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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...

Types of Step-Growth Polymers: Polyesters

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...

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,...

Cationic Chain-Growth Polymerization: Mechanism

Cationic Chain-Growth Polymerization: Mechanism

The cationic polymerization mechanism consists of three steps: initiation, propagation, and termination. In the initiation step of the polymerization process, the π bond of a monomer gets protonated by the Lewis acid catalyst, which is formed from boron trifluoride and water. The protonation of the π bond generates a carbocation stabilized by the electron‐donating group. In the propagation step, the π bond of the second monomer acts as a nucleophile and attacks the generated carbocation,...

Radical Chain-Growth Polymerization: Overview

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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Related Experiment Video

Updated: May 21, 2026

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Macromolecules with Tunable Fluorescence via Photochemical Step-Growth Polymerization.

Harry Capper-Duffin¹, Lewis Chambers^1,2, James Blinco¹

¹Centre for Materials Science and School of Chemistry and Physics, Queensland University of Technology (QUT), 2 George Street, Brisbane, 4000 QLD, Australia.

ACS Macro Letters

|May 20, 2026

Summary

This summary is machine-generated.

Researchers developed novel fluorescent polymers with tunable emission by adjusting the ratio of monomer to excimer fluorescence. This breakthrough offers a straightforward method for creating unique polymer optical properties.

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Area of Science:

Polymer Chemistry
Materials Science
Photophysics

Background:

Fluorescent macromolecules are crucial for advanced optical materials.
Controlling fluorescence emission properties, such as monomer and excimer emission, is key for tailored applications.
Existing methods for modulating polymer fluorescence can be complex or limited in scope.

Purpose of the Study:

To introduce a new class of fluorescent polymers with tunable emission properties.
To demonstrate the control over monomer and excimer fluorescence ratios by adjusting polymer composition.
To establish a straightforward synthetic route for these novel macromolecules.

Main Methods:

Synthesis of fluorescent polymers via photochemical Diels-Alder step-growth polymerization.
Utilizing a bifunctional o-methyl benzaldehyde monomer and a bismaleimide-based pyrene monomer.
Characterization of polymer chain structure and fluorescence properties across varying monomer ratios.

Main Results:

Demonstrated successful synthesis of fluorescent polymers with modulated emission.
Established a direct correlation between pyrene unit density and the intensity of excimer emission relative to monomer emission.
Confirmed the controllability of excimer emission strength by altering monomer ratios within the polymer chain.

Conclusions:

A novel class of fluorescent polymers with tunable emission has been successfully synthesized.
The density of pyrene units in the polymer backbone effectively dictates the relative intensities of monomer and excimer fluorescence.
This straightforward synthetic approach enables the production of uniquely emitting polymers for diverse applications.