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Related Concept Videos

Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

2.7K
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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Anionic Chain-Growth Polymerization: Overview01:20

Anionic Chain-Growth Polymerization: Overview

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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,...
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Anionic Chain-Growth Polymerization: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

2.3K
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...
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Related Experiment Video

Updated: Dec 6, 2025

Evaluation of Polymeric Gene Delivery Nanoparticles by Nanoparticle Tracking Analysis and High-throughput Flow Cytometry
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Evaluation of Polymeric Gene Delivery Nanoparticles by Nanoparticle Tracking Analysis and High-throughput Flow Cytometry

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Multicomponent Polymerization toward Cationic Polymers for Efficient Gene Delivery.

Nan Zheng1, Daniel Kwesi Cudjoe1, Wangze Song1

  • 1State Key Laboratory of Fine Chemicals, School of Chemical Engineering, Dalian University of Technology, Dalian, 116024, P. R. China.

Macromolecular Rapid Communications
|October 14, 2020
PubMed
Summary

New cationic polymers with tertiary amine, thioether, and hydroxyl groups show promise for nonviral gene delivery. These polycations offer high transfection efficiency and low toxicity, making them potential candidates for clinical applications.

Keywords:
amine and thioether based polymerscationic polymersgene transfectionhydroxyl groupsmulticomponent polymerization

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Area of Science:

  • Polymer Chemistry
  • Biomaterials Science
  • Gene Therapy

Background:

  • Nonviral gene delivery vectors are crucial for therapeutic applications.
  • Developing efficient and safe gene delivery systems remains a significant challenge.
  • Existing vectors often face limitations in transfection efficiency and toxicity.

Purpose of the Study:

  • To synthesize a novel class of cationic polymers.
  • To evaluate their potential as nonviral gene delivery vectors.
  • To investigate the structure-property relationships influencing gene delivery performance.

Main Methods:

  • A catalyst-free, multicomponent polymerization method was employed.
  • Dithiol, formaldehyde, and di-sec-amine were used in a 1:2:1 ratio.
  • Characterization included molecular weight determination and functional group analysis.

Main Results:

  • Water-soluble polycations with molecular weights of 5000–8000 Da were synthesized in high yields (up to 90%).
  • The polymers exhibited efficient gene condensation, reactive oxygen species scavenging, and charge shielding.
  • Transfection efficiency was up to 3.5-fold higher than PEI25k with reduced cytotoxicity.

Conclusions:

  • The novel cationic polymers demonstrate significant potential as nonviral gene delivery vectors.
  • Thioether and hydroxyl groups contribute to reduced cytotoxicity and enhanced performance under serum conditions.
  • These polycations show promise for clinical gene therapy applications.