Mechanically viscoelastic nanoreinforced hybrid hydrogels composed of polyacrylamide, sodium carboxymethylcellulose, graphene oxide, and cellulose nanocrystals
Mechanically viscoelastic nanoreinforced hybrid hydrogels composed of polyacrylamide, sodium carboxymethylcellulose, graphene oxide, and cellulose nanocrystals
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DOI：
10.1016/j.carbpol.2018.04.004
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发表时间：
2018-08-01
影响因子：
11.2
通讯作者：
Han, Sung Soo
中科院分区：
文献类型：
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作者：
Kumar, Anuj;Rao, Kummara Madhusudana;Han, Sung Soo
采用原位自由基聚合法制备了氧化石墨烯（GO）和/或纤维素纳米晶（CNCs）增强的聚丙烯酰胺-羧甲基纤维素钠（PMC）杂化水凝胶。本工作采用改进的Hummer法，在CNCs水悬浮液中通过酸水解新鲜合成了GO纳米片。此外，在这些四元水凝胶中研究了GO含量（1.5重量%）和CNC（从2.5重量%至10.0重量%）的影响。结果表明，GO和CNCs含量增强的杂化水凝胶具有良好的假塑性行为、自愈合能力、力学性能和形状恢复行为。PMC-GO 1.5/CNCs 10.0杂化水凝胶显示出110.5 kPa的压缩强度和887.7 N/m的刚度值（在30%应变下）。此外，GO和CNC作为水凝胶中的纳米增强物的协同效应为制备具有优异结构和机械性能的杂化水凝胶提供了新的观点。所得的杂化水凝胶具有可调的力学性能，在组织工程中具有潜在的应用前景。
Polyacrylamide-sodium carboxymethylcellulose (PMC) hybrid hydrogels reinforced with graphene oxide (GO) and/or cellulose nanocrystals (CNCs) were prepared via in situ free-radical polymerization. In this work, GO nanosheets were freshly synthesized by modified Hummer's method alongwith the aqueous suspension of CNCs by acid-hydrolysis. In addition, the effect of GO content (1.5 wt%) and CNCs (from 2.5 wt% to 10.0 wt%) was investigated in these quaternary hydrogels. The results showed good pseudo-plastic behavior, self-healing ability, mechanical performance, and shape-recovery behavior of the hybrid hydrogels reinforced with GO and CNCs content. PMC-GO1.5/CNCs10.0 hybrid hydrogel showed 110.5 kPa as compressive strength and stiffness value of 887.7 N/m (at 30% strain). Moreover, the synergistic effect of both GO and CNCs as nanoreinforcements in hydrogels provides a new point of view for the preparation of hybrid hydrogels having exceptional structural and mechanical properties. As-obtained hybrid hydrogels may have potential application in tissue engineering for tunable mechanical properties.