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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,...

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...

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...

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...

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...

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Related Experiment Video

Updated: Feb 21, 2026

A Facile and Eco-friendly Route to Fabricate PolyLactic Acid Scaffolds with Graded Pore Size

A Facile and Eco-friendly Route to Fabricate PolyLactic Acid Scaffolds with Graded Pore Size

Published on: October 17, 2016

[Recent advances in nucleating agents used for poly (lactic acid)].

Zhiyang Liu¹, Yunxuan Weng¹, Zhigang Huang¹

¹School of Materials Science and Mechanical Engineering, Beijing Technology and Business University, Beijing 100048, China.

Sheng Wu Gong Cheng Xue Bao = Chinese Journal of Biotechnology

|October 12, 2017

Summary

Adding nucleating agents to poly (lactic acid) (PLA) can improve its heat resistance. This review covers organic and inorganic agents for enhancing PLA crystallinity and thermal properties.

Keywords:

crystallisation heat resistant property nucleating agent poly (lactic acid) (PLA)progress

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Area of Science:

Polymer Science
Materials Science
Chemical Engineering

Background:

Poly (lactic acid) (PLA) is a biocompatible and biodegradable polymer widely used in various applications.
Industrial-scale PLA production primarily utilizes L-lactic acid, yielding transparent materials with limited heat resistance.

Purpose of the Study:

To review the advancements in utilizing nucleating agents to enhance the properties of poly (lactic acid).
To explore the effectiveness of both organic and inorganic nucleating agents in improving PLA's heat resistance.

Main Methods:

Literature review of scientific research on poly (lactic acid) and nucleating agents.
Analysis of studies focusing on the synthesis and modification of PLA.
Evaluation of the impact of nucleating agents on PLA crystallinity and thermal properties.

Main Results:

Nucleating agents significantly increase the crystallinity of poly (lactic acid).
Enhanced crystallinity directly correlates with improved heat resistance in PLA materials.
Both organic and inorganic nucleating agents have demonstrated efficacy in modifying PLA.

Conclusions:

The incorporation of nucleating agents is a viable strategy to overcome the poor heat resistance of poly (lactic acid).
Further research into organic and inorganic nucleating agents can lead to tailored PLA materials with superior thermal performance for diverse applications.