TEMPO-Oxidized Nanocellulose Participating as Crosslinking Aid for Alginate-Based Sponges

Abstract

Crosslinked polysaccharide sponges have been prepared by freeze-drying of amorphous alginate-oxidized nanocellulose in the presence of a Ca(2+) ionic crosslinking agent. The new carboxyl groups on the surface of nanocellulose induced by the chemical oxidization provided the possibility of participating in the construction of an alginate-based sponge's structure and played a fundamental role in the structural and mechanical stability of ensuing sponges. Furthermore, enhanced mechanical strength induced by oxidized cellulose nanocrystals and the formation of a semi-interpenetrating polymer network from oxidized microfibrillated cellulose were reported. Together with the facile and ionic crosslinking process, the ultrahigh porosity, promising water absorption and retention, as well as the improved compression strength of the crosslinked sponges should significantly extend the use of this soft material in diverse practical applications.

Use of surfactants in cellulose nanowhisker/epoxy nanocomposites: effect on filler dispersion and system properties

“…To reach high mechanical properties, it is important to extract the crystalline parts from the cellulose sources by different methods such as mechanical treatment (Alemdar and Sain 2008), acid hydrolysis (Sadeghifar et al 2011) and TEMPO-mediated oxidation (Saito and Isogai 2008;Lin et al 2012). Moreover, the aspect ratio of cellulose nanowhiskers is dependent on their sources and preparation method, which lead to different mechanical properties (Eichhorn et al 2010).…”

Nanocellulose-alginate hydrogel for cell encapsulation

“…As shown in Fig. 1C, TOBC still distinctly presented the diffraction peaks of BC at 2theta angles near 14, 16, and 22 (Lin et al, 2012;Zhang et al, 2010). Fig.…”

“…The asymmetric stretching band at 1602 cm −1 of the FTIR spectra indicated chains modified by carboxyl groups. Moreover, the stretching vibration band of the C H at 2896-2990 cm −1 and stretching vibration band of the OH groups near 3345-3539 cm −1 were considerably reduced after the modification in TOBC (Dong, Snyder, Williams, & Andzelm, 2013;Fujisawa, Okita, Fukuzumi, Saito, & Isogai, 2011;Lin, Bruzzese, & Dufresne, 2012).…”

Nanocellulose

“…Nanocomposites containing nanocellulose combined with other natural matrices known for their benefi cial effect for skin tissue repair (collagen [ 23 ], polyethylene glycol [ 24 ], polyvinyl alcohol [ 25 ], chitosan [ 26 ], gelatin [ 27 ], alginate [ 28 ]) were reported as well. They showed enhancement of the healing process and promise for applications in skin regeneration.…”