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Determination of Melting Point of Succinonitrile–Pyrene System by Capillary Method (CAT#: STEM-PPA-0045-YJL)

Introduction

The vast field of materials, both natural and man-made, exhibits the intimate interdependence between society and nature. Many aspects of science and engineering are directed presently to the understanding and utility of materials with respect to performance, reliability and cost. Recent advanced technologies rely on sophisticated advanced materials. Most of these materials are mixtures of one or more phases. In a material, the presence of one or more phases causes interaction between them due to which the resulting properties are usually different from the properties of the individual phases. <br />An organic analogue of a metal–nonmetal system, namely, succinonitrile (SCN)–pyrene (PY), where SCN and PY have their heat of fusion values 3.7 and 16.6 kJ mol−1, respectively was chosen. Purity of both the components was checked by determining the melting point and comparing its value with that in the literature.




Principle

Melting point is a characteristic property of solid crystalline substance. It is the temperature at which the solid phase changes to the liquid phase. This phenomenon occurs when the substance is heated.
The melting point measurement is usually performed in thin glass capillary tubes with an internal diameter of 1 mm and a wall thickness of 0.1 – 0.2 mm. A finely-ground sample is placed in the capillary tube to a filling level of 2 – 3 mm and introduced in a heated stand (liquid bath or metal block) in close proximity to a high accuracy thermometer. The temperature in the heating stand is ramped at a user-programmable fixed rate. The melting process is visually inspected to determine the melting point of the sample.

Applications

Chemical industry; Cosmetic/pharmaceutical industry

Procedure

1. Seal capillary.
2. Fill the sample.
3. Install the instrument.
4. Determine the melting point.

Materials

• Sample Type: crystalline compounds