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- W2146307154 abstract "Abstract The addition of propagating radicals of methyl acrylate (MA) and styrene (St) to CH 2 C(CO 2 CH 3 )CH 2 and CH 2 C(C 6 H 5 )CH 2 ω‐end groups of poly(methyl methacrylate) (PMMA) and polystyrene (PSt) was investigated. The end groups were as reactive as MA and St toward the poly(methyl acrylate) (PMA) and PSt radicals, respectively. The adduct radical derived from the two types of PMMA end groups and PMA radicals underwent β fragmentation exclusively to yield PMMA radicals and end groups bound to PMA chains. The addition of PSt radicals to PMMA with CH 2 C(CO 2 Me)CH 2 end groups resulted in adduct radicals that underwent β fragmentation and addition to St or coupling with PSt radicals. Adduct radicals formed by the addition of PMA radicals to both types of end groups of PSt exclusively formed CC bond by coupling with PMA radicals to form branched structures or by addition to MA monomer to give a copolymer. The fate of the adduct radicals was highly dependent on the type of polymer chain and the substituent bound to the end group. Steric congestion of the adduct radical arising from the α‐methyl group of the PMMA chain was considered to be crucial for fragmentation to expel the PMMA radical. © 2003 Wiley Periodicals, Inc. J Polym Sci Part A: Polym Chem 41: 645–654, 2003" @default.
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- W2146307154 date "2003-01-16" @default.
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- W2146307154 title "Substituted propenyl end groups as reactive intermediates in radical polymerization" @default.
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- W2146307154 doi "https://doi.org/10.1002/pola.10587" @default.
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