Determination of Monomer Transfer Constants in Emulsion Polymerization

Bimodal molecular weight distribution formed in the emulsion polymerization of ethylene

“…The MC simulation method reported in ref. 9, in which the polymer‐transfer reaction is included in the simulation program developed for linear emulsion polymerization,10 is used. In this MC method, the polymer particles are sampled randomly from the reaction mixture, and the history of polymer formation in each polymer particle is simulated directly.…”

“…In addition, the weight of a polymer particle is close to the high MW, narrow distribution component. 1 In this article, the emulsion polymerization of ethylene is simulated with the MC method proposed earlier, 9 and this hypothesis, that the sharp peak at a high MW is formed by the limited volume effect, is examined.…”

Measurement of Transfer Coefficients to Monomer for n‐Butyl Methacrylate by Molecular Weight Distributions from Emulsion Polymerization

“…[7,8] An alternative formulation, [9] which has been shown to be of equivalent reliability by Heuts and Davis, [10] makes use of the information provided by the complete molecular weight distribution (MWD) (P(M)) to obtain consistent values for chain transfer coefficients. [7,8,[11][12][13][14][15][16] In the portion of this distribution where chain termination is dominated by chain transfer to monomer, the relationship ln(P(M)) / ÀC M Â M/M 0 applies, where M 0 is the molecular weight of the monomer.…”

“…[17] The conditions required to carry out determination of hk tr,M i by emulsion polymerization in this manner have been described by Tobita and Shiozaki. [13] An overview of this background theory to the method and its application to the BMA system is given in the Appendix. In this work, a number of poly(BMA) and polystyrene seeds of different sizes were employed over a range of temperatures (40-70 8C) to estimate empirical Arrhenius parameters A and E A for hk tr,M i.…”

Open channel hydraulics, 2nd edition

“…In this article, the emulsion polymerization of ethylene is simulated with the MC method proposed earlier,9 and this hypothesis, that the sharp peak at a high MW is formed by the limited volume effect, is examined.…”