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Synthesis of high-strength microcrystalline cellulose hydrogel by viscosity adjustment
Choe, Deokyeong,Kim, Young Min,Nam, Jae Eun,Nam, Keonwook,Shin, Chul Soo,Roh, Young Hoon Applied Science Publishers 2018 Carbohydrate polymers Vol.180 No.-
<P><B>Abstract</B></P> <P>Developing hydrogels with enhanced mechanical strength is desirable for bio-related applications. For such applications, cellulose is a notable biopolymer for hydrogel synthesis due to its inherent strength and stiffness. Here, we report the viscosity-adjusted synthesis of a high-strength hydrogel through the physical entanglement of microcrystalline cellulose (MCC) in a solvent mixture of tetrabutylammonium fluoride/dimethyl sulfoxide (TBAF/DMSO). MCC was strategically dissolved with TBAF in DMSO at a controlled ratio to induce the formation of a liquid crystalline phase (LCP), which was closely related to the viscosity of the cellulose solution. The highest viscosity was obtained at 2.5% MCC and 3.5% TBAF, leading to the strongest high-strength MCC hydrogel (strongest HS-MCC hydrogel). The resulting hydrogel exhibited a high compressive strength of 0.38MPa and a densely packed structure. Consequently, a positive linear correlation was determined between the viscosity of the cellulose solution and the mechanical strength of the HS-MCC hydrogel.</P> <P><B>Highlights</B></P> <P> <UL> <LI> A high-strength microcrystalline cellulose (HS-MCC) hydrogel was synthesized. </LI> <LI> The hydrogel strength was enhanced by controlling the cellulose solution viscosity. </LI> <LI> The strongest HS-MCC hydrogel exhibited densely packed structure. </LI> <LI> The HS-MCC hydrogel strength and solution viscosity were positively correlated. </LI> </UL> </P>