Influences of metal ions crosslinked alginate based coatings on thermal stability and fire resistance of cotton fabrics

Ying Pan; Wei Wang; Longxiang Liu; Hua Ge; Lei Song; Yuan Hu

doi:10.1016/j.carbpol.2017.04.065

Influences of metal ions crosslinked alginate based coatings on thermal stability and fire resistance of cotton fabrics

Carbohydr Polym. 2017 Aug 15:170:133-139. doi: 10.1016/j.carbpol.2017.04.065. Epub 2017 Apr 26.

Authors

Ying Pan¹, Wei Wang², Longxiang Liu¹, Hua Ge¹, Lei Song³, Yuan Hu⁴

Affiliations

¹ State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, PR China.
² State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, PR China; Suzhou Key Laboratory of Urban Public Safety, Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou, Jiangsu 215123, PR China.
³ State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, PR China. Electronic address: leisong@ustc.edu.cn.
⁴ State Key Laboratory of Fire Science, University of Science and Technology of China, Hefei, Anhui 230026, PR China; Suzhou Key Laboratory of Urban Public Safety, Suzhou Institute for Advanced Study, University of Science and Technology of China, Suzhou, Jiangsu 215123, PR China. Electronic address: yuanhu@ustc.edu.cn.

PMID: 28521978
DOI: 10.1016/j.carbpol.2017.04.065

Abstract

Bio-based and phosphorus-free coating was fabricated by layer-by-layer assembly method to obtain the flame retardant cotton fabric. For the first time, the modified cotton fabrics were prepared by utilizing positively charged polyethylenimine and negatively charged alginate together with subsequent crosslinking of barium, nickel and cobalt ions. Scanning electron microscopy and energy-dispersive X-ray demonstrated that the metal ions crosslinked coating was successfully constructed on the substrate. The thermal stability and flame retardancy were investigated by thermogravimetric analysis (TGA) and horizontal flame tests. TGA results showed that the degradation of the coated cotton fabrics were retarded at high temperature and the char residue of the cotton fabrics were improved after covered with the barium, nickel and cobalt ions crosslinked coatings. Furthermore, the fire resistance of cotton-Ba sample was enhanced significantly compared with the untreated sample, as evidenced by the obvious reduction (28%) of flame spread rate and complete char residue. Finally, the washing durability of coating on the fabric was enhanced after metal ions crosslinked with alginate based coating.

Keywords: Alginate; Coating; Cotton fabric; Layer-by-layer assembly; Metal ions.