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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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Ziegler–Natta Chain-Growth Polymerization: Overview01:17

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Ziegler–Natta polymerization is another form of addition or chain‐growth polymerization used for synthesizing linear polymers over branched polymers. The catalyst used for polymerization is the Ziegler–Natta catalyst, named after Karl Ziegler and Giulio Natta, who developed it in 1953. This catalyst is an organometallic complex of titanium tetrachloride and triethyl aluminum, with the active form of the catalyst being an alkyl titanium compound. Using the Ziegler–Natta...
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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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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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Polymers: Molecular Weight Distribution01:10

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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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Updated: Nov 27, 2025

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
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Entropic Effects in Polymer Nanocomposites.

Xiaobin Dai1, Cuiling Hou1, Ziyang Xu1

  • 1State Key Laboratory of Chemical Engineering, Department of Chemical Engineering, Tsinghua University, Beijing 100084, China.

Entropy (Basel, Switzerland)
|December 3, 2020
PubMed
Summary
This summary is machine-generated.

This review explores entropic effects in polymer nanocomposites, crucial for optimizing material design. Understanding these effects helps tailor nanostructures for advanced industrial applications.

Keywords:
entropymorphologynanocompositesnanostructurethermodynamics

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Polymer nanocomposites combine polymer matrices with nanoscale fillers to enhance material properties.
  • Understanding thermodynamic interactions is key to optimizing composite design and processing.
  • Entropic effects significantly influence the morphology and phase behavior of these materials.

Purpose of the Study:

  • To review recent advancements in entropic effects within polymer nanocomposites.
  • To highlight molecular simulation methods for studying these systems.
  • To correlate characteristic parameters with entropic interactions for material tailoring.

Main Methods:

  • Review of molecular simulation techniques.
  • Analysis of experimental findings on morphologies and phase behaviors.
  • Identification of key parameters influencing entropic interactions.

Main Results:

  • Entropic effects play a critical role in determining the macroscopic properties of polymer nanocomposites.
  • Molecular simulations provide valuable insights into filler-polymer interactions and phase separation.
  • Specific parameters directly correlate with the strength and impact of entropic forces.

Conclusions:

  • Entropic effects are fundamental to understanding and controlling nanostructures in polymer composites.
  • Combining theoretical, simulation, and experimental data offers a comprehensive approach.
  • Harnessing entropic interactions enables precise tailoring of nanocomposite properties for industrial use.