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|Title:||Effect of interaction of commercial and nano size CaSO4 filler on mechanical and thermal properties of polyurethane foam|
|Abstract:||Composite foams were prepared by adding different concentration (0.5-2.5 wt%) of commercial and nano size CaSO4 filler in a single-phase polyurethane matrix. The differential Scanning Calorimeter (DSC) for composite as well as pure polyurethane was done to ascertain the degree of interaction of filler with the structure of matrix as active sites or strong interaction with the matrix. The degree of cell formation increases on increase in amount of nano filler in the composites whereas decreases in case of micron size filler in composites. The increment in specific gravity for nano size filler (0.17-0.3 g/cc) and in case of micron size filler (0.17-0.23 g/cc) makes a strong support for the increment of cell numbers. The significant enhancement (300%) in mechanical properties, compressive strength, and the optical and transmission electron micrographs (TEM) of the cell sizes also satisfies the DSC results. The decrement in amount of heat (∆H cal/g), in case of commercial size filler for curing, shows the conduction of heat is more due to formation of cells (less in numbers) that results in reduction of rate of heating. On increasing the amount of filler in composites, specific gravity increases more in case of nano size in composites rather commercial size filler. Thermal Gravimetric Analyzer (TGA) shows increment in degradation temperature in case of nano size filler. Increment of flammability for nano size filler (4.7-10.61 s/mm) and in case of commercial size filler (4.7-6.15 s/rnm), shows that the incorporation of nano particles not only improves the degradation behavior but also retards the inflammable time.|
|ISSN:||0975-1084 (Online); 0022-4456 (Print)|
|Appears in Collections:||JSIR Vol.65(07) [July 2006]|
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