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Related Concept Videos

Polymer Classification: Crystallinity01:21

Polymer Classification: Crystallinity

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.
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Dissolution, the process by which drug particles dissolve in a solvent, is explained by the diffusion layer model, a theoretical framework that simulates the absorption of oral drugs and allows us to analyze experimental data.
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Various dissolution theories provide insight into the factors that influence the dissolution rate. Danckwerts' Model suggests that turbulence, rather than a stagnant layer, characterizes the dissolution medium at the solid-liquid interface. In this model, the agitated solvent contains macroscopic packets that move to the interface via eddy currents, facilitating the absorption and delivery of the drug to the bulk solution. The regular replenishment of solvent packets maintains the concentration...
Determination of Molar Masses of Polymers II01:27

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Cationic Chain-Growth Polymerization: Mechanism00:57

Cationic Chain-Growth Polymerization: Mechanism

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 generated carbocation,...
Step-Growth Polymerization: Overview01:03

Step-Growth Polymerization: Overview

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.
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Related Experiment Video

Updated: Jun 5, 2026

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

Slow process in confined polymer melts: layer exchange dynamics at a polymer solid interface.

L Yelash1, P Virnau, K Binder

  • 1Institute of Physics, Johannes-Gutenberg-University, 55099 Mainz, Germany.

Physical Review. E, Statistical, Nonlinear, and Soft Matter Physics
|January 15, 2011
PubMed
Summary
This summary is machine-generated.

Mass transfer between polymer layers near surfaces is slow, even in the melt state. This impacts the glass transition of confined polymers, competing with packing and rotation effects.

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Synthesis of Cyclic Polymers and Characterization of Their Diffusive Motion in the Melt State at the Single Molecule Level
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Measuring the Time-Evolution of Nanoscale Materials with Stopped-Flow and Small-Angle Neutron Scattering
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Area of Science:

  • Polymer physics
  • Materials science
  • Surface science

Background:

  • Confined polymers exhibit altered properties compared to bulk materials.
  • Understanding polymer dynamics near interfaces is crucial for material design.

Purpose of the Study:

  • Investigate mass transport dynamics in confined 1,4-polybutadiene.
  • Analyze the factors influencing the glass transition in polymers confined between graphite walls.

Main Methods:

  • Utilized Molecular Dynamics (MD) simulations.
  • Employed a chemically realistic model of 1,4-polybutadiene.
  • Simulated polymer behavior between graphite walls.

Main Results:

  • Observed slow mass exchange between polymer layers near graphite walls in the melt state.
  • Identified this slow mass transfer as a significant factor in confined polymer dynamics.
  • Demonstrated competition between mass exchange and packing/rotational effects on glass transition.

Conclusions:

  • Mass transport limitations are critical for confined polymer behavior.
  • The glass transition of confined polymers is influenced by interfacial dynamics.
  • Molecular Dynamics simulations provide insights into polymer-wall interactions.