Unbranched Chain Reactions in Solids and in Viscous Media: Nontraditional Methods and Analysis
The most clear explanation of the phenomenon and others non-trivial kinetic particularities of unbranched chain reactions in solids and viscous media on the quantitative level was given in 2008. This became possible taking into account the formation of friable zones (FZs) near nano-defects with an excess of free volume in solids. It was shown that only in FZs the steric hindrances to the chemical interaction of CAC with neighboring particles reagents are removed. Proper accounting of the concentration evolution of mentioned FZs in the studied systems allowed to explain the nontrivial kinetic features of unbranched chain reactions in solids on the example of the solid phase polymerization of different monomers. A model describing the kinetics of solid phase polymerization in the form of the original system of equations was developed. Living radical polymerization for the first time was performed in 1972 on the example of post-polymerization of n-butyl methacrylate in admixture with ZnCl2.