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Chain transfer by addition‐substitution mechanism, 4 . Alkyl permethacrylates — a new class of polymerization regulators
Author(s) -
Chaumont Philippe,
Colombani Daniel
Publication year - 1995
Publication title -
macromolecular chemistry and physics
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.57
H-Index - 112
eISSN - 1521-3935
pISSN - 1022-1352
DOI - 10.1002/macp.1995.021960322
Subject(s) - chemistry , chain transfer , polymer chemistry , homolysis , reaction rate constant , polymerization , activation energy , thermal decomposition , alkyl , arrhenius plot , radical polymerization , transfer agent , arrhenius equation , living polymerization , kinetics , polymer , organic chemistry , radical , physics , quantum mechanics
tert ‐Butyl permethacrylate ( t BPM) Systematic names; t BPM: tert ‐butyl peroxymethacrylate, CPM: α,α‐dimethylbenzyl peroxymethacrylate. and cumyl permethacrylate (CPM) b act as chain transfer agents in the free radical polymerization of methyl methacrylate and styrene at 50°C. Thermal degradation of the peresters occurs as a side‐reaction during the polymerization process. A modified Mayo equation (including the first‐order decomposition of the chain transfer agents) is proposed to calculate the chain transfer constants. The thermolysis activation energy of CPM ( E a,th = 121 ± 5kJ/mol) was estimated from the Arrhenius plot of the homolytic decomposition rate constants, K th' at various temperatures.