Ch ical chemistr Reaction Kinetic Free-Radical polymerizations Chain polymerization Results in the rapid growth of an individual polymer chain for each activated monomer, and often occurs by a radical chain process Let and m stand for the initiator and monomer (a)Initiation ki 72I R● R●+M一 ka>RM· (b)Propagation M+M1 ● M+Mn-1 ● (c) Termination·Mn+·M mm m+n6 Free-Radical Polymerizations Physical Chemistry Let I and M stand for the initiator and monomer I ⎯⎯→ R• i k 2 R•+M ⎯⎯→RM • a k 1 2 1 M M M p k + • ⎯⎯→• m n k Mn Mm ⎯⎯t→M + • +• m = 0,1,2,  , n = 0,1,2,  Chain polymerization Results in the rapid growth of an individual polymer chain for each activated monomer, and often occurs by a radical chain process. (a) Initiation (b) Propagation (c) Termination 2 3 2 M M M p k + • ⎯ ⎯→• n k M Mn M p n + • ⎯⎯⎯→• − − , 1 1  Reaction Kinetics