Thermoresponsive Nanocellulose Hydrogels with Tunable Mechanical Properties

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• 作者：Jason R. McKee ; Sami Hietala ; Jani Seitsonen ; Janne Laine ; Eero Kontturi ; Olli Ikkala
• 刊名：ACS Macro Letters
• 出版年：2014
• 出版时间：March 18, 2014
• 年：2014
• 卷：3
• 期：3
• 页码：266-270
• 全文大小：316K
• 年卷期：v.3,no.3(March 18, 2014)
• ISSN：2161-1653

文摘

Cellulose microfibrils physically bound together by soft hemicellulose chains form the scaffolding that makes plant cell walls strong. Inspired by this architecture, we designed biomimetic thermoreversible hydrogel networks based on reinforcing cellulose nanocrystals (CNC) and thermoresponsive methylcellulose (MC). Upon dissolving MC powder in CNC aqueous dispersions, viscoelastic dispersions were formed at 20 掳C, where the storage modulus (G鈥? is tunable from 1.0 to 75 Pa upon increasing the CNC concentration from 0 to 3.5 wt % with 1.0 wt % MC. By contrast, at 60 掳C a distinct gel state is obtained with G鈥? G鈥? G鈥? 蠅⁰, with an order of magnitude larger G鈥?values from 110 to 900 Pa upon increasing the CNC concentration from 0 to 3.5 wt % with constant 1.0 wt % MC, due to the physical cross-links between MC and CNCs. Therefore, simply mixing two sustainable components leads to the first all-cellulose thermoreversible and tunable nanocellulose-based hydrogels.