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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...

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Related Experiment Video

Updated: Jul 17, 2026

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels
11:34

Controlled Synthesis and Fluorescence Tracking of Highly Uniform Poly(N-isopropylacrylamide) Microgels

Published on: September 8, 2016

Dynamic scaling of polymer gels comprising nanoparticles.

A V Teixeira1, E Geissler, P Licinio

  • 1Universidade Federal de Viçosa, Departamento de Física, CCE, Av. P. H. Rolfs s/n - Campus - UFV, 36570-000 Viçosa, Brazil. alvaro@ufv.br

The Journal of Physical Chemistry. B
|January 12, 2007
PubMed
Summary

Dynamic light scattering reveals anomalous diffusion in polymer gels. A fractal Gaussian network model explains particle movement, transitioning from free to subdiffusive behavior over time.

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Area of Science:

  • Polymer Science
  • Soft Matter Physics
  • Materials Science

Background:

  • Soft polymer gels like poly(methyl-methacrylate) (PMMA) and polyacrylamide (PA) exhibit complex dynamics.
  • Understanding the movement of trapped particles within these gels is crucial for characterizing their mechanical properties.

Purpose of the Study:

  • To investigate the anomalous diffusivity of trapped particles in PMMA and PA polymer gels.
  • To analyze these dynamics using a fractal Gaussian network gel model.

Main Methods:

  • Dynamic Light Scattering (DLS) measurements were performed on polymer gels containing trapped latex spheres or magnetic nanoparticles.
  • Analysis involved calculating the scattered electric field correlation function and time-dependent diffusion coefficients.

Main Results:

  • Observed a transition from free diffusion at short times to anomalous subdiffusion at long times for trapped particles.
  • The transition time scaled with the scattering vector (q) as approximately q(-2).
  • All diffusion curves for various scattering vectors and samples scaled onto a single master curve.

Conclusions:

  • The fractal Gaussian network gel model successfully describes the anomalous diffusivity of trapped particles across the entire DLS probed time range.
  • The model accounts for both percolating and uniform bulk gel limits.
  • Results demonstrate the arrested displacement of particles in polymer gels over longer timescales.