369. Reactions of peroxides in NN-dimethylformamide solution. Part I. The induced decomposition of benzoyl peroxide

1959 ◽  
pp. 1860 ◽  
Author(s):  
C. H. Bamford ◽  
E. F. T. White
Keyword(s):  
Benzoyl Peroxide ◽  
Induced Decomposition ◽  
Dimethylformamide Solution

Reactions of Aroyl Peroxides. II. Substituted Benzoyl Peroxides with Benzene

1957 ◽  
Vol 10 (1) ◽  
pp. 49 ◽  
Author(s):  
KH Pausacker
Keyword(s):  
Benzoyl Peroxide ◽  
Induced Decomposition

Six symmetrically disubstituted benzoyl peroxides have been reacted with benzene and the nature of the products has been determined. The reactions of the m-methoxy-, p-methoxy-, p-chloro-, and p-methylbenzoyl peroxides are very similar to the reaction of benzoyl peroxide itself (Part I of this series (Lynch and Pausacker 1957)), but it has been found that m-nitro- and p-nitrobenzoyl peroxide give very much higher yields of the corresponding diphenyl. This is explained by assuming that the latter two compounds are more susceptible to induced decomposition.

Comparison of isothermal and non-isothermal chemiluminescence and differential scanning calorimetry experiments with benzoyl peroxide

2009 ◽  
Vol 63 (4) ◽  
Author(s):  
Jozef Rychlý ◽  
Aysegul Kocer ◽  
Fathy Tanis ◽  
Lyda Matisová-Rychlá ◽  
Ivica Janigová ◽  
...  
Keyword(s):  
Differential Scanning Calorimetry ◽  
Benzoyl Peroxide ◽  
Light Emission ◽  
Disproportionation Reaction ◽  
Peroxyl Radicals ◽  
Scanning Calorimetry ◽  
Peroxide Decomposition ◽  
Main Portion ◽  
Induced Decomposition ◽  
Kinetics Of

AbstractDifference in the kinetics of chemiluminescence (CL) and differential scanning calorimetry records for decomposition of originally solid benzoyl peroxide continuing as a melt reaction was outlined. While the main portion of heat measured by DSC is released in the spontaneous decomposition of benzoyl peroxide starting as a homolytic scission of peroxidic bonds, the CL light emission in oxygen comes presumably from the subsequent disproportionation reaction of polyphenyl peroxyl radicals and monitors the induced decomposition of peroxide. Thermogravimetry revealed that oxygen remains partially bound to the products of benzoyl peroxide decomposition.

Elucidation of block boundaries as the dissolution channels in hydrated cement

1978 ◽  
Vol 36 (1) ◽  
pp. 484-485
Author(s):  
N.V. Belov ◽  
U.I. Papiashwili ◽  
B.E. Yudovich
Keyword(s):  
Liquid Phase ◽  
Grain Boundaries ◽  
Benzoyl Peroxide ◽  
Phase Contrast ◽  
Active Role ◽  
Point Of View ◽  
Hardened Cement ◽  
Hydrated Cement ◽  
Hardened Cement Paste

It has been almost universally adopted that dissolution of solids proceeds with development of uniform, continuous frontiers of reaction.However this point of view is doubtful / 1 /. E.g. we have proved the active role of the block (grain) boundaries in the main phases of cement, these boundaries being the areas of hydrate phases' nucleation / 2 /. It has brought to the supposition that the dissolution frontier of cement particles in water is discrete. It seems also probable that the dissolution proceeds through the channels, which serve both for the liquid phase movement and for the drainage of the incongruant solution products. These channels can be appeared along the block boundaries.In order to demonsrate it, we have offered the method of phase-contrast impregnation of the hardened cement paste with the solution of methyl metacrylahe and benzoyl peroxide. The viscosity of this solution is equal to that of water.

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