Premium
Effect of polyfunctional chain transfer agents on molecular weight distribution in free‐radical polymerization, 2 . The case C ≤ 1
Author(s) -
Yuan Cui Ming,
Farina Mario
Publication year - 1994
Publication title -
macromolecular theory and simulations
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.37
H-Index - 56
eISSN - 1521-3919
pISSN - 1022-1344
DOI - 10.1002/mats.1994.040030117
Subject(s) - chain transfer , molar mass distribution , chemistry , polymerization , transfer agent , degree of polymerization , radical polymerization , polymer chemistry , kinetic chain length , chain (unit) , polymer , thermodynamics , constant (computer programming) , distribution (mathematics) , distribution function , transfer (computing) , living polymerization , organic chemistry , mathematics , physics , mathematical analysis , astronomy , parallel computing , computer science , programming language
In this part of the series, the influence of polyfunctional chain transfer agents with transfer constant C ≤ 1 on the molecular weight distribution was studied. The analytical expressions for the number‐ and weight‐average degree of polymerization, and dispersion index were derived by kinetic and statistical methods. The expression for the molecular weight distribution can only be obtained by statistical methods. Some numerical examples on the dependence of distribution parameters as a function of the functionality of transfer agents f and transfer constants are illustrated. A critical value of the chain transfer constant was found to exist, which permits the synthesis of linear (for f = 2) or branched polymers ( f > 2) with DP w / DP n approximately equal to 2 during the entire course of the polymerization.