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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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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.
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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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Polymer Classification: Stereospecificity01:26

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Polymerization generates chiral centers along the entire backbone of a polymer chain. Accordingly, the stereochemistry of the substituent group has a significant effect on polymer properties. Polymers formed from monosubstituted alkene monomers feature chiral carbons at every alternate position in the polymer backbone. Relative to the predominant orientation of substituents at the adjacent chiral carbons, the polymer can exist in three different configurations: isotactic, syndiotactic, and...
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Anionic Chain-Growth Polymerization: Mechanism01:04

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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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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.
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Acid-Responsive Poly(glyoxylate) Self-Immolative Star Polymers.

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New star-shaped self-immolative polymers (poly(ethyl glyoxylate)s) were designed to create pH-responsive nanoparticles for drug delivery. These nanoparticles demonstrate controlled disruption in response to pH changes.

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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Self-immolative polymers offer potential for controlled release applications like drug and gene delivery.
  • Tailoring polymer responsiveness to specific biological conditions is crucial for their practical use.
  • Stimulus-responsive polymers can be designed to degrade or change properties in response to environmental cues.

Purpose of the Study:

  • To design and synthesize novel star-shaped self-immolative poly(ethyl glyoxylate)s (PEtGs).
  • To incorporate these PEtGs into pH-responsive nanoparticles.
  • To investigate the pH-dependent behavior and disruption of these nanoparticles.

Main Methods:

  • Synthesis of star-shaped PEtGs using tetrathiol initiators and pH-responsive end-caps.
  • Modification of PEtGs with amine groups to introduce charge-shifting properties.
  • Preparation and characterization of pH-responsive nanoparticles using dynamic light scattering and 1H NMR spectroscopy.

Main Results:

  • A library of star PEtG polymers responsive to pH was successfully synthesized.
  • Depolymerization rate was found to be controlled by end-cap chemistry, not polymer architecture.
  • Modified polymers formed pH-responsive nanoparticles that exhibited pH-dependent disruption.

Conclusions:

  • Star-shaped self-immolative PEtGs can be designed for pH responsiveness.
  • The end-cap chemistry is a key factor in controlling polymer depolymerization.
  • These novel polymers can form functional nanoparticles for potential use in targeted drug delivery systems.