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Characteristics and Nomenclature of Copolymers

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Copolymers are the products obtained from the polymerization of multiple monomer species. So, in a polymer chain itself, there can be multiple repeating units that come from different monomers. The process of synthesizing a polymer from different monomer species is called copolymerization. When two monomers are involved, the polymer is known as a bipolymer. Polymers with three and four monomers are termed terpolymers and quaterpolymers, respectively. Figure 1 depicts the copolymerization of...

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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.
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Polymers

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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,...

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Ring-opening metathesis polymerization or ROMP involves strained cycloalkenes as starting materials. The mechanism of ROMP proceeds by reacting cycloalkene with Grubbs catalyst to give metallacyclobutane intermediate which undergoes a ring-opening reaction to form new carbene. The new carbene reacts with another molecule of cycloalkene. Repetition of these steps leads to the formation of an unsaturated open-chain polymer product. All these steps are reversible, however, relieving the ring...

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Facile and Efficient Preparation of Tri-component Fluorescent Glycopolymers via RAFT-controlled Polymerization

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Block copolymers containing organic semiconductor segments by RAFT polymerization.

Ming Chen¹, Matthias Häussler, Graeme Moad

¹CSIRO Materials Science and Engineering, Bag 10, Clayton South, Victoria, Australia. graeme.moad@csiro.au

Organic & Biomolecular Chemistry

|July 13, 2011

Summary

Researchers explored synthesizing block copolymers with organic semiconductor segments using RAFT polymerization. A novel method creates these copolymers linked by a stable, non-hydrolysable bond.

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Area of Science:

Polymer Chemistry
Organic Electronics
Materials Science

Background:

Block copolymers are crucial for advanced materials.
Organic semiconductors like polythiophene and perylene diimide offer unique electronic properties.
Controlled polymerization techniques are needed to precisely synthesize complex polymer architectures.

Purpose of the Study:

To explore synthesis methods for block copolymers incorporating organic semiconductor segments.
To develop a reliable method for creating block copolymers with specific linkages.
To enable the creation of novel materials for organic electronics.

Main Methods:

Reversible Addition-Fragmentation chain Transfer (RAFT) polymerization was employed.
A vinyl derivative was transformed into a macro-RAFT agent.
This macro-RAFT agent was used to initiate the polymerization of other monomers.

Main Results:

Successful synthesis of block copolymers containing polythiophene and perylene diimide segments.
Demonstrated a method to join polymer blocks via a short, non-hydrolysable linkage.
The resulting block copolymers possess well-defined architectures.

Conclusions:

RAFT polymerization is a viable approach for synthesizing organic semiconductor block copolymers.
The developed transformation method offers precise control over block copolymer structure and linkage.
These novel block copolymers hold potential for applications in organic electronics.