INDEX radicals, generation

We note that chemical substitution of a radical into a basic compound corresponds (in the sense of the main theorem of Chapter 1) to the algebraic substitution of the generating function into the cycle index of the group of the basic compound. 

Silane radical atom transfer (SRAA) was demonstrated as an efficient, metal-free method to generate polystyrene of controllable molecular weight and low polydispersity index values. (TMSlsSi radicals were generated in situ by reaction of (TMSlsSiH with thermally generated f-BuO radicals as depicted in Scheme 14. (TMSlsSi radicals in the presence of polystyrene bromide (PS -Br), effectively abstract the bromine from the chain terminus and generate macroradicals that undergo coupling reactions (Reaction 70). 

They are discrete transforms and can therefore operate directly on the separate equations for each species, reducing them to one expression. Nonlinear terms arising from condensation polymerization can be handled and, with some difficulty, so can realistic terminations in free radical polymerization. They are a special case of the generating functions and can be used readily to calculate directly the moments of the distribution, and thus, average molecular weights and dispersion index, etc. Abraham (2) provided a short table of Z-transforms and showed their use with stepwise addition. 

The free radical reactions below have been classified into three main categories those which increase the number of free radicals, those which conserve, and those which decrease the number of free radicals. A two-letter index has been given beside the descriptive term of the reaction which will be used when generating mechanisms. The meaning of the symbols +M and (+M) will be commented on in paragraph 2. The examples are presented with the NANCY linear chemical notation described in the appendix NOTATIONS at the end of the book. 

Properties Colorless to It. straw clear liq. very taint, char, odor pract. insol. in water completely sol. in most org. soivs., monomers, oligomers, and resins sp.gr. 1.053 (20 C) vise. 55 MPa-s-(20 C) b.p. 310-330 C pour pt. - 7 C flash pt. (PMCC) 140 C ret. index 1.5822 Storage Store away from direct sunlight, oxidizing agents and materials which may generate free radicals storage temps, should not be > 90 F use within six months Esapal [Lamberti]... 

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