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Related Concept Videos

Characteristics and Nomenclature of Copolymers01:24

Characteristics and Nomenclature of Copolymers

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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...
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Cationic Chain-Growth Polymerization: Mechanism00:57

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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: Mechanism01:04

Anionic Chain-Growth Polymerization: Mechanism

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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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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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Self-immolative Amphiphilic Diblock Copolymers with Individually Triggerable Blocks.

Xiaoli Liang1, Elizabeth R Gillies1,2,3

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|October 18, 2022
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Summary

Researchers developed novel self-immolative block copolymers with individually triggerable hydrophilic and hydrophobic blocks. These smart polymers offer enhanced control over nanoassembly disintegration upon stimuli-responsive degradation.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Self-immolative polymers degrade end-to-end upon stimuli-responsive cleavage.
  • Incorporating self-immolative polymers into block copolymers enables stimuli-triggered disintegration of nanoassemblies.
  • Diblock copolymers with two self-immolative blocks have not been previously developed.

Purpose of the Study:

  • To synthesize and characterize self-immolative block copolymers with individually triggerable hydrophilic and hydrophobic blocks.
  • To investigate the self-assembly behavior of these novel block copolymers in aqueous solution.
  • To explore the triggered depolymerization mechanisms and outcomes in response to different stimuli.

Main Methods:

  • Synthesis of neutral and cationic hydrophilic polyglyoxamides (PGAm) with acid-responsive end caps.
  • Coupling of PGAm blocks to ultraviolet (UV) light-triggerable poly(ethyl glyoxylate) (PEtG) hydrophobic blocks.
  • Characterization of self-assembly into nanoparticles and triggered depolymerization using light scattering, NMR spectroscopy, and electron microscopy.

Main Results:

  • Successfully synthesized amphiphilic self-immolative block copolymers.
  • Demonstrated self-assembly into nanoparticles in aqueous solution.
  • Achieved selective depolymerization: acid triggered PGAm block degradation leading to aggregation, while UV light triggered PEtG block degradation leading to disassembly.

Conclusions:

  • Developed a novel self-immolative block copolymer system with independently controllable degradation pathways.
  • This system offers enhanced control over the behavior and degradation of smart copolymer assemblies.
  • Provides a versatile platform for advanced materials with tunable degradation properties.