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Disorder by random crosslinking in smectic elastomers.

Denitza M Lambreva1, Boris I Ostrovskii, Heino Finkelmann

  • 1FOM-Institute AMOLF, Kruislaan 407, 1098 SJ Amsterdam, The Netherlands.

Physical Review Letters
|November 5, 2004
PubMed
Summary
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We studied how random crosslinking affects order in smectic elastomers using X-rays. Low crosslinking stabilizes smectic structures, but higher concentrations lead to disorder and short-range correlations.

Area of Science:

  • Materials Science
  • Polymer Physics
  • Condensed Matter Physics

Background:

  • Smectic elastomers exhibit unique properties due to the interplay between polymer networks and liquid crystal phases.
  • Understanding the impact of structural disorder on their ordering is crucial for material design.

Purpose of the Study:

  • To investigate the influence of random crosslinking density on the one-dimensional translational ordering in smectic elastomers.
  • To analyze the transition from long-range order to disorder as crosslinking increases.

Main Methods:

  • High-resolution X-ray scattering experiments were performed on smectic elastomers with varying crosslink densities.
  • Analysis of the structure factor to quantify translational ordering and correlation lengths.

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Main Results:

  • A low crosslink density (approx. 5%) stabilizes smectic structures, extending order to micrometers.
  • Increased crosslinking reduces domain size, indicating a transition towards disorder.
  • At 20% crosslinking, the structure factor follows a Lorentzian, signifying extended short-range correlations.

Conclusions:

  • Random crosslinking significantly impacts the translational ordering in smectic elastomers.
  • The study provides experimental evidence supporting theories of quenched disorder in soft materials.
  • Findings offer insights into controlling order-disorder transitions in polymer-based liquid crystals.