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Solvent Effects on the Ultraviolet Absorption of Polystyrene.

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Polystyrene 705 exhibits hypochromism in specific solvents, deviating from Beer's law. This behavior is linked to light scattering and solvent activity, impacting extinction coefficients.

Keywords:
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Area of Science:

  • Polymer Science
  • Spectroscopy
  • Physical Chemistry

Background:

  • NBS Standard Sample Polystyrene 705 is a widely used polymer standard.
  • Understanding its spectral properties is crucial for accurate quantitative analysis.
  • Previous studies have not fully elucidated its solution behavior in various solvents.

Purpose of the Study:

  • To investigate the UV-Vis absorption properties of Polystyrene 705.
  • To compare its spectral behavior to a model compound, ethylbenzene.
  • To understand the factors influencing Beer's law adherence and extinction coefficients.

Main Methods:

  • UV-Vis spectroscopy was employed to measure absorbance.
  • Experiments were conducted in multiple solvents, including cyclohexane and carbon tetrachloride.
  • Concentration dependence of extinction coefficients was analyzed.

Main Results:

  • Polystyrene 705 showed a significant hypochromism around 38,300 cm-1 in several solvents.
  • Beer's law was not consistently obeyed for Polystyrene 705 solutions.
  • Extinction coefficients were found to depend on concentration, light scattering, and solvent activity coefficients.

Conclusions:

  • The observed hypochromism and Beer's law deviations are attributed to intermolecular interactions and light scattering effects.
  • Specific extinction coefficients for Polystyrene 705 were determined in cyclohexane (20.89) and carbon tetrachloride (27.38).
  • These findings are important for accurate spectrophotometric measurements of polystyrene.