Hypophosphorous acid cross-linked layer-by-layer assembly of green polyelectrolytes on polyester-cotton blend fabrics for durable flame-retardant treatment

Ying Pan; Longxiang Liu; Xin Wang; Lei Song; Yuan Hu

doi:10.1016/j.carbpol.2018.08.044

Hypophosphorous acid cross-linked layer-by-layer assembly of green polyelectrolytes on polyester-cotton blend fabrics for durable flame-retardant treatment

Carbohydr Polym. 2018 Dec 1:201:1-8. doi: 10.1016/j.carbpol.2018.08.044. Epub 2018 Aug 11.

Authors

Ying Pan¹, Longxiang Liu², Xin Wang³, Lei Song², Yuan Hu⁴

Affiliations

¹ State 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.
² State Key Laboratory of Fire Science, University of Science and Technology of China, Jinzhai Road 96, Hefei, Anhui 230026, PR China.
³ State Key Laboratory of Fire Science, University of Science and Technology of China, Jinzhai Road 96, Hefei, Anhui 230026, PR China. Electronic address: wxcmx@ustc.edu.cn.
⁴ State Key Laboratory of Fire Science, University of Science and Technology of China, Jinzhai Road 96, Hefei, Anhui 230026, PR China. Electronic address: yuanhu@ustc.edu.cn.

PMID: 30241800
DOI: 10.1016/j.carbpol.2018.08.044

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.

Keywords: Cross-linking; Flame retardancy; Hypophosphorous acid; Layer-by-layer assembly; Polyester-cotton blend fabrics.