Block copolymers by transformation of living anionic polymerization into controlled/“living” atom transfer radical polymerization

Acar, Metin H.; Matyjaszewski, Krzysztof

doi:10.1002/(sici)1521-3935(19990501)200:5<1094::aid-macp1094>3.3.co;2-9

Cited by 32 publications

(51 citation statements)

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“…Multifunctional initiators were used in the process to prepare ABA or AB‐star multiarmed block copolymers . Macroinitiators can be prepared by any polymerization process including free radical polymerization (FRP) and other controlled polymerization processes such as cationic, anionic, RAFT, cationic ring‐opening polymerization (CROP), ring‐opening metathesis polymerization (ROMP), anionic ring‐opening polymerization (AROP), condensation, and postmetallocene catalysis, as long as at least one terminal functionality is, or can be converted to, an ATRP initiating moiety. Many catalyst/initiation systems can be employed in the second ATRP chain extension step.…”

Section: Control Of Macromolecular Architecturementioning

confidence: 99%

Advanced Materials by Atom Transfer Radical Polymerization

2018

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Atom transfer radical polymerization (ATRP) has been successfully employed for the preparation of various advanced materials with controlled architecture. New catalysts with strongly enhanced activity permit more environmentally benign ATRP procedures using ppm levels of catalyst. Precise control over polymer composition, topology, and incorporation of site specific functionality enables synthesis of well-defined gradient, block, comb copolymers, polymers with (hyper)branched structures including stars, densely grafted molecular brushes or networks, as well as inorganic-organic hybrid materials and bioconjugates. Examples of specific applications of functional materials include thermoplastic elastomers, nanostructured carbons, surfactants, dispersants, functionalized surfaces, and biorelated materials.

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Section: Control Of Macromolecular Architecturementioning

confidence: 99%

Advanced Materials by Atom Transfer Radical Polymerization

2018

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“…Techniques such as atom‐transfer radical polymerization (ATRP), reversible addition‐fragmentation chain‐transfer (RAFT) polymerization, and nitroxide‐mediated radical polymerization (NMP) can be employed to achieve the desired taper profile between the blocks . For example, inspired by the work of Matyjaszewski and coworkers, the Epps group applied a combination of anionic polymerization and ATRP to make a tapered triblock copolymer composed of isoprene, styrene, and methyl methacrylate monomer segments . First, P(I‐IS‐S) was synthesized anionically and terminated with a single ethylene oxide repeat (providing a hydroxyl end group).…”

Section: Bulk Polymer Interfacial Modifications In Self‐assembled Sysmentioning

confidence: 99%

Tuning Block Polymer Structure, Properties, and Processability for the Design of Efficient Nanostructured Materials Systems

Morris

Gartner

Epps

2017

Macro Chemistry & Physics

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Block polymers (BPs) are ideal building blocks for nanoporous membranes, microelectronics templates, energy storage devices, and other technologies. For these systems, precise control over morphology, properties, and processability are essential to optimize performance. The Epps group has used a multidisciplinary approach to control BP nanostructure ordering and orientations, order-disorder and glass transition temperatures, and mechanical and transport properties through the informed manipulation of BP effective segregation strengths and interfacial energetics. For example, alterations in macromolecular interactions between BP chains were achieved through the introduction of composition gradients between copolymer blocks or by adding dopants. In thin films, high-throughput approaches were designed to modify and characterize substrate-polymer interactions, and solvent annealing techniques were developed to facilitate nanoscale alignment and ordering. By manipulating BP interfacial energetics to gain exquisite tunability of nanostructures and materials' properties, the group is accelerating the development of next-generation BPs that will be harnessed to fabricate inexpensive, efficient, and high-performance devices.

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“…Transformation between living polymerization methods can take place by introducing a functional group, which can be initiated at the chain end. Various studies have been conducted relating to conversion of the chain ends …”

Section: Introductionmentioning

confidence: 99%

Poly(styrene‐r‐butadiene)‐b‐poly(poly(ethylene glycol) methyl ether methacrylate) as a silica dispersant in rubber compounds

Lee

Kım

et al. 2013

Polymer International

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To improve the dispersion of silica in silica-filled styrene-butadiene rubber tire tread compounds, we synthesized poly(styrener-butadiene)-b-poly(poly(ethylene glycol) methyl ether methacrylate) (p(SB-b-PEGMA)) as a silica dispersant. p(SB-b-PEGMA) was synthesized by combining living anionic polymerization (LAP) and atom transfer radical polymerization (ATRP). Initially, αbromoisobutyryl-terminated poly(styrene-r-butadiene) (pSB-Br) was prepared by LAP of styrene and butadiene and sequential additions of ethylene oxide and α-bromoisobutyryl bromide. pSB-Br was then used as the macroinitiator in the ATRP of PEGMA (M n = 300 g mol −1 ). The structure of p(SB-b-PEGMA) was characterized using gel permeation chromatography and 1 H NMR spectroscopy. The application of p(SB-b-PEGMA) as a silica dispersant in styrene-butadiene rubber/silica decreased the optimal vulcanization time and improved the mechanical properties, which included 100% and 300% moduli, crosslinking density and silica dispersion.

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Block copolymers by transformation of living anionic polymerization into controlled/“living” atom transfer radical polymerization

Cited by 32 publications

References 0 publications

Advanced Materials by Atom Transfer Radical Polymerization

Advanced Materials by Atom Transfer Radical Polymerization

Tuning Block Polymer Structure, Properties, and Processability for the Design of Efficient Nanostructured Materials Systems

Poly(styrene‐r‐butadiene)‐b‐poly(poly(ethylene glycol) methyl ether methacrylate) as a silica dispersant in rubber compounds

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