Polymorphism, crystal–crystal and liquid crystalline thermotropic phase transition behaviour of even chain length zinc(II) n-alkanoates

作者: Richard A. Taylor , Henry A. Ellis

DOI: 10.1080/02678290902842594

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摘要: The thermotropic phase behaviour of a homologous series even chain length polymeric zinc(II) n-alkanoates, Zn(CnH2n-1O2)2 (ZnC4–20) has been studied by means differential scanning calorimetry (DSC) and temperature variation polarising light microscopy. compounds exhibit both enantiotropic monotropic on heating to the isotropic liquid cooling back room solid, as seen from following sequences: ZnC4–12, Lamellar Crystal ↔ I II Isotropic Melt; ZnC14–16, Liquid; ZnC18–20, → Liquid, ← Smectic C Liquid. total enthalpy entropy change for melting increase linearly with are higher than expected complete fusion alkyl chains suggesting that step-wise process involves changes in electrostatic interactions polar region molecule. diagrams show tha...

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