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Related Concept Videos

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...
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...
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...
Radical Chain-Growth Polymerization: Mechanism01:09

Radical Chain-Growth Polymerization: Mechanism

The radical chain-growth polymerization mechanism consists of three steps: initiation, propagation, and termination of polymerization. The polymerization initiates when a free radical generated from the radical initiator adds to the unsaturated bond in the monomer. The unpaired electron of the free radical and one π electron in the unsaturated bond creates a σ bond between the free radical and the monomer. As a result, the other π electron in the unsaturated bond converts this species into the...
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
Radical Chain-Growth Polymerization: Overview01:10

Radical Chain-Growth Polymerization: Overview

Chain-growth or addition polymerization is successive addition reactions of monomers with a polymer chain. In radical chain-growth polymerization, the reaction proceeds via a free-radical intermediate. The free radical is formed from radical initiators, which spontaneously generate free radicals by homolytic fission. Organic peroxides (such as dibenzoyl peroxide, as shown in Figure 1) or azo compounds are popular radical initiators. A low concentration ratio of radical initiator to monomer is...

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Models for randomly hyperbranched polymers: Theory and simulation.

Dominik Konkolewicz1, Oliver Thorn-Seshold, Angus Gray-Weale

  • 1School of Chemistry F11, University of Sydney, New South Wales 2006, Australia.

The Journal of Chemical Physics
|August 14, 2008
PubMed
Summary
This summary is machine-generated.

Theoretical models accurately describe hyperbranched polymer structures in solution, validated by computer simulations. These models offer a realistic view of factors influencing polymer conformations.

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Area of Science:

  • Polymer Chemistry
  • Computational Chemistry
  • Materials Science

Background:

  • Hyperbranched polymers exhibit complex architectures.
  • Understanding their solution structures is crucial for applications.
  • Existing models may not fully capture their conformational behavior.

Purpose of the Study:

  • To develop and validate theoretical models for hyperbranched polymer structures in solution.
  • To assess the accuracy of these models against computer simulations.
  • To investigate the influence of solvent quality on polymer conformations.

Main Methods:

  • Derivation of theoretical models based on random assembly of structural units.
  • Validation of models using extensive computer simulations.
  • Inclusion of solvent quality effects at the mean-field level.

Main Results:

  • Theoretical models accurately predict radii of gyration and density profiles of hyperbranched polymers.
  • Models show good agreement with simulated conformations for both hyperbranched polymers and dendrimers.
  • The approach effectively captures the physical influences on polymer structures.

Conclusions:

  • The developed theoretical models provide a simple yet realistic framework for understanding hyperbranched polymer conformations.
  • The models are versatile, applicable to various branched polymer architectures.
  • This work advances the predictive capability for polymer solution behavior.