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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: Molecular Weight Distribution01:10

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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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Solution Blow Spinning of Polymeric Nano-Composite Fibers for Personal Protective Equipment
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Thermal evolution of a polymer-nanoparticle binary mixture.

Sanjay Kumar1,2, Sangram K Rath3, Ashwani Kushwaha4

  • 1Department of Chemical Engineering, B.M.S. College of Engineering, Bengaluru 560 019, India.

Physical Chemistry Chemical Physics : PCCP
|January 5, 2024
PubMed
Summary
This summary is machine-generated.

Thermal evolution in polymer-nanoparticle mixtures alters nanoparticle crystallinity and polymer-nanoparticle interactions. This process creates a diffuse interface, impacting material properties.

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Area of Science:

  • Materials Science
  • Polymer Science
  • Nanotechnology

Background:

  • Polymer-nanoparticle (NP) mixtures exhibit unique properties influenced by thermal history.
  • Understanding microscopic variations during thermal evolution is crucial for tailoring material performance.

Purpose of the Study:

  • To experimentally investigate the effects of thermal evolution on NP dispersion, crystallinity, polymer-NP interface, and interactions.
  • To map these changes across various temperatures and NP concentrations.

Main Methods:

  • Experimental probing of a model polybutadiene and clay nanoplatelet mixture.
  • Analysis across a spectrum of temperatures (T > Tg) and NP concentrations.

Main Results:

  • NP dispersion remains unaffected by thermal evolution and NP concentration.
  • NP crystalline order significantly decreases with thermal evolution.
  • A sharp polymer-NP interface transitions to a diffuse layer, while already diffuse interfaces remain unchanged.
  • Dominant interactions shift from polymer-polymer to polymer-NP.

Conclusions:

  • Thermal evolution significantly impacts NP crystallinity and polymer-NP interfacial characteristics.
  • The study explains the molecular basis for anomalous behaviors in polymer-nanoparticle mixtures.
  • Findings provide insights for designing advanced nanocomposite materials.