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Polymers

Polymers

The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...

Polymers: Molecular Weight Distribution

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.

Step-Growth Polymerization: Overview

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...

Molecular Weight of Step-Growth Polymers

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...

Determination of Molar Masses of Polymers I

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...

Determination of Molar Masses of Polymers II

Determination of Molar Masses of Polymers II

Polymer samples typically consist of macromolecular chains with a distribution of lengths, resulting in a range of molar masses rather than a single discrete value. Conventional descriptors such as the number-average molar mass and weight-average molar mass quantify this distribution but do not fully capture polymer behavior in solution..The viscosity-average molar mass provides a more realistic description of polymer behavior in solution because it accounts for the enhanced contribution of...

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Related Experiment Video

Updated: May 10, 2026

Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

Fabricating Superhydrophobic Polymeric Materials for Biomedical Applications

Published on: August 28, 2015

Comb polymers in dilute solutions: Analytical approach, computer simulations, and experiments.

Khristine Haydukivska¹, Viktoria Blavatska¹, Daniel Gromadzki²

¹Yukhnovskii Institute for Condensed Matter Physics of the National Academy of Sciences of Ukraine, 79011 Lviv, Ukraine.

Physical Review. E

|February 20, 2026

Summary

This summary is machine-generated.

We studied comb-like polymer structures in solution. Increasing side chain length significantly increases the polymer

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Area of Science:

Polymer Physics
Soft Matter Physics
Supramolecular Chemistry

Background:

Comb-like polymer topologies exhibit unique conformational properties.
Understanding these properties is crucial for designing advanced materials.

Purpose of the Study:

To analyze the universal conformational properties of comb-like polymers.
To investigate the influence of branching points, functionality, and relative polymerization degree on polymer size.

Main Methods:

Utilizing an analytical approach based on the continuous-chain model and polymer renormalization.
Employing coarse-grained molecular dynamics simulations.
Comparing theoretical and simulation results with experimental data.

Main Results:

Quantitatively estimating the increase in effective size with increasing relative polymerization degree.
Demonstrating good qualitative agreement between analytical results, simulations, and experimental data.
Analyzing the impact of branching points (n) and functionality (f) on polymer conformation.

Conclusions:

The study provides a comprehensive understanding of comb-like polymer conformations.
Results are applicable to monodisperse homopolymer combs.
This work bridges theoretical, computational, and experimental approaches in polymer science.