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Nanosponge Tunability in Size and Crosslinking Density
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Nanoparticles can modulate network topological defects during multimodal elastomer formation.

Kishore Kumar Sriramoju1, Sangram K Rath2, Debargha Sarkar1

  • 1Department of Chemical Engineering, Indian Institute of Technology Kharagpur, West Bengal, 721302, India. hari@iitkgp.ac.in.

Physical Chemistry Chemical Physics : PCCP
|June 6, 2022
PubMed
Summary
This summary is machine-generated.

Nanoparticles regulate topological defects in polymer networks during synthesis. This research uses positron annihilation lifetime spectroscopy to study poly(dimethyl siloxane) elastomers and silicate nanoparticles.

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Area of Science:

  • Materials Science
  • Polymer Chemistry
  • Nanotechnology

Background:

  • Topological defects influence polymer network properties.
  • Controlling these defects is crucial for material performance.
  • Nanoparticles offer a potential route for defect modulation.

Purpose of the Study:

  • To investigate the effect of nanoparticles on topological defects in elastomers.
  • To quantify defect evolution during nanoparticle-infused elastomeric synthesis.
  • To understand nanoparticle-induced regulation of network structure.

Main Methods:

  • Positron annihilation lifetime spectroscopy (PALS) for free volume analysis.
  • Synthesis of poly(dimethyl siloxane) elastomers with varying nanoparticle concentrations.
  • Characterization of topological defects in unimodal, bimodal, and nanoparticle-dispersed bimodal elastomers.

Main Results:

  • Nanoparticles significantly reduce free volume hole defects between polymer chains.
  • A moderate increase in interstitial cavities near cross-links at low NP concentration, decreasing at high concentrations.
  • Minimal change in the size of remaining defects, but a qualitative reduction in collective topological defects.

Conclusions:

  • Nanoparticles effectively regulate network topological defects in elastomers.
  • The concentration of nanoparticles plays a key role in defect modulation.
  • This study provides insights into nanoparticle-assisted control of polymer network architecture.