Effects of coagulants on porous structure of membranes prepared from cellulose in NaOH/urea aqueous solution

The Effects of NaOH-Urea Aqueous Solution on the Strength and Softness Properties of Bamboo Ligno-cellulosic Fibers

“…However, when the freezing temperature was lower than -7 °C, the fiber bonding strength might be decreased by the solution. During the dissolving process of cellulose with NaOH-urea aqueous solution, the bonding strength was reduced by -C=O, -NH2, and -OH interactions, and then it would be dissolved (Zhang et al 2001;Zhou et al 2002;Mao et al 2006). Thus, the paper strength was decreased.…”

“…NaOH and urea were dissolved in deionized water at a mass ratio of 7.5:11:81.5 (NaOH: urea: H2O) as described previously (Mao et al 2006). The concentration was stabilized at room temperature for 96 h.…”

Crosslinked cellulose thin film composite nanofiltration membranes with zero salt rejection

“…Nmethylmorpholine-N-oxide, sodium hydroxide/urea and sodium hydroxide/thiourea systems are among the popular ones. These solvents have been used successfully to generate porous cellulose membranes [5,6,7,8,9,10]. Derivatization of cellulose is an alternative; cellulose is modified into a more processable polymer and is transformed back to cellulose after film deposition.…”

Membran Selulosa Kenaf Terjana Semula daripada Larutan Akues NaOH/Urea yang Digumpal Menggunakan Asid Sulfurik

“…Semasa proses pelarutan, penembusan hidrat NaOHair ke dalam struktur hablur selulosa I berlaku dan seterusnya menyebabkan selulosa terlarut dan bertukar kepada selulosa II (Zhang et al 2010). Oleh itu XRD boleh memberikan maklumat perubahan susunan kristal daripada selulosa I kepada selulosa II (Chen et al 2006 (Mao et al 2006). Walau bagaimanapun, keadaan ini boleh melemahkan kekuatan regangan pada membran.…”