“…This block copolymer formation proved to be a general procedure and permitted a wide compositional range of polystyrene- b -poly(isoprene) block copolymers to be prepared with accurate control of molecular weight up to 105 000 amu and polydispersities typically in the range of 1.13−1.20 (Table ). The advantage of greater availability and a significantly greater tolerance of functional groups suggest a number of potential technological applications for these novel materials. − 4 4 Comparison of GPC traces for (a) the starting poly( tert -butyl acrylate) polymer, 5 , and (b) the poly( tert -butyl acrylate)- b -polyisoprene block copolymer, 6 , obtained after chain extension with isoprene.…”
The living free radical polymerization of 1,3-dienes, such as isoprene and 1,3-butadiene,
has been shown to be a facile process in the presence of alkoxyamine initiators based on a 2,2,5-trimethyl-4-phenyl-3-azahexane-3-oxy, 2, skeleton. These α-hydrido nitroxide derivatives were able to control the
homopolymerization to high conversion and molecular weights from 1000 to 100 000 amu with
polydispersities of 1.06−1.15 readily obtained. Block and random copolymers based on combinations of
1,3-dienes with a variety of functionalized vinyl monomers, such as styrene, acrylate, or methacrylate
derivatives, could also be prepared with similar control. In comparison with 2,2,6,6-tetramethylpiperidinoxy (TEMPO), these new systems represent a dramatic improvement in the ability to control the
polymerization of 1,3-dienes and further demonstrate the versatility of nitroxide-mediated living free
radical procedures.
“…This block copolymer formation proved to be a general procedure and permitted a wide compositional range of polystyrene- b -poly(isoprene) block copolymers to be prepared with accurate control of molecular weight up to 105 000 amu and polydispersities typically in the range of 1.13−1.20 (Table ). The advantage of greater availability and a significantly greater tolerance of functional groups suggest a number of potential technological applications for these novel materials. − 4 4 Comparison of GPC traces for (a) the starting poly( tert -butyl acrylate) polymer, 5 , and (b) the poly( tert -butyl acrylate)- b -polyisoprene block copolymer, 6 , obtained after chain extension with isoprene.…”
The living free radical polymerization of 1,3-dienes, such as isoprene and 1,3-butadiene,
has been shown to be a facile process in the presence of alkoxyamine initiators based on a 2,2,5-trimethyl-4-phenyl-3-azahexane-3-oxy, 2, skeleton. These α-hydrido nitroxide derivatives were able to control the
homopolymerization to high conversion and molecular weights from 1000 to 100 000 amu with
polydispersities of 1.06−1.15 readily obtained. Block and random copolymers based on combinations of
1,3-dienes with a variety of functionalized vinyl monomers, such as styrene, acrylate, or methacrylate
derivatives, could also be prepared with similar control. In comparison with 2,2,6,6-tetramethylpiperidinoxy (TEMPO), these new systems represent a dramatic improvement in the ability to control the
polymerization of 1,3-dienes and further demonstrate the versatility of nitroxide-mediated living free
radical procedures.
scite is a Brooklyn-based organization that helps researchers better discover and understand research articles through Smart Citations–citations that display the context of the citation and describe whether the article provides supporting or contrasting evidence. scite is used by students and researchers from around the world and is funded in part by the National Science Foundation and the National Institute on Drug Abuse of the National Institutes of Health.
