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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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Unlike ionic or small covalent molecules, polymers do not form crystalline solids due to the diffusion limitations of their long-chain structures. However, polymers contain microscopic crystalline domains separated by amorphous domains.
Crystalline domains are the regions where polymer chains are aligned in an orderly manner and held together in proximity by intermolecular forces. For example, chains in the crystalline domains of polyethylene and nylon are bound together by van der Waals...
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Polymer Classification: Architecture01:14

Polymer Classification: Architecture

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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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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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Polymer Classification: Stereospecificity01:26

Polymer Classification: Stereospecificity

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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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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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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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Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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For any given polymer, the weight average molecular weight (Mw) is higher than, if not equal to, the number average molecular weight (Mn). The only situation in which the weight average molecular weight and the number average molecular weight are equal is when a polymer consists only of chains with equal molecular weight. However, this never happens in a synthetic polymer, since it is difficult to control the polymerization process up to a molecular level with accuracy to a hundred percent.
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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites
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Preparation of Monodomain Liquid Crystal Elastomers and Liquid Crystal Elastomer Nanocomposites

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A Highly Versatile Polymer Network Based on Liquid Crystalline Dendrimers.

Ramón Cervera-Procas1, José-Luis Serrano1, Ana Omenat1

  • 1Instituto de Nanociencia y Materiales de Aragón (INMA), CSIC-Universidad de Zaragoza, Pedro Cerbuna 12, 50009 Zaragoza, Spain.

International Journal of Molecular Sciences
|June 2, 2021
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Summary

Researchers developed a new liquid crystalline polymer network using click chemistry. This tunable material exhibits unique properties like mesomorphism and porosity, enabling solvent absorption and molecule encapsulation for diverse applications.

Keywords:
dendrimerdye encapsulationliquid crystalmechanical propertiesmicroporous structurepolymer networkresponsive materials

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Self-assembling Morphologies Obtained from Helical Polycarbodiimide Copolymers and Their Triazole Derivatives
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Area of Science:

  • Polymer Chemistry
  • Materials Science
  • Supramolecular Chemistry

Background:

  • Designing functional macromolecules with precise architectures is crucial for advanced materials.
  • Polymeric systems offer tunable properties for various applications.

Purpose of the Study:

  • To synthesize a novel liquid crystalline polymeric network.
  • To investigate the properties and potential applications of the resulting material.

Main Methods:

  • Utilized the copper(I)-catalyzed azide-alkyne cycloaddition (Huisgen 1,3-dipolar cycloaddition) for crosslinking dendrimeric entities.
  • Characterized the polymeric network's mesomorphism, viscoelastic behavior, and thermal properties.

Main Results:

  • Successfully formed an easily processable liquid crystalline polymeric network.
  • The material exhibits mesomorphism, viscoelasticity, and thermal contraction.
  • The porous microstructure allows for solvent absorption and encapsulation/release of small molecules like dyes.

Conclusions:

  • The synthesized polymeric network is highly tunable by modifying dendrimer structure.
  • This adaptable material shows promise for applications requiring controlled absorption and release functionalities.