Accession Number : AD0642269

Title :   A KINETIC INVESTIGATION ON THE FORMATION OF AMORPHOUS AND CRYSTALLINE POLYETHYLIDENE FROM THE DECOMPOSITION OF DIAZOETHANE IN ETHYL ETHER USING GOLD AS CATALYST.

Descriptive Note : Technical note,

Corporate Author : TURIN UNIV (ITALY) ISTITUTO DI CHIMICA ANALITICA

Personal Author(s) : Trossarelli,L.

Report Date : 01 APR 1963

Pagination or Media Count : 17

Abstract : The kinetics of both amorphous and crystalline polyethylidene formation from the gold catalyzed decomposition of diazoethane in ethyl ether solutions was investigated. The results show that the rate of both amorphous and crystalline polyethylidene formation is proportional to the first power of the catalyst concentration and does not depend upon diazoethane concentration in the range of diazoethane concentrations between 0.04 and 0.3 moles/litre. Apparent energies of activation of 12 and 8 Kcal/mole were calculated for the processes leading to amorphous polyethylidene and to crystalline polyethylidene respectively. The degree of polymerization of the amorphous polyethylidene obtained from the gold catalyzed decomposition of ethyl ether solutions of diazoethane decreases with increasing the temperature of reaction as with increasing the concentration of the catalyst and of diazoethane. On the basis of the experimental results, some hypotheses upon the mechanism of the reactions leading to amorphous and crystalline polyalkylidenes from the metal catalyzed decompositions of diazoalkanes are drawn. (Author)

Descriptors :   (*POLYMERS, SYNTHESIS(CHEMISTRY)), (*NITROGEN HETEROCYCLIC COMPOUNDS, DECOMPOSITION), (*GOLD, CATALYSIS), ALKENES, ALKANES, POLYMERIZATION, REACTION KINETICS, CONCENTRATION(CHEMISTRY), HEAT OF ACTIVATION, ORGANIC SOLVENTS, ITALY

Subject Categories : Physical Chemistry
      Polymer Chemistry

Distribution Statement : APPROVED FOR PUBLIC RELEASE