4.7 Article

Renewable phosphorous-based flame retardant for lignocellulosic fibers

期刊

INDUSTRIAL CROPS AND PRODUCTS
卷 186, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.indcrop.2022.115265

关键词

Natural fiber; Hemp fiber; Flame retardant; Phytic acid

资金

  1. Lebanese University Development and Innovation Project 2019-2021 (IGNABIOBAT)- Lebanon [EA 4370]
  2. French National Research Agency through the ARBRE Laboratory of Excellence, France [ANR-12-LABXARBRE- 01]
  3. RMN platform, Institut Jean Barriol, CRM2, Universite de Lorraine - CNRS. France
  4. CETELOR, France (Centre d'Essais TEchnique LORrain, France)

向作者/读者索取更多资源

An easy-to-use and environmentally friendly method is proposed to enhance the fire retardancy of natural fibers. The phosphorylation of hemp fibers using phytic acid and urea not only improves their non-flammability, but also affects their properties.
An easy-to-use and environmentally friendly method is proposed to increase the fire retardancy of natural fibers. Hemp fibers were phosphorylated by the grafting of phytic acid, a renewable and environmentally friendly phosphorous flame retardant and urea in aqueous solution. The fibers were characterized by X-ray fluorescence, solid state 13C and 31P NMR analysis, pyrolysis combustion flow calorimetry and tensile testing. The swelling behavior of the fibers evaluated by optical microscopy observations showed that urea promotes swelling and consequently the grafting of P and N in the fiber. It has been also shown by a bleaching step that delignification makes the cellulose slightly more accessible for grafting. Non-flammable fibers were produced with relatively low P and N contents (> 0.5 % w/w and > 0.7 % w/w respectively). However, the phosphorylation process significantly decreased cellulose crystallinity and mechanical properties of the resulting fibers. For P = 0.9 %, a 30 % decrease in the tensile strength of hemp fibers was observed. The production of phytic pyrophosphate by thermal dehydration of phytic acid has been proposed from 31P NMR results.

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