ATRP−RCM Synthesis of Cyclic Diblock Copolymers
2008; American Chemical Society; Volume: 41; Issue: 21 Linguagem: Inglês
10.1021/ma801363n
ISSN1520-5835
AutoresK. Adachi, Satoshi Honda, Shotaro Hayashi, Yasuyuki Tezuka,
Tópico(s)Fuel Cells and Related Materials
ResumoA versatile synthetic means for cyclic diblock copolymers has been developed by the combination of atom transfer radical polymerization (ATRP) and ring-closing metathesis (RCM) techniques. Thus, first, an A−B type allyl-telechelic diblock copolymer comprised of two different acrylate ester segments, i.e., poly(methyl acrylate)-b-poly(n-butyl acrylate), poly(MA)-b-poly(BA), was prepared via the ATRP of MA, followed by the addition of the second monomer, BA, with allyl bromide as an initiator and with allyltributylstannane as an end-capping reagent, respectively. Alternatively, an A−B−A type allyl-telechelic triblock copolymer comprised of poly(BA) and poly(ethylene oxide), poly(EO), segments was prepared via the ATRP of BA using a poly(EO) macroinitiator having 2-bromoisobutyryl end groups, followed by the end-capping reaction with allyltributylstannane. The subsequent RCM of the allyl-telechelic block copolymers under dilution in the presence of Grubbs catalyst could afford the corresponding A−B type cyclic diblock copolymers.
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