TETRAMETHYLTHIURAM MONOSULFIDE AND TETRAMETHYLTHIURAM DISULFIDE: HEATS OF FORMATION BY ROTATING-BOMB CALORIMETRY; THE S-S THERMOCHEMICAL BOND ENERGY

1961 ◽  
Vol 65 (5) ◽  
pp. 860-862
Author(s):  
W. D. Good ◽  
J. L. Lacina ◽  
J. P. McCullough
Keyword(s):  
Bond Energy ◽  
Heats Of Formation ◽  
Bomb Calorimetry ◽  
Tetramethylthiuram Disulfide ◽  
Rotating Bomb Calorimetry

Tetramethylthiuram Monosulfide and Tetramethylthiuram Disulfide: Heats of Formation and the S—S Thermochemical Bond Energy

1962 ◽  
Vol 35 (3) ◽  
pp. 661-664
Author(s):  
W. D. Good ◽  
J. L. Lacina ◽  
J. P. McCullough
Keyword(s):  
Bond Energy ◽  
Combustion Calorimetry ◽  
Heats Of Formation ◽  
Normal Alkane ◽  
Tetramethylthiuram Disulfide ◽  
Heats Of Combustion

Abstract The heats of combustion and formation were determined for tetramethylthiuram monosulfide [bis-(dimethylthiocarbamoyl) sulfide] and tetramethylthiuram disulfide [bis-(dimethylthiocarbamoyl) disulfide]. The S—S thermochemical bond energy in tetramethylthiuram disulfide was shown to be about the same as in normal alkane disulfides and in S8. Rotating-bomb combustion calorimetry was found satisfactory for compounds that contain both sulfur and nitrogen.

Enthalpy of formation of tetrabromomethane by rotating-bomb calorimetry

1984 ◽  
Vol 16 (7) ◽  
pp. 661-668 ◽  
Author(s):  
James Bickerton ◽  
Manuel E Minas da Piedade ◽  
Geoffrey Pilcher
Keyword(s):  
Enthalpy Of Formation ◽  
Bomb Calorimetry ◽  
Rotating Bomb Calorimetry

FLUORINE BOMB CALORIMETRY. V. THE HEATS OF FORMATION OF SILICON TETRAFLUORIDE AND SILICA1,2

1963 ◽  
Vol 67 (4) ◽  
pp. 815-821 ◽  
Author(s):  
Stephen S. Wise ◽  
John L. Margrave ◽  
Harold M. Feder ◽  
Ward N. Hubbard
Keyword(s):  
Silicon Tetrafluoride ◽  
Heats Of Formation ◽  
Bomb Calorimetry ◽  
Fluorine Bomb Calorimetry

Tetraethyllead: Heat of Formation by Rotating-Bomb Calorimetry.

1956 ◽  
Vol 60 (8) ◽  
pp. 1090-1095 ◽  
Author(s):  
D. W. Scott ◽  
W. D. Good ◽  
Guy Waddington
Keyword(s):  
Heat Of Formation ◽  
Bomb Calorimetry ◽  
Rotating Bomb Calorimetry

Mechanism of the Action of Accelerators of Vulcanization. Vulcanization of Rubber by a Sulfur Radioisotope

1954 ◽  
Vol 27 (4) ◽  
pp. 974-976 ◽  
Author(s):  
G. A. Blokh
Keyword(s):  
Bond Energy ◽  
Disulfide Bonds ◽  
Sodium Sulfite ◽  
Butadiene Rubber ◽  
Exchange Reactions ◽  
Cent Solution ◽  
Tetramethylthiuram Disulfide ◽  
Cold Acetone ◽  
Rubber Accelerators

Abstract The problem of the mechanism of the action of accelerators and vulcanizing agents during the vulcanization of rubber has been studied in earlier works. It was shown that, during the vulcanization of natural and sodium-butadiene rubber, accelerators of the type of mercaptobenzothiazole and tetramethylthiuram disulfide enter into exchange reactions with the vulcanizing agent, sulfur. However, the role of the chemically combined sulfur, that is, the so-called bridge sulfur, in the exchange reactions with the accelerators remained unexplained. As Dogadkin and Tarasova show, in the case of sulfur vulcanizates, the following kinds of bonds between the rubber chains can occur : (1) —C—C—, formed as a result of polymerization or condensation processes (bond energy 62.7 kcal. per mole); (2) —C—S—C—, monosulfide bonds, formed during thiuram vulcanization (bond energy 54.5 kcal. per mole) ; (3) —C—S—S—C—, disulfide bonds; (4) —C—Sn—C—, polysulfides, formed during vulcanization with elemental sulfur in the absence of accelerators containing sulfur (bond energy 27.5 kcal. per mole). These authors established the presence of polysulfide bonds by extracting sulfur from vulcanizates, already extracted with cold acetone, by heating the extracted vulcanizate in a 10 per cent solution of sodium sulfite. Ten to twenty per cent of the total amount of combined sulfur was thus extracted as polysulfide, whereas rubber vulcanized with thiuram contained no sulfur at all which could be extracted by sodium sulfite. In order to study the exchange reactions between accelerators containing sulfur and chemically combined or bridge sulfur, the present investigation was made.

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