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Chap._200013 - 1/2[I 1 Mn[M Mn These general trends are...

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Kinetic chain length ( ): the average number of monomer molecules consumed (polymerized) per each initiator. = R p R i R p R t = = k p [M] 2 f k d [I] f k d [I] k t 1/2 k p [M] 2 (f k d k t ) [I] 1/2 1/2 = Degree of polymerization (X n ): the average number of monomers in each dead polymer chain. termination by coupling terminal by disproportionation X n = 2 X n = Number average molecular weight (M n ) M n = M o X n (M o : molecular weight of monomer) The molecular weight of polymer is proportional to monomer concentration, but is inversely proportional to square root of initiator concentration
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Unformatted text preview: 1/2 [I] 1 Mn [M] Mn These general trends are true not only to free radical polymerization but also to most of cationic and transition metal coordination polymerization, in which the initiation, propagation and termination reaction are simultaneously taken place during the batch polymerization process (reaction time) or polymer yield Mn number of polymer chains 50 100 monomer conversion * “Living” Anionic Polymerization with fast initiation and no termination...
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