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Related Concept Videos

Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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

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 acceptor.

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Towards chiral microporous soluble polymers--binaphthalene-based polyimides.

Nicola Ritter1, Irena Senkovska, Stefan Kaskel

  • 1Max Planck Institute of Colloids and Interfaces, Department of Colloid Chemistry, Research Campus Golm, D-14424 Potsdam, Germany.

Macromolecular Rapid Communications
|March 25, 2011
PubMed
Summary

Researchers developed a novel chiral polyimide, a soluble and intrinsically microporous polymer. This material offers unique processing advantages over traditional microporous substances, enabling advanced applications.

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
06:55

Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level

Published on: September 26, 2016

Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Nanotechnology

Background:

  • Intrinsically microporous polymers are gaining research interest due to their processability and functionalization capabilities, unlike traditional microporous materials.
  • Microporous polyimides are particularly attractive due to their high chemical and thermal stability.
  • Current research focuses on developing advanced polymers with tailored pore structures and properties.

Purpose of the Study:

  • To report the first synthesis of a chiral, intrinsically microporous, and soluble polyimide.
  • To characterize the pore system of the novel polyimide using gas adsorption techniques.
  • To compare the properties of the chiral polyimide with its racemic form to understand the impact of superstructure.

Main Methods:

  • Synthesis of a novel chiral polyimide.
  • Solubility testing in common organic solvents.
  • Structural analysis of the synthesized polymer.
  • Gas adsorption analysis (N2, Ar, H2, CO2) to characterize the pore system.
  • Comparison with a racemic counterpart.

Main Results:

  • Successful synthesis of a chiral polyimide that is intrinsically microporous and soluble.
  • Characterization of the polymer's pore structure through gas adsorption isotherms.
  • Demonstration of unique properties arising from the chiral superstructure compared to the racemic form.
  • High chemical and thermal stability inherent to polyimides.

Conclusions:

  • The development of this chiral, soluble, and intrinsically microporous polyimide represents a significant advancement in polymer materials.
  • The material's processability opens new avenues for applications requiring tailored porous structures.
  • The study highlights the importance of ordered superstructures in dictating the properties of microporous polymers.