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Related Concept Videos

Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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,...
Polymer Classification: Architecture01:14

Polymer Classification: Architecture

Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
Radical Chain-Growth Polymerization: Chain Branching01:17

Radical Chain-Growth Polymerization: Chain Branching

The skeletal structure of polymers synthesized via radical polymerization is always branched. For example, the polymerization of ethylene by radical polymerization results in a low-density grade of polyethylene with a heavily branched skeletal structure. Here, the radical site abstracts hydrogen from the growing chain, and the radical site shifts from the end (a primary carbon center) to anywhere within the growing chain (a secondary carbon center). Consequently, the part of the chain from the...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

Step-growth or condensation polymerization is a stepwise reaction of bi or multifunctional monomers to form long-chain polymers. As all the monomers are reactive, most of the monomers are consumed at the early stages of the reaction to form small chains of reactive oligomers, which then combine to form long polymer chains in the late stages. Hence, the reaction has to proceed for a long time to achieve high molecular weight polymers.
Many natural and synthetic polymers are produced by...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.

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Hyperbranched (Meth)acrylates in Solution, Melt, and Grafted From Surfaces.

Hideharu Mori1, Axel H E Müller

  • 1Makromolekulare Chemie II, Bayreuther Institut für Makromolekülforschung and Bayreuther Zentrum für Kolloide und Grenzflächen , Universität Bayreuth, Bayreuth, 95440, Germany.

Topics in Current Chemistry
|December 7, 2010
PubMed
Summary

This review covers hyperbranched (meth)acrylates, focusing on self-condensing vinyl polymerization for synthesis. It explores molecular parameters, solution/melt properties, and novel surface/nanoparticle applications.

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Area of Science:

  • Polymer Chemistry
  • Materials Science

Background:

  • Hyperbranched polymers offer unique properties compared to linear analogues.
  • Traditional polymerization methods face challenges in controlling hyperbranched architectures.

Purpose of the Study:

  • To review recent advancements in synthesizing and characterizing hyperbranched (meth)acrylates.
  • To highlight self-condensing vinyl polymerization as a key synthetic strategy.
  • To discuss the properties and applications of these polymers.

Main Methods:

  • Focus on self-condensing vinyl (co)polymerization for hyperbranched polymer synthesis.
  • Theoretical analysis of molecular parameters.
  • Review of solution and melt properties.
  • Description of novel synthetic concepts for polymer brushes.

Main Results:

  • Self-condensing vinyl (co)polymerization is an effective route to hyperbranched polymers.
  • Molecular parameters can be theoretically understood.
  • Hyperbranched poly(meth)acrylates and poly(acrylic acid)s exhibit distinct solution and melt behaviors.
  • New methods enable preparation of hyperbranched polymer brushes.

Conclusions:

  • Self-condensing vinyl polymerization provides controlled synthesis of hyperbranched (meth)acrylates.
  • Understanding molecular parameters is crucial for property prediction.
  • Hyperbranched polymers show promise for surface and nanoparticle functionalization.