Cotton fabrics modified with Si@ hyperbranched poly(amidoamine): their salt-free dyeing properties and thermal behaviors

Cotton fabrics are usually modified with hyperbranched polymers or silica sol solely. The finishing agents that possess the property of hyperbranched polymers and silica sol at same time and in same substance are seldom. In this paper, organosilicon loaded hyperbranched poly(amidoamine) (Si@ PAMAM) was synthesized and its structure was confirmed by ¹H NMR and FT IR, the cotton fabrics were modified with Si@ PAMAM by sol–gel process. The modification effects were tested by FT IR and SEM, the salt-free dyeing properties and thermal behaviors were investigated as well. The results indicated that Si@ PAMAM graft could impart cotton fabrics salt free dyeing property. After dyed with salt free dyeing process, the color fastness, levelling property and washing endurance of grafted cotton fabrics were good. The TGA analysis showed the temperature interval of the maximum mass loss rate of modified cotton was 33 °C higher than that of blank cotton, this means the Si@ PAMAM modification can improve the heat stability of cotton fabric. The SEM demonstrated that Si@ PAMAM gel deposited on the surface of fibers well.