fixed by the polymerization of MMA. It was treated directly on glass substrate, which surface did not treat by polyimide film and confirmed the orientation was proved by X-ray diffraction. This offers If the alignment of the discotic molecules can be freely controlled and fixed, a useful mean to produce new area of optically anisotropic film will be produced with this material.

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.

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