Conformational Characterization of the Single Crystal Surface

  • Y. A. Chang
  • A. Hiltner
Part of the Polymer Science and Technology book series


The surfaces of polyethylene single crystals have been selectively brominated, and the conformational sensitivity of the C-Br infrared stretching modes has been utilized to characterize the fold structure. From the analysis of low molecular weight compounds, band assignments have been made for each of the six possible conformations of the two C-C bonds adjacent to the C-Br bond. The gauche conformations predominate in the spectra of single crystals. The calculated conformational populations were observed to change with temperature particularly in the region of the dynamic mechanical a relaxation. As a result of similarities observed in the infrared spectra of brominated crystals and one of the model compounds, bromocyclooctane, models for the chain fold have been proposed. These consist of nine carbon atoms arranged in the crown or twisted-crown structures. Both models conform well to the lattice constraints of the {110} fold.


Single Crystal Surface Trans Conformation Gauche Conformation Meso Form Chain Fold 
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Copyright information

© Plenum Press, New York 1983

Authors and Affiliations

  • Y. A. Chang
    • 1
  • A. Hiltner
    • 1
  1. 1.Department of Macromolecular Science, Case Institute of TechnologyCase Western Reserve UniversityClevelandUSA

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