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Hypophosphorous acid cross-linked layer-by-layer assembly of green polyelectrolytes on polyester-cotton blend fabrics
Ying Pan1, Longxiang Liu2, Xin Wang2
1State Key Laboratory of Fire Science, University of Science and Technology of China, Jinzhai Road 96, Hefei, Anhui 230026, PR China; Institute of Environmental Materials and Applications, College of Materials and Environmental Engineering, Hangzhou Dianzi University, Hangzhou, Zhejiang 310018, PR China.
Abstract:
In this work, a facile method to manufacture the layer-by-layer (LbL) assembled coating with durable flame-resistant effect on the polyester-cotton blend fabrics was reported. The LbL coating modified polyester-cotton fabric was treated with positively charged polyethyleneimine (PEI) and negatively charged oxidized sodium alginate (OSA) successively. Subsequently, the PEI/OSA coating was cross-linked by hypophosphorous acid (HA). As characterized by X-ray photoelectron spectroscopy and scanning electron microscopy, the HA cross-linked PEI/OSA coatings were successfully deposited on the surfaces of polyester and cotton fibers. Effects of the as-prepared coating on thermal stability, flame retardancy and laundering durability of the polyester-cotton blend fabrics were investigated. Thermogravimetric analysis revealed that the thermal decomposition of modified polyester-cotton fabric could be retarded obviously compared with the untreated one, as evidenced by the improvement in the 5% mass loss temperature by 30 °C. In the horizontal burning test, self-extinguishing behavior could be achieved for the polyester-cotton fabric treated with 5 bilayers coating. Moreover, the 77% and 75% reduction in the peak heat release rate and total heat release were observed for the polyester-cotton fabric treated with 10 bilayers coating. The treated fabrics still showed good flame retardant performance after 12 laundering cycles.
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