Anionic Living Polymerization
Anionic Living Polymerization - Related Videos
01:20
Anionic Chain-Growth Polymerization: Overview
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2023
The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...
01:04
Anionic Chain-Growth Polymerization: Mechanism
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2023
The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.
10:53
Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions
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Cited by 2 •
2016
The key steps of living anionic polymerization of phenyl glycidyl ether (PheGE) on methoxy-polyethylene glycol (mPEG-b-PPheGE) are described. The resulting block copolymer micelles (BCMs) were loaded with doxorubicin 14% (wt%) and sustained release of drug over 4 days under physiologically relevant conditions was obtained.
06:45
Polymerization
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2023
Source: Vy M. Dong and Jan Riedel, Department of Chemistry, University of California, Irvine, CA Polymers are made from macromolecules, which are composed of repeating units (the so called monomeric units). In our modern world, polymers play an important role. One of the first important polymers was nylon, which is a polyamide. It found widespread application in tooth brushes and stockings.
10:01
Kinetics of Addition Polymerization to Polydimethylsiloxane
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2023
Source: Kerry M. Dooley and Michael G. Benton, Department of Chemical Engineering, Louisiana State University, Baton Rouge, LA Polymers are molecules consisting of many repeating monomer units that are chemically bonded into long chains. They exhibit a broad range of physical properties, which are affected by their chemical structure, molecular weight and degree of polymerization. The polymer industry manufactures thousands of raw materials used in a broad variety of commercial products.1,2 The...
FAQs
An initiator, often an organolithium compound, generates the reactive carbanion that begins chain growth. That anionic chain end then adds to suitable vinyl monomers, establishing the active site from which the polymer chain extends. Because the initiating step determines where growth starts, initiator choice is central to controlling the resulting molecular architecture and end-group functionality.
Rigorously dry, oxygen-free conditions help preserve the active anionic chain ends. Their importance follows from the requirement that chains continue growing without termination or transfer. Maintaining these conditions allows monomer addition to proceed until the monomer is consumed, supporting predictable control of molecular weight, dispersity, and end-group functionality.
Control comes from retaining active chain ends while monomer is available. Repeated addition at those sites lets researchers adjust molecular weight and dispersity rather than relying only on uncontrolled chain growth. The same control supports deliberate adjustment of block composition and end-group functionality, producing polymers with molecular architectures suited to specific material or biological objectives.
Suitable vinyl monomers are the immediate substrates for repeated addition at the anionic chain end. Their selection therefore affects how chains are built and which molecular architectures can be targeted. In this context, monomer choice is relevant to adjusting block composition and designing polymers whose structure is appropriate for later biological applications.
The workflow begins by combining an initiator with a suitable vinyl monomer under rigorously dry, oxygen-free conditions. The initiator forms a carbanion, and repeated monomer addition extends the chain. Once the monomer is consumed, the resulting controlled polymer can be used according to its targeted molecular weight, dispersity, architecture, or end-group functionality.
Tailored polymers from this method can support biomaterials, model membranes, drug-delivery systems, and other materials studied in biology-related research. Their value comes from controlling features such as molecular architecture, block composition, and end-group functionality. These structural properties matter because the chemical structure of a material influences how it participates in biological interactions.