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Characteristics and Nomenclature of Copolymers

Characteristics and Nomenclature of Copolymers

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...

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

Olefin Metathesis Polymerization: Ring-Opening Metathesis Polymerization (ROMP)

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...

Anionic Chain-Growth Polymerization: Overview

Anionic Chain-Growth Polymerization: Overview

The polymerization process that involves carbanion as an intermediate is called anionic polymerization. It is also a type of addition or chain-growth polymerization. Anionic polymerization gets initiated by a strong nucleophile such as an organolithium or a Grignard reagent. The most commonly used initiator for anionic polymerization is butyl lithium. Monomers involved in anionic polymerization must possess a vinyl group bonded to one or two electron-withdrawing groups. For instance,...

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,...

Anionic Chain-Growth Polymerization: Mechanism

Anionic Chain-Growth Polymerization: Mechanism

The mechanism for anionic chain-growth polymerization involves initiation, propagation, and termination steps. In the initiation step, a nucleophilic anion, such as butyl lithium, initiates the polymerization process by attacking the π bond of the vinylic monomer. As a result, a carbanion, stabilized by the electron‐withdrawing group, is generated. The resulting carbanion acts as a Michael donor in the propagation step and attacks the second vinylic monomer, which acts as a Michael acceptor.

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...

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Updated: May 25, 2026

Controlled Photoredox Ring-Opening Polymerization of O-Carboxyanhydrides Mediated by Ni/Zn Complexes

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Published on: November 21, 2017

Block copolypeptides prepared by N-carboxyanhydride ring-opening polymerization.

Gijs J M Habraken¹, Andreas Heise, Paul D Thornton

¹Laboratory of Polymer Chemistry,Eindhoven University of Technology, Den Dolech 2, P.O. Box 513, 5600 MB Eindhoven, The Netherlands.

Macromolecular Rapid Communications

|February 1, 2012

Summary

N-Carboxyanhydride ring-opening polymerization (NCA ROP) enables precise synthesis of polypeptides and block copolypeptides. This versatile method allows for creating novel materials with diverse applications by controlling molecular weight and properties.

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Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Anionic Polymerization of an Amphiphilic Copolymer for Preparation of Block Copolymer Micelles Stabilized by π-π Stacking Interactions

Published on: October 10, 2016

Area of Science:

Polymer Chemistry
Materials Science
Organic Synthesis

Background:

N-Carboxyanhydride ring-opening polymerization (NCA ROP) is a key method for synthesizing polypeptides.
Control over polymerization is essential for producing polypeptides with desired characteristics.
Block copolypeptides offer unique functionalities and properties by combining different polypeptide blocks.

Purpose of the Study:

To review contemporary synthetic approaches for NCA ROP.
To highlight diverse block copolypeptide architectures generated using NCA ROP.
To showcase the wide-ranging applicability of NCA ROP-derived materials.

Main Methods:

Utilizing N-Carboxyanhydride ring-opening polymerization (NCA ROP) for homopolypeptide synthesis.
Employing sequential NCA ROP for the creation of block copolypeptides.
Controlling polymerization to achieve targeted molecular weights and minimize side reactions.

Main Results:

Highly monodisperse synthetic polypeptides can be produced with precise molecular weight control.
Block copolypeptides with distinct functionalities and secondary structures are achievable.
Novel materials with broad applicability have been generated through NCA ROP.

Conclusions:

NCA ROP is a powerful and versatile technique for polypeptide synthesis.
Sequential NCA ROP allows for the rational design of complex block copolypeptide architectures.
The resulting materials hold significant potential for various applications.