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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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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymers02:34

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The word polymer is derived from the Greek words “poly” which means “many” and “mer” which means “parts”. Polymers are long chains of molecules composed of repeating units of smaller molecules, known as monomers. They either occur naturally, such as DNA and proteins, or can be constructed synthetically, like plastics. They have varied structural characteristics, such as linear chains, branched chains, or complex networks, that contribute to the properties that they exhibit. Additionally,...
Polymers02:34

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Parallel plate capacitors consist of two conducting plates separated by a certain distance. However, it is mechanically difficult to hold the large plates parallel to each other without actual contact. Hence, a dielectric layer is commonly placed between the plates, which provides an easy solution for holding the plates together with a small gap and increases the capacitance of the capacitor.
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Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites
06:34

Application of a Coupling Agent to Improve the Dielectric Properties of Polymer-Based Nanocomposites

Published on: September 19, 2020

High performance polyimide with high internal free volume elements.

Yoon Jin Cho1, Ho Bum Park

  • 1WCU Department of Energy Engineering, Hanyang University, Seoul 133-791, Korea.

Macromolecular Rapid Communications
|March 26, 2011
PubMed
Summary
This summary is machine-generated.

A novel polyimide design enables fast and selective gas separation using membranes. This breakthrough in polymer science is crucial for efficient natural gas and biogas purification for clean energy.

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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes
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Layer-by-layer Synthesis and Transfer of Freestanding Conjugated Microporous Polymer Nanomembranes

Published on: December 15, 2015

Area of Science:

  • Materials Science
  • Chemical Engineering
  • Polymer Chemistry

Background:

  • Polymeric membranes are essential for gas separation applications.
  • Achieving both high permeability and selectivity in membranes remains a significant challenge.
  • Efficient purification of natural gas and biogas is critical for sustainable energy.

Purpose of the Study:

  • To report a new polyimide design for enhanced gas separation.
  • To investigate the relationship between polymer structure and mass transport properties.
  • To enable simultaneous high permeability and selectivity in polymeric membranes.

Main Methods:

  • Design of polyimides with high internal free volume elements.
  • Utilizing a three-dimensional rigid molecular structure with internal void space.
  • Characterization of polymer properties for gas molecule separation.

Main Results:

  • The designed polyimide exhibits high fractional free volume.
  • Proper cavity size facilitates separation of small gas molecules.
  • Achieved high permeability simultaneously with high selectivity.

Conclusions:

  • The novel polyimide design offers a promising solution for advanced gas separation.
  • This advancement can significantly impact natural gas and biogas purification processes.
  • The findings pave the way for more efficient clean energy resource development.