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Abstract
A systematic crystallization kinetic study using thermal microscopy and differential scanning calorimetry has been carried out on two novel liquid crystalline compounds, DBA:MHB and DBA:ACP. These involve intermolecular hydrogen bonding between 4-n-decyloxybenzoic acid (DBA) and methyl 4-hydroxybenzoate (MHB); and between DBA and 2-amino-5-chloropyridine (ACP). The kinetics experiments were performed from the crystal G phase, which is a common induced kinetophase in both the compounds. Further, the proton donor and acceptor capabilities of the -COOH group of DBA towards the -OH group of MHB and -N atom of ACP were studied in the light of mesomorphism and rate of crystallization. The dimensionality in the crystal growth and the sporadic nucleation were estimated from the Avrami exponent, n. A similar type of crystallization mechanism is predicted to operate for all the crystallization temperatures. The characteristic crystallization time (t∗) at each crystallization temperature is deduced from the individual plots of log t vs. ΔH (change in enthalpy).
