Light Scattering by Polymer Networks

  • W. Prins

Summary

Non-crystalline polymer networks, whether swollen or not, may exhibit interchain structuring effects due to incompatibility of various parts of the chains (e.g., backbone-side chain or blocks along a copolymer chain). Also, the network-formation process may lead to inhomogeneously crosslinked networks, possibly resulting in micro-phase separation. The complete polarized light scattering envelope provides structural information on the basis of the Rayleigh-Debye approximation in terms of either correlation functions or specific models for the structure. Small angle data can be utilized in conjunction with Gaussian correlation functions to obtain the scattered intensity at zero angle. This quantity yields the extent of polarizability fluctuations — sometimes relatable to fluctuations in crosslink density — as well as the mean anisotropy per volume element — sometimes relatable to regions of mesomorphic order. Wide angle data may reveal the existence of a more specific structure than that implied by Gaussian correlation functions. A comparison of the experimental data with calculated scattering patterns for specific models of the structure then becomes useful. Recent studies on various networks (poly saccharides, gelatin, poly vinylalcohol, hydrophilic poly methacrylates and poly urethanes) will be used to illustrate the above concepts.

Keywords

Light Scattering Polymer Network Crosslinking Density Urethane Link Rayleigh Ratio 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.

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Copyright information

© Springer Science+Business Media New York 1971

Authors and Affiliations

  • W. Prins
    • 1
  1. 1.Department of ChemistrySyracuse UniversitySyracuseUSA

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