Small-Angle X-Ray Scattering from Bulk Block Polymers in Disordered State. Estimation of χ-Values from Accidental Thermal Fluctuations

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Abstract

Small-angle X-ray scattering (SAXS) from accidental thermal concentration fluctuations of block polymers in bulk and in the disordered state was studied for a polystyrene–polyisoprene diblock polymer as a function of temperature. It was shown that the experimental SAXS profiles are predictable by Leibler’s theory based on the random phase approximation. Temperature dependence of χ-parameter between polystyrene and polyisoprene was estimated by fitting the experimental and theoretical SAXS profiles. An effect of glass transition on the thermal concentration fluctuations was also predicted.

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Keywords

  • SAXS
  • Block Polymers
  • Disordered State
  • Order-Disorder Transition
  • Random Phase Approximation
  • χ-Parameter
  • Microphase Separation
  • Glass Transition Temperature
  • Accidental Thermal Fluctuations

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