Auto-accelerating chain-branched

It was shown that there are three main phases of the process (see Fig. 3). A very short initial phase is an auto-accelerating chain-branched reaction the total concentration of chain carriers vs. time follows an S-shape curve, which is... [Pg.189]

Auto acceleration at relatively high conversion can also be caused by formation of fi"ee radicals from the polymer that has been produced (Woods and Pikaev 1994). The yield of radicals from the polymer, which is usually a saturated chain, maybe higher than the yield from the unsaturated monomer leading to an increase in the rate of polymerization due to the increased radical population. Termination reactions of these radicals with chain-end radicals give rise to branched chains (graft homopolymer), while self-termination of mid-chain radicals brings about cross-links. [Pg.1304]

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