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Chemical transformations and phase transitions in polymer rheology and technology
Author(s) -
Malkin A. Ya.,
Kulichikhin S.G
Publication year - 1993
Publication title -
makromolekulare chemie. macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 0258-0322
DOI - 10.1002/masy.19930680123
Subject(s) - rheology , polymerization , curing (chemistry) , oligomer , polymer , materials science , viscosity , colloid , polymer chemistry , kinetics , shearing (physics) , chemical engineering , viscoelasticity , composite material , physics , quantum mechanics , engineering
Fundamental rheokinetic effects observed in processes of linear polymerization and three‐dimensional oligomer curing are discussed. It was shown that changes in rheological properties during linear polymerization can be described by relationships based on treating a reactive mass as a polymer solution, if a newly formed polymer is soluble in reactive medium. Phase separation limits this approach and leads to some new rheological consequences such as change in the rate of viscosity growth (in some cases viscosity can even decrease in the course of polymerization). Shearing influences temperature of a phase transition and kinetics of chemical reaction if it proceeds in heterogeneous conditions. The same phenomena were also observed for oligomer curing which can occur in heterogeneous manner with microgelation and formation of colloid particles of a new phase before the gelation of a system as a whole.