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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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Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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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.
Many natural and synthetic polymers are produced by...
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Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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.
As the step-growth polymerization involves step-wise condensation of monomers, the molecular weight also builds up eventually. Consequently, high molecular weight polymers are obtained at the late stages of the polymerization, where 99% of monomers have been consumed.
The extent of the...
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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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Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

3.8K
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: Sep 22, 2025

Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging
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Advanced Compositional Analysis of Nanoparticle-polymer Composites Using Direct Fluorescence Imaging

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Fast Polymer Diffusion through Nanocomposites with Anisotropic Particles.

Jihoon Choi1, Nigel Clarke2, Karen I Winey1

  • 1Department of Materials Science and Engineering, University of Pennsylvania, Philadelphia, Pennsylvania, United States.

ACS Macro Letters
|May 21, 2022
PubMed
Summary
This summary is machine-generated.

Polymer nanocomposite dynamics depend on nanoparticle size and shape. Long nanoparticles can improve polymer diffusion at higher concentrations, offering new control over material properties.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Polymer nanocomposites (PNCs) involve nanoparticles within polymer matrices.
  • Characteristic length scales of nanoparticles and polymers influence material properties.
  • Understanding polymer dynamics in PNCs is crucial for material design.

Purpose of the Study:

  • To investigate how nanoparticle (NP) size and shape affect polymer dynamics in PNCs.
  • To explore the relationship between NP geometry and polymer diffusion coefficients.
  • To identify methods for controlling polymer dynamics and viscoelasticity in PNCs.

Main Methods:

  • Studied polymer dynamics in PNCs with varying nanoparticle sizes and shapes.
  • Analyzed the influence of nanoparticle concentration on polymer diffusion.
  • Investigated the role of characteristic length scales in polymer behavior.

Main Results:

  • Polymer diffusion coefficient decreases monotonically with NP concentration for spherical and short anisotropic NPs.
  • Long anisotropic NPs cause initial polymer diffusion slowdown, followed by recovery above a critical concentration.
  • NP geometric parameters significantly impact polymer dynamics.

Conclusions:

  • Nanoparticle geometry is a key factor in determining polymer dynamics within PNCs.
  • Controlling NP shape and concentration allows for tuning polymer diffusion and viscoelasticity.
  • This research offers new pathways for designing advanced polymer nanocomposites.