Abstract
AbstractThe main‐chain thermotropic liquid‐crystalline poly(heptane‐1,7‐diyl biphenyl‐4,4′‐dicarboxylate) (P7MB) was investigated by time‐resolved small‐angle X‐ray scattering (SAXS), wide‐angle X‐ray scattering (WAXS), and differential scanning calorimerty (DSC). Nonisothermal crystallisation with different rates of cooling and heating was used. On cooling, two phase transitions are observed, isotropic melt ‐ smectic (I‐Sm) and Sm‐ three‐dimensional crystalline structure (Sm‐Cr), whereas on heating only one transition is observed, Cr‐I transition. The transition enthalpies were calculated. Temperature dependences of d‐spacings of all crystalline peaks and of the peak observed at high values of scattering vector in the SAXS region were derived. The temperature dependence of the degree of crystallinity was established, based on the integrated intensities of the crystalline peaks and amorphous halo in WAXS.
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