Effect of silica nanoparticles on tensile strength of flexible polyurethanefoam

In order to investigate the effect of silica nanoparticles (۰.۰, ۰.۲, ۰.۴, ۰.۶ and ۰.۸ w%) in flexiblepolyurethane foams, properties such as tensile strength and elongation of nanocomposite foams werestudied. Investigations showed that with increasing percentage of the silica nanoparticles (from ۰ to۰.۶ w%) leads to an increase in the rate of nucleation and, as a result, decreases the size and thicknessof the cell walls. The tensile strength of nanocomposite foams has increased from ۰.۰۷۷ to ۰.۱۴۶MPa, and the elongation percentage has decreased from ۱۱۸% to ۷۲%, and it was found that the useof ۰.۶ w% of the nano-silica is the optimal amount. Also, FT-IR analysis confirmed the polyurethanestructure of the foams by showing index peaks in ۲۲۷۲ cm-۱ (NCO), ۳۳۴۵ cm-۱ (N-H),۱۶۰۰-۱۸۰۰ cm-۱ (C=O) and ۲۸۵۰-۲۹۵۰ cm-۱ (CH).

کلیدواژه ها:

flexible ، tensile strength ، polyurethane foam ، FT-IR ، silica nanoparticles.