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Related Concept Videos

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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Polymers are classified as linear or branched on the basis of their chain architecture. The polymer chains in linear polymers have a long chain-like structure with minimal to no branching at all. Even if a polymer features large substituent groups on the monomer, which appear as branches to the skeleton, it is not considered a branched polymer. A branched polymer contains secondary polymer chains that arise from the main polymer chain. The branching occurs when the polymer growth shifts from...
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Updated: Sep 30, 2025

A Rapid Synthesis Method for Au, Pd, and Pt Aerogels Via Direct Solution-Based Reduction
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Polyurea Aerogels: Synthesis, Material Properties, and Applications.

Nicholas Leventis1

  • 1Aspen Aerogels, Inc. 30 Forbes Road, Bldg B, Northborough, MA 01532, USA.

Polymers
|March 10, 2022
PubMed
Summary
This summary is machine-generated.

Polyurea aerogels, synthesized from isocyanates, offer tunable nanostructures and properties. Their low cost and versatility make them promising for insulation, adsorption, and as carbon aerogel precursors.

Keywords:
K-indexaerogelamineisocyanatemineral acidnanomorphologypolyureastructure–property relationshipswater

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Area of Science:

  • Materials Science
  • Polymer Chemistry

Background:

  • Polyurea aerogels are a class of polymeric aerogels derived from isocyanate chemistry.
  • They are synthesized through various reactions, including isocyanates with amines, water, or mineral acids.

Purpose of the Study:

  • To provide a comprehensive review of polyurea-based aerogels.
  • To explore their synthesis, nanostructural properties, and diverse applications.

Main Methods:

  • Review of established and novel synthetic routes for polyurea aerogels.
  • Analysis of structure-property relationships based on varying synthetic conditions.
  • Examination of polyurea aerogels as precursors for carbon aerogels.

Main Results:

  • The reaction of isocyanates with water is a popular and cost-effective method for polyurea aerogel synthesis.
  • Polyurea aerogels exhibit a wide range of nanostructures and functional properties.
  • Aromatic isocyanate-based polyurea aerogels are viable precursors for carbon aerogels.

Conclusions:

  • Polyurea aerogels present a versatile platform with tunable properties due to controllable nanostructures.
  • Their low cost and potential applications in thermal/acoustic insulation, oil adsorption, and environmental cleanup highlight their significance.
  • Commercialization of several polyurea aerogel types is underway.