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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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...
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...
Types of Step-Growth Polymers: Polyesters01:20

Types of Step-Growth Polymers: Polyesters

The introduction of polyesters has brought major development to the textile industry. The wrinkle-free behavior of polyester blends has eliminated the need for starching and ironing clothes.
Polyesters are commonly prepared from terephthalic acid and ethylene glycol; the crude product is known as poly(ethylene terephthalate) or PET. However, polyesters are synthesized industrially by transesterification of dimethyl terephthalate with ethylene glycol at 150 °C. The two reactants and the polymer...
Determination of Molar Masses of Polymers I01:24

Determination of Molar Masses of Polymers I

Polymerization produces macromolecules with a range of chain lengths due to the random nature of molecular growth processes. As chains form and terminate at different stages, a single polymer sample contains molecules of varying sizes rather than a uniform structure. This variability is described using average molar masses and distribution-related parameters, which together provide a comprehensive understanding of polymer characteristics.The distribution of molar masses plays a critical role in...

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Star-Like Microgels vs Star Polymers: Similarities and Differences.

Tommaso Papetti1,2, Elisa Ballin1,2, Francesco Brasili2,1

  • 1Department of Physics, Sapienza University of Rome, Piazzale Aldo Moro 2, Roma 00185, Italy.

Macromolecules
|June 1, 2026
PubMed
Summary
This summary is machine-generated.

Star-like microgels behave like star polymers, exhibiting ultrasoft properties due to their unique internal structure. This finding, established through simulations, suggests new possibilities for using these thermoresponsive colloids at high concentrations.

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Area of Science:

  • Soft matter physics
  • Colloid science
  • Polymer physics

Background:

  • Star-like microgels are thermoresponsive colloids with architectures resembling star polymers.
  • Understanding their behavior is crucial for applications in materials science.

Purpose of the Study:

  • To theoretically establish the analogy between star-like microgels and star polymers using monomer-resolved simulations.
  • To characterize the properties of star-like microgels and compare them to standard microgels and star polymers.

Main Methods:

  • Extensive monomer-resolved simulations were performed.
  • Effective potentials between microgels were characterized.
  • The ratio of gyration to hydrodynamic radii was investigated across the volume-phase transition.
  • Bulk modulus was estimated.

Main Results:

  • The effective potential between star-like microgels follows a Gaussian, unlike the Hertzian potential of standard microgels.
  • The ratio of gyration to hydrodynamic radii aligns with star polymer behavior and experimental data.
  • Star-like microgels are significantly softer than standard microgels, comparable to star polymers.

Conclusions:

  • Star-like microgels behave as ultrasoft particles, analogous to star polymers.
  • This behavior opens avenues for exploring star-like microgels at high concentrations.