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Cationic surfactants as a non-covalent linker for oxidised cellulose nanofibrils and starch-based hydrogels
Carbohydrate Polymers ( IF 6.044 ) Pub Date : 2019-12-31 , DOI: 10.1016/j.carbpol.2019.115816
Kazi M. Zakir Hossain; Vincenzo Calabrese; Marcelo A. da Silva; Saffron J. Bryant; Julien Schmitt; Janet L. Scott; Karen J. Edler

Rheological properties of hydrogels composed of TEMPO-oxidised cellulose nanofibrils (OCNF)-starch in the presence of cationic surfactants were investigated. The cationic surfactants dodecyltrimethylammonium bromide (DTAB) and cetyltrimethylammonium bromide (CTAB) were used to trigger gelation of OCNF at around 5 mM surfactant. As OCNF and DTAB/CTAB are oppositely charged, an electrostatic attraction is suggested to explain the gelation mechanism. OCNF (1 wt%) and soluble starch (0.5 and 1 wt%) were blended to prepare hydrogels, where the addition of starch to the OCNF resulted in a higher storage modulus. Starch polymers were suggested to form networks with cellulose nanofibrils. The stiffness and viscosity of OCNF-Starch hydrogels were enhanced further by the addition of cationic surfactants (5 mM of DTAB/CTAB). ζ -potential and amylose-iodine complex analyses were also conducted to confirm surface charge and interaction of OCNF-starch-surfactant in order to provide an in-depth understanding of the surfactant-induced gel networks.
更新日期:2019-12-31

 

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