摘要:

Equipment for studying the effects of alternating fields on chemical reactions is described. The catalyzed polymerization of liquid styrene was investigated, with fields of frequencies ranging from 1.15 to 7.72 Mc. and with field strengths up to 4500 v. per cm. The rate of polymerization was reduced by the application of the fields, the inhibition increasing approximately as the square of the voltage. The fields appeared to have a greater inhibiting effect on the oxygen-catalyzed than on the benzoyl peroxide – catalyzed reaction. Varying the frequency over the above range had no effect on the amount of inhibition caused by the field. At all temperatures, catalyst concentrations, voltages, and frequencies, the fields had no significant effect on the viscosity-average molecular weight of the polymer.

ISSN:1923-4287    

DOI:10.1139/cjr50b-018

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

The infrared spectra of light and heavy trichloroethylene and asymmetrical tetrachloroethane have been obtained from 2.5 to 25 μ. Tentative assignments of the fundamentals have been made.

ISSN:1923-4287    

DOI:10.1139/cjr50b-019

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

Relations for the solvent effect on the rate of a unimolecular, nonionic reaction are derived, using existing theories of solutions and of chemical kinetics. The kinetics of thecis-transisomerization of azobenzene were investigated in 16 pure solvents. A linear relation between the activation energy,E, and the square root of the internal pressure of the solvent, (P′S)1/2was found, in agreement with the theory. Linear relations between logAandE, and between logkand (P′S)1/2were also found, but the results for the reaction in highly polar solvents deviated significantly from these relations. The kinetics of the reaction in mixed solvents indicate that the azobenzene is preferentially surrounded by the component in which it is more readily soluble.

ISSN:1923-4287    

DOI:10.1139/cjr50b-020

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

The values reported by Yaffe for the solubilities of thorium nitrate tetrahydrate and uranyl nitrate hexahydrate in various organic solvents are compared with those previously reported by Templeton and Hall, the former being much lower than the latter. Some of the accessory experiments of Templeton and Hall are here presented in support of the position that their values more closely correspond to equilibrium than those of Yaffe.

ISSN:1923-4287    

DOI:10.1139/cjr50b-021

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

The present paper is a record of certain of the physical properties of solutions of silver nitrate and of ammonium nitrate, which were made by us in connection with our work on conductance. Some of these properties were actually used in calculations, others not, but they are collected here in their entirety. The properties described are: (1) normal boiling point; (2) densities and partial molar volume of water in solution; (3) viscosities at different concentrations and temperatures, as compared with those of a typical nonelectrolyte, urea; (4) the temperature coefficient of fluidity compared with the temperature coefficient of conductance; (5) the distribution coefficient of acetic acid between ether and solutions of silver nitrate.

ISSN:1923-4287    

DOI:10.1139/cjr50b-022

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr50b-023

出版商:NRC Research Press    

年代:1950

数据来源: NRC

摘要:

not available

ISSN:1923-4287    

DOI:10.1139/cjr50b-024

出版商:NRC Research Press    

年代:1950

数据来源: NRC