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Propagation and termination processes in free radical copolymerization
Author(s) -
Fukuda Takeshi,
Ide Nobuhiro,
Ma YungDae
Publication year - 1996
Publication title -
macromolecular symposia
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.257
H-Index - 76
eISSN - 1521-3900
pISSN - 1022-1360
DOI - 10.1002/masy.19961110127
Subject(s) - copolymer , reactivity (psychology) , monomer , constant (computer programming) , simple (philosophy) , polymer chemistry , basis (linear algebra) , reaction rate constant , thermodynamics , unit (ring theory) , materials science , chemistry , computational chemistry , kinetics , physics , mathematics , organic chemistry , computer science , classical mechanics , polymer , philosophy , medicine , alternative medicine , geometry , epistemology , pathology , mathematics education , programming language
The propagation and termination processes in free radical copolymerization were discussed on the basis of current experimental data. It was shown that the penultimate unit effect (PUE) in propagation is very general, affecting not only the absolute values of the rate constant but also the monomer reactivity ratios r 1 and r 2 . The analysis suggests that the alternating index r 1 r 2 originates in the PUE. An adequate description of the termination process also requires a penultimate model, which leads to a general, yet simple two‐parameter rate‐of‐copolymerization equation with PUEs in both propagation and termination.