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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

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...
Anionic Chain-Growth Polymerization: Overview01:20

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,...
Electrophilic Aromatic Substitution: Nitration of Benzene01:20

Electrophilic Aromatic Substitution: Nitration of Benzene

The nitration of benzene is an example of an electrophilic aromatic substitution reaction. It involves the formation of a very powerful electrophile, the nitronium ion, which is linear in shape. The reaction occurs through the interaction of two strong acids, sulfuric and nitric acid.
Free-Radical Chain Reaction and Polymerization of Alkenes02:35

Free-Radical Chain Reaction and Polymerization of Alkenes

The conversion of alkenes to macromolecules called polymers is a reaction of high commercial importance. The structure of the polymer is defined by a repeating unit, while the terminal groups are considered insignificant. The average degree of polymerization represents the number of repeating units in the polymer molecule and is denoted by the subscript n.
Step-Growth Polymerization: Overview01:03

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...
Olefin Metathesis Polymerization: Acyclic Diene Metathesis (ADMET)00:53

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...

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Related Experiment Video

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Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
07:39

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst

Published on: June 8, 2016

Multi-responsive nitrobenzene-based amphiphilic random copolymer assemblies.

Hao Wu1, Jie Dong, Cancan Li

  • 1School of Materials Science and Engineering, University of Science and Technology Beijing, Beijing 100083, China.

Chemical Communications (Cambridge, England)
|February 12, 2013
PubMed
Summary
This summary is machine-generated.

Researchers developed a novel nitrobenzene-based copolymer that responds to light, acid, and heat. This multi-responsive material enables controlled release of encapsulated molecules through morphological changes in its assemblies.

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Last Updated: May 14, 2026

Facile Synthesis of Worm-like Micelles by Visible Light Mediated Dispersion Polymerization Using Photoredox Catalyst
07:39

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Published on: June 8, 2016

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
09:22

Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives

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Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability
09:09

Synthesis of Poly(N-isopropylacrylamide) Janus Microhydrogels for Anisotropic Thermo-responsiveness and Organophilic/Hydrophilic Loading Capability

Published on: February 27, 2016

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Amphiphilic copolymers self-assemble into various nanostructures.
  • Stimuli-responsive materials offer tunable properties for advanced applications.
  • Nitrobenzene derivatives are known for their responsiveness to external stimuli.

Purpose of the Study:

  • To synthesize a novel nitrobenzene-based amphiphilic copolymer.
  • To investigate the multi-responsive behavior of the copolymer assemblies.
  • To explore the potential for controlled release applications.

Main Methods:

  • Synthesis of a photo-, acid-, and thermo-responsive nitrobenzene-based amphiphilic copolymer.
  • Characterization of copolymer assemblies using Transmission Electron Microscopy (TEM), Dynamic Light Scattering (DLS), and Atomic Force Microscopy (AFM).
  • Evaluation of morphological changes in response to multiple stimuli.

Main Results:

  • Successful synthesis of the target copolymer.
  • Demonstration of multi-responsive self-assembly behavior.
  • Correlation between morphological changes and stimuli (photo, acid, thermal).
  • Evidence of controlled release of encapsulated molecules facilitated by stimulus-induced structural transitions.

Conclusions:

  • The synthesized nitrobenzene-based copolymer exhibits significant multi-responsive characteristics.
  • Stimuli-responsive morphological changes are key to controlling molecular release.
  • This material holds promise for applications in drug delivery and smart materials.