Waste-free splitting

Korolev, A. V.; Bolkunov, V. V.; Королев, А. В.

doi:10.3103/s1068798x09110148

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“…Free radicals R • in structured reaction media are characterized by long lifetimes (τ R ), which is why direct measurement of R • concentrations by the EPR method is possible for TFRP [3,6,[29][30][31][32][33][34][35][36][37][38][39][40][41][42][43]. The application of the EPR method appeared to be most effective for the following scientific directions: studying the kinetics of accumulation and decay of free radicals and structural and physical studies.…”

Section: Eprmentioning

confidence: 99%

“…in Nonstationary Mode [33,34] In the case of thermal decomposition of initiators (organic peroxides) in partially cured oligo(acrylate) (with conversion being within 30-70%), it is possible to select such an experimental temperature at which the EPR method is capable of recording (during a period of 10-20 min) the R • accumulation kinetics described for the nonstationary mode by the following classical formula:…”

Section: Studying the Kinetics Of Free-radical Accumulationmentioning

confidence: 99%

“…Thus, this method enables researchers to determine the values of k i , k dec , k ter , and f for TFRP in the case of high conversion and, hence, to evaluate the influence of cross-linking on the processes of chain initiation and termination. It appeared that for oligo(acrylates), as conversion increases from 0 to 70-90%, the value of k ter decreases 106-107 fold, while f = 25-50 fold for organic peroxides and 250-500 fold for initiators of azonitrile type [33,34].…”

Section: Studying the Kinetics Of Free-radical Accumulationmentioning

confidence: 99%

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Methods for Studying Three-Dimensional Free-Radical Polymerization and Cross-Linked Polymers

Korolev

Mogilevich

Three-Dimensional Free-Radical Polymerization

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Chapter 9 will be useful for those who are wishing to master the field of three-dimensional free-radical copolymerization because it contains a general description of applicability of various methods used in analytical and physical chemistry for specific tasks: studying the kinetics and peculiarities of cross-linked polymers formation using the TFRP method.Conventional and widely known methods for high-molecular compound chemistry that are described in detail in scientific publications are inapplicable for threedimensional free-radical polymerization (TFRP) with formation of cross-linked polymers because the reaction medium is strongly structured, starting from small degrees of conversion (from the gel point), and produces polymers are nonfusible and insoluble. Therefore, this chapter gives a brief description of well-proven experimental methods used to study TFRP kinetics and the mechanism as well as the structure and properties of cross-linked polymers.

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