Abstract
Scanning tunneling microscopy images of single, double, and multistranded helical structures of bulk poly(ethylene oxide) polymers (PEO) are presented. The single-stranded helix appears to contain seven PEO monomer units with two turns per repeat unit consistent with the model proposed by Tadokoro; individual monomer units are visible. The multistranded STM images are similar to those obtained by transmission electron microscopy, but smaller in scale. A hierarchy of superhelical structures is proposed to account for the observed images
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