Accession Number:

AD0628301

Title:

INVESTIGATION OF THE ROLE OF FREE RADICALS IN THE ACETALDEHYDE POLYMERIZATION PROCESS IN THE SOLID PHASE UNDER GAMMA-IRRADIATION,

Descriptive Note:

Corporate Author:

FOREIGN TECHNOLOGY DIV WRIGHT-PATTERSON AFB OHIO

Personal Author(s):

Report Date:

1965-11-05

Pagination or Media Count:

16.0

Abstract:

The EPR method was used to investigate the processes of formation and recombinations of the radicals that form in crystalline acetaldehyde under gamma-irradiation. It was established that in the dose range from 0.1 to 10 Mrad, the radical concentration corresponds in order of magnitude to the concentration of polymer chains. Radical recombination takes place abruptly at temperatures coinciding with the critical temperatures determined by the thermography method. It was found that monomolecular rapture takes place at small radiation doses at larger doses 0.2 Mrad and up, chain rupture takes place in accordance with a bimolecular law. UV radiation initiates polymerization of crystalline acetaldehyde. The nature of the radicals that appear corresponds perfectly to that of the radicals formed on exposure to gamma-radiation the concentration of the radicals corresponds to that of the molecular chains. The results obtained justify the assumption that polymerization of crystalline acetaldehyde proceeds by the radical mechanism when initiated by either ionizing radiation or ultraviolet light. Author

Subject Categories:

  • Radiation and Nuclear Chemistry
  • Plastics

Distribution Statement:

APPROVED FOR PUBLIC RELEASE