Accession Number : AD0687756

Title :   SOME ASPECTS OF KINETICS OF SOLID PHASE POLYMERIZATION,

Corporate Author : ARMY FOREIGN SCIENCE AND TECHNOLOGY CENTER WASHINGTON D C

Personal Author(s) : Kabanov,V. A. ; Panisov,P. M. ; Kargin,V. A.

Report Date : 01 APR 1969

Pagination or Media Count : 16

Abstract : Solid phase polymerization is considered as a nonequilibrium phase transformation: Crystalline monomer - polymer. An expression is obtained for the dimension of the crystalline seed of the polymer phase with the assumption that it represents macromolecules which are packed in parallel. The notion was put forth that the S-shaped form of the kinetic curves of solid phase polymerization is connected with the slow generation and following rapid development of the polymer phase. The hypothesis was put forth that under the influence of radiations of high energy on the crystallaine monomer, 'hot' areas are created in the crystalline monomer in which polymer chains may continue to grow and and which will turn out to be thermodynamically unstable when these 'hot' areas are 'cooled'; a further effect of radiation may be caused by the chain decay of these unstable molecules to the monomer state. It was shown that the formation of thermodynamically unstable chains in the crystal of the monomer, accompanying their formation by 'annealing' and then by 'usual' polymerization, may be in a number of cases the reason for the complicated character of the kinetics of solid phase polymerization under the effect of radiation. (Author)

Descriptors :   (*POLYMERIZATION, *CRYSTALS), (*RADIATION CHEMISTRY, POLYMERIZATION), REACTION KINETICS

Subject Categories : Physical Chemistry
      Radiation and Nuclear Chemistry
      Plastics

Distribution Statement : APPROVED FOR PUBLIC RELEASE