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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...

Base-Catalyzed Ring-Opening of Epoxides

Base-Catalyzed Ring-Opening of Epoxides

Due to their highly strained structures, epoxides can readily undergo ring-opening reactions through nucleophilic substitution, either in the presence of an acid or a base. The nucleophilic substitution reactions in the presence of acid are called acid-catalyzed ring-opening reactions, and nucleophilic substitution reactions in the presence of a base are called base-catalyzed ring-opening reactions. Epoxides undergo base-catalyzed ring-opening reactions in the presence of a strong nucleophile...

Olefin Metathesis Polymerization: Overview

Olefin Metathesis Polymerization: Overview

Recently, the development of olefin metathesis polymerization advanced the field of polymer synthesis. Simply put, the reorganization of substituents on their double bonds between two olefins in the presence of a catalyst is known as the olefin metathesis reaction. The use of metathesis reaction for polymer synthesis is called olefin metathesis polymerization.
Ruthenium-based Grubbs catalyst is the most commonly used catalyst for olefin metathesis polymerization. Grubbs catalyst consists of a...

Acid-Catalyzed Ring-Opening of Epoxides

Acid-Catalyzed Ring-Opening of Epoxides

Epoxides that are three-membered ring systems are more reactive than other cyclic and acyclic ethers. The high reactivity of epoxides originates from the strain present in the ring. This ring strain acts as a driving force for epoxides to undergo ring-opening reactions either with halogen acids or weak nucleophiles in the presence of mild acid. The acid catalyst converts the epoxide oxygen, a poor leaving group, into an oxonium ion, a better leaving group, making the reaction feasible. The...

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)

Acyclic diene metathesis polymerization or ADMET polymerization involves cross-metathesis of terminal dienes, such as 1,8-nonadiene, to give linear unsaturated polymer and ethylene. As ADMET is a reversible process, the formed ethylene gas must be removed from the reaction mixture to complete the polymerization process.
Similar to cross-metathesis, ADMET also involves the formation of metallacyclobutane intermediate by [2+2] cycloaddition of one of the double bonds of a terminal diene with...

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta Chain-Growth Polymerization: Overview

Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta catalyst, high molecular...

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

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Published on: November 21, 2017

Recent developments in enzyme-catalyzed ring-opening polymerization.

Ann-Christine Albertsson¹, Rajiv K Srivastava

¹Fibre and Polymer Technology, School of Chemical Science and Engineering, Teknikringen 56-58, Royal Institute of Technology, KTH, SE 100 44, Stockholm, Sweden. aila@polymer.kth.se

Advanced Drug Delivery Reviews

|April 15, 2008

Summary

Enzymes offer eco-friendly polymerization but face challenges like high cost and low molecular weight polymers. Overcoming these is key for industrial enzyme-catalyzed polymerization applications.

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Area of Science:

Biocatalysis
Polymer Chemistry
Green Chemistry

Background:

Enzymes are increasingly used as sustainable catalysts for polymerization, offering an alternative to traditional metal-based systems.
Their natural origin, mild reaction conditions, high selectivity, and recyclability present significant advantages over organometallic catalysts.

Purpose of the Study:

To review enzyme-catalyzed ring-opening polymerization of various monomers.
To focus on the molecular weight of polymers synthesized via enzyme catalysis.
To assess the potential for industrial scale-up of enzyme-catalyzed polymerization techniques.

Main Methods:

Literature review of enzyme-catalyzed ring-opening polymerization.
Analysis of polymer molecular weights achieved in enzymatic polymerization processes.
Discussion of limitations and future directions for enzyme catalysis in polymer synthesis.

Main Results:

Enzyme catalysis provides environmentally advantageous polymerization but is often limited by high enzyme costs and low polymer molecular weights.
Current enzyme-catalyzed polymerization techniques are nascent for producing industrially viable polymeric materials.
The molecular weight of polymers synthesized via enzyme catalysis remains a critical factor for end-application suitability.

Conclusions:

Enzyme-catalyzed polymerization offers a green alternative but requires further development to achieve high molecular weights.
Addressing challenges such as enzyme cost and quantity is crucial for industrial adoption.
Enhancing polymer molecular weight is essential for enzyme catalysis to meet commercial demands.