Abstract
For the first time, an additive for conducting polymer membrane has been prepared from an Indian coal. Samla coal from Raniganj coalfield having 80% carbon on dmmf basis was first demineralised chemically and then degraded by oxidizing it with oxidizing agent followed by solubilization of oxy coal thus produced in polar organic solvent. The soluble part of the coal was dried and the solid residual part along with a neutral base material polyvinyl alcohol was used for making additive for conducting polymer membrane in the form of a coloured thin film. The quality of the film/membrane made has been extremely good and the conductance is in the range of 10-3 to 10-4 units (Scm-1). Due to non explanation of enhancement in carboxylic acid functional groups, on oxidation, from 1.2% to 18.3% by the Mazumdar's proposed model coal structure, an anomaly with respect to 9-10 position of phenanthrene is observed and reported here and a correction to this has been proposed which explains the experimental results.
Highlights
The growing importance of high performance engineering plastics, high molecular weight conducting polymers, temperature and other sensors, membranes etc, and their usage in different Industries are very well known
An attempt has been made for the first time to get an additive from coal for preparing a conducting polymer membrane in the form of a coloured thin film
It was essential every time to check that ions are not present on the surface of the oxy- coal otherwise it will affect the conductivity of the thin film or conducting polymer membrane to be prepared
Summary
The growing importance of high performance engineering plastics, high molecular weight conducting polymers, temperature and other sensors, membranes etc, and their usage in different Industries are very well known. There is an urgent need to develop processes for preparing good quality materials as mentioned above in lesser number of steps and at a cheaper cost. A numbers of model structures of coal have been put forward by different researchers working in the area of coal science. One such model structure of coal had been proposed by Mazumdar. During the course the experimental work, the results obtained is expected to be explained by this formula. If this proposed structure of coal is not able to explain the any of the results modification in the proposed coal structure is very much desired. In this paper short modification in Mazumdar’s formula has been proposed
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