Abstract
Abstract Four binary polymer -solvent systems, poly(styrene)-tetrahydrofuran, poly(styrene) - p-xylene, poly(methyl methacrylate) - ethylbenzene and poly(methyl methacrylate) - tetrahydrofuran, systems have been studied. It has been observed that thicker coatings will retain a higher amount of the residual solvent as compared to thinner coatings. In the case of poly(styrene)-tetrahydrofuran coating residual solvent remaining within the coatings were 9.09% and 4.74% for the coatings of the thicknesses of 967 micron and 559 micron, respectively. Similar trends were also observed in the case of poly(methyl methacrylate)-ethylbenzene, poly(methyl methacrylate)-tetrahydrofuran, and poly(styrene)-p-xylene systems.
Highlights
Several polymer coatings such as adhesives, magnetic media, audio and video tapes are made by applying a polymer solution, made by dissolving a polymer in a solvent(s), on a moving followed by drying
The result shows that thicker coating will retain a higher amount of residual solvent compared to thinner coatings
Higher molecular weight solvents and polymers result in the higher amount of the residual solvent due to a low diffusion coefficient within the coating
Summary
Several polymer coatings such as adhesives, magnetic media, audio and video tapes are made by applying a polymer solution, made by dissolving a polymer in a solvent(s), on a moving followed by drying. Jets of hot air may be blown from the top and bottom of the coating at an optimum temperature above the boiling point of the solvent but below the boiling point of the coating to avoid defects[6] Drying conditions such as air flows, film thickness, relative humidity, temperature are responsible for final structure and properties of the coatings[7]. Price and Cairncross[9] studied the effect of operating conditions on blister formation during drying in a single-zone dryer. They defined the bubble point temperature as the temperature at which the solvent partial pressure becomes equal to the ambient pressure. This work deals with the experimental study of binary polymeric coatings using gravimetric analysis
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