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Related Concept Videos

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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Polymer Classification: Crystallinity01:21

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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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Molecular Weight of Step-Growth Polymers01:08

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Step growth polymerization involves bi or multifunctional monomers. Bifunctional monomers react to form linear step growth polymers, whereas multifunctional monomers react to form non-linear or branched polymers.
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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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Anionic Chain-Growth Polymerization: Overview01:20

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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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Related Experiment Video

Updated: May 15, 2025

Orientational Transition in a Liquid Crystal Triggered by the Thermodynamic Growth of Interfacial Wetting Sheets
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Anisotropic Thermal Conductivity in Imine-Linked Two-Dimensional Polymer Films Produced by Interfacial

Yuxing Liang1, Kiana A Treaster2, Ayan Majumder3

  • 1Department of Mechanical Engineering, Carnegie Mellon University, 5000 Forbes Ave, Pittsburgh, Pennsylvania 15213, United States.

ACS Nano
|May 14, 2025
PubMed
Summary
This summary is machine-generated.

Anisotropic thermal transport was observed in imine-linked two-dimensional polymer (2DP) films. These materials exhibit higher in-plane thermal conductivity than cross-plane conductivity, suggesting potential for advanced thermal management applications.

Keywords:
anisotropic thermal conductivitycovalent organic frameworksfrequency domain thermoreflectancehigh-resolution calorimetersmolecular dynamics simulationstwo-dimensional polymers

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Characterization of Thermal Transport in One-dimensional Solid Materials
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Area of Science:

  • Materials Science
  • Polymer Science
  • Thermal Transport

Background:

  • Two-dimensional polymers (2DPs) are emerging materials with unique properties.
  • Understanding their thermal transport characteristics is crucial for electronic and energy applications.
  • Anisotropy in thermal conductivity can be exploited for targeted heat dissipation.

Purpose of the Study:

  • To measure and analyze the anisotropic thermal transport properties of imine-linked 2DP films.
  • To investigate the relationship between film structure and thermal conductivity.
  • To explore the potential of 2DPs for thermal management.

Main Methods:

  • Preparation of free-standing imine-linked 2DP films (Per-PDA and TAPPy-PDA) via interfacial polymerization.
  • Measurement of in-plane thermal conductivity (k∥) using a suspended calorimetric platform.
  • Measurement of cross-plane thermal conductivity (k⊥) using frequency domain thermoreflectance.

Main Results:

  • Imine-linked 2DP films exhibit higher in-plane thermal conductivity (k∥) than cross-plane thermal conductivity (k⊥).
  • Anisotropy ratios (k∥/k⊥) as high as 2.3 were observed at room temperature.
  • Thermal conductivity showed a positive correlation with temperature, attributed to phonon scattering.

Conclusions:

  • The observed anisotropy is attributed to the difference between stiff in-plane covalent bonds and flexible cross-plane interactions.
  • Molecular dynamics simulations predict significantly higher anisotropy ratios (exceeding 7) in pristine crystals.
  • Future development of higher quality 2DP films is expected to yield enhanced thermal conductivities and anisotropy.