title: Synthesis and urea sustained-release behavior of an eco-friendly superabsorbent based on flax yarn wastes.
abstract: In order to develop an eco-friendly superabsorbent composite, flax yarn waste (FYW) was used as raw material to synthesize a novel flax yarn waste-g-poly(acrylic acid-co-acrylamide) (FYW/PAA) superabsorbent composite. Acrylic acid (AA) and acrylamide (AM) were grafted onto the pretreated flax yarn waste (PFYW) by free-radical graft copolymerization in homogeneous aqueous solution. The properties and synthesis conditions of the FYW/PAA superabsorbent composite were investigated. As a result, the prepared FYW/PAA attained the best water absorbency of 875 g/g in distilled water, 490 g/g in rainwater and 90 g/g in 0.9 wt% NaCl solution. The urea loading percentage of FYW/PAA could be modulated by the concentration of urea. The release of urea from FYW/PAA in water showed a typical three-stages sustained release behavior. Meanwhile, a weight residue of 53.6 wt% was attained after being buried in soil for 90 d.
authors.affiliation: The Key Laboratory of Advanced Textile Materials and Manufacturing Technology of the Ministry of Education, College of Materials and Textiles, Zhejiang Sci-Tech University, Hangzhou 310018, China.
authors.forename: Yong
authors.initials: Y
authors.lastname: Zhang
authors.forename: Fang
authors.initials: F
authors.lastname: Wu
authors.forename: Lin
authors.initials: L
authors.lastname: Liu
authors.forename: Juming
authors.initials: J
authors.lastname: Yao
mesh_terms: D000042:Absorption; D000178:Acrylamides / Q000138:chemical synthesis* / Q000737:chemistry*; D060326:Chemistry Techniques, Synthetic; D019597:Flax / Q000737:chemistry*; D055772:Green Chemistry Technology; D007220:Industrial Waste; D012987:Soil / Q000737:chemistry; D013783:Textile Industry; D014508:Urea / Q000737:chemistry*
chemical_list: D000178:Acrylamides; D007220:Industrial Waste; D012987:Soil; C431184:poly(acrylamide-co-acrylic acid); D014508:Urea