Abstract
Ultra pure long chain normal alkanes (abbr.: Cn, where n is the number of carbon atoms in a chain), C80, C102, C120, C160, were synthesized by Wurtz condensation. For samples of C120 and C160, a once-folded chain crystal was formed by solution crystallization; thicknesses of the layer lamella were on an average 7.8 nm for C120, and 10.0 nm for C160, which equals to a half of the extended chain length for each molecular weight. In the DSC thermograms of the C160 crystals, an exothermic peak which indicates recrystallization to extended chain crystal following to melting of once-folded chain crystal, appeared clearly. Consequently, folding of normal alkane molecular chain was found to take place from about C120.
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Urabe, Y., Tanaka, S., Tsuru, S. et al. Synthesis of Ultra Pure Long Normal Alkanes to Hexacohectane, Their Crystallization and Thermal Behavior. Polym J 29, 534–539 (1997). https://doi.org/10.1295/polymj.29.534
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DOI: https://doi.org/10.1295/polymj.29.534