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Related Concept Videos

Molecular Weight of Step-Growth Polymers01:08

Molecular Weight of Step-Growth Polymers

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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Rolling With Slipping

Rolling with slipping is a physical phenomenon that occurs when a rolling object experiences both rotational and linear motion but also experiences frictional forces that cause slipping. This phenomenon can occur in various situations, such as when a tire rolls on a wet road or a ball rolls on a rough surface.
An object's rolling motion is characterized by its rotation around its axis, while linear motion refers to the object's translational motion along a surface. Frictional forces can affect...
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.
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...
Polymers: Molecular Weight Distribution01:10

Polymers: Molecular Weight Distribution

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.
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.
Many natural and synthetic polymers are produced by...

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Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films
09:32

Cooling Rate Dependent Ellipsometry Measurements to Determine the Dynamics of Thin Glassy Films

Published on: January 26, 2016

Slip effects in polymer thin films.

O Bäumchen1, K Jacobs

  • 1Department of Experimental Physics, Saarland University, D-66041 Saarbrücken, Germany.

Journal of Physics. Condensed Matter : an Institute of Physics Journal
|March 10, 2011
PubMed
Summary
This summary is machine-generated.

The dewetting of polymer thin films reveals fluid dynamics at the solid-liquid interface. This process naturally drives liquid flow, enabling studies of friction and boundary conditions without external pumping.

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Area of Science:

  • Fluid dynamics
  • Polymer physics
  • Surface science

Background:

  • The solid/liquid boundary condition is crucial for understanding fluid behavior.
  • Dewetting processes in thin films offer a unique, internally driven mechanism for studying liquid flow.
  • Friction at the solid/liquid interface significantly influences flow dynamics.

Purpose of the Study:

  • To review models and experimental findings on polymer thin film dewetting.
  • To explore the role of viscous dissipation and slippage in flow dynamics.
  • To discuss molecular-scale concepts explaining interfacial slippage.

Main Methods:

  • Analysis of the temporal and spatial evolution of dewetting phenomena (e.g., hole growth, front retraction).
  • Integration of experimental results with theoretical fluid dynamics models.
  • Focus on polymers as model liquids for investigating fluid flow properties.

Main Results:

  • Dewetting provides insights into the liquid flow field and interfacial boundary conditions.
  • The balance between viscous dissipation and slippage dictates flow behavior.
  • Friction at the interface is a key factor in the observed fluid dynamics.

Conclusions:

  • Polymer thin film dewetting is a powerful tool for probing solid/liquid interfacial dynamics.
  • Understanding molecular-scale slippage is essential for a complete picture of thin film flow.
  • This approach bypasses the need for external pumping, simplifying experimental setups.