Solid binary mixtures of neopentanol with tert-Butyl chloride and carbon tetrachloride studied by thermal, X-ray and dielectric techniques

• DSC, dielectric and X-ray measurements have been done on TBC-NPOH and CTC-NPOH.
• The results show the formation of solid solution for concentrations 0.7 ≤ xm ≤ 0.9.
• A primary α-process and two sub-Tg processes are found for TBC-NPOH.
• For CTC-NPOH only one sub-Tg process is found.
• All the three sub-Tg processes are Johari–Goldstein type.

The binary mixtures of Neopentanol (NPOH) with tert-Butyl chloride (TBC) and Carbon tetrachloride (CTC), have been studied using Differential Scanning Calorimetry, Dielectric spectroscopy and X-ray diffraction techniques. The results indicate the formation of the solid solutions. The crystalline solid thus formed is found to be orientationally disordered and supercools easily to form glassy crystal for mole fraction of NPOH in the range of 0.7–0.9. The Tg values are in the range of 140–147 K. In the dielectric study, a primary α-process and two sub-Tg processes are found for TBC-NPOH, whereas for CTC-NPOH only one sub-Tg process is found. The dielectric spectra of α- process follows the Havriliak–Negami equation. The sub-Tg processes follow the Cole–Cole equation, and are found to be of Johari–Goldstein type, indicating intermolecular nature.