Alcohol, Tertiary Butyl

Monomeric styrenes are demonstrated as excellent embedding media for electron microscopy. Monomeric styrene has extremely low viscosity and low surface tension (less than 1) affording extremely rapid penetration into the specimen. Spurr's Medium based on ERL-4206 (J.Ultra. Research 26, 31-43, 1969) is viscous, requiring gradual infiltration with increasing concentrations. Styrenes are soluble in alcohol and acetone thus fitting well into the usual dehydration procedures. Infiltration with styrene may be done directly following complete dehydration without dilution.Monomeric styrenes are usually inhibited from polymerization by a catechol, in this case, tertiary butyl catechol. Styrene polymerization is activated by Methyl Ethyl Ketone peroxide, a liquid, and probably acts by overcoming the inhibition of the catechol, acting as a source of free radical initiation.Polymerization is carried out either by a temperature of 60°C. or under ultraviolet light with wave lengths of 3400-4000 Engstroms; polymerization stops on removal from the ultraviolet light or heat and is therefore controlled by the length of exposure.

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Electron microscopy and diffraction of crystalline dendrimers and macrocycles

Proceedings, annual meeting, Electron Microscopy Society of America ◽

10.1017/s0424820100151921 ◽

1993 ◽

Vol 51 ◽

pp. 1218-1219

Author(s):

C. J. Buchko ◽

P. M. Wilson ◽

Z. Xu ◽

J. Zhang ◽

S. Lee ◽

...

Keyword(s):

Electron Microscopy ◽

Liquid Crystalline ◽

Structural Information ◽

High Resolution Electron Microscopy ◽

Scanning Calorimetry ◽

Tertiary Butyl ◽

Phenyl Acetylene ◽

Selected Area Electron Diffraction ◽

Liquid Crystalline Phases ◽

Resolution Electron

The synthesis of well-defined organic molecules with unique geometries opens new opportunities for understanding and controlling the organization of condensed matter. Here, we study dendrimers and macrocycles which are synthesized from rigid phenyl-acetylene spacer units, Both units are solubilized by the presence of tertiary butyl groups located at the periphery of the molecule. These hydrocarbon materials form crystalline and liquid crystalline phases which have been studied by differential scanning calorimetry, hot stage optical microscopy, and wide-angle x-ray scattering (WAXS).The precisely defined architecture of these molecules makes it possible to investigate systematic variations in chemical architecture on the nature of microstructural organization. Here we report on the transmission electron microscopy (TEM), selected area electron diffraction (SAED), and high resolution electron microscopy (HREM) studies of crystalline thin films formed by deposition of these materials onto carbon substrates from dilute solution. Electron microscopy is very attractive for gaining structural information on new molecules due to the scarcity of material to grow single crystals suitable for conventional crystallography.

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APPLICATION OF IR SPECTROSCOPY IN THE STUDY OF MINERAL OIL

Oil and Gas Studies ◽

10.31660/0445-0108-2017-1-91-95 ◽

2017 ◽

pp. 91-95

Author(s):

E. I. Grushova ◽

A. .. Al Razuqi ◽

E. S. Chaiko ◽

O. A. Miloserdova

Keyword(s):

Ir Spectroscopy ◽

Group Composition ◽

Mineral Oil ◽

Vacuum Distillate ◽

Methyl Tertiary Butyl Ether ◽

Butyl Ether ◽

Tertiary Butyl ◽

Mineral Oils ◽

Modifying Additive

IR spectroscopy investigated structural and group composition of base mineral oils isolated from the vacuum distillate by selective purification of N-methylpyrrolidone and the low temperature dewaxing in the presence of a solvent. The role of the latter was carried out by the systems acetone - toluene, acetone - methyl tertiary butyl ether, methyl ethyl ketone - toluene, acetone - toluene - modifying additive. It was shown that the chemical composition of the group of base oils and slack waxes is defined as the nature of the solvent to the dewaxing, and oils sequence of purification steps.

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