State Key Laboratory of Pulp and Paper Engineering, School of Light Industry and Engineering, South China University of Technology, Guangzhou 510640, China.
School of Medicine, South China University of Technology, Guangzhou 510006, China.
Carbohydr Polym. 2020 May 15;236:116061. doi: 10.1016/j.carbpol.2020.116061. Epub 2020 Feb 21.
Nanocomposite hydrogels consisting of a synthetic matrix reinforced by nanosized crystalline polysaccharides offer significant potential in various fields. Different from nanocellulose, the combination of nanochitin with synthetic polymers to obtain nanocomposite hydrogels has not been extensively and systematically studied. Herein, a physically and chemically dual crosslinked nanocomposite hydrogel was successfully synthesized, where chitin nanowhiskers (ChNWs) and Zn were incorporated within polyacrylamide (PAAm) matrix. Nanochitin/metal ion dual reinforcement imparts increased elasticity, enhanced mechanical properties, and improved recovery performance to PAAm network. The PAAm/ChNWs/Zn hydrogel could be stretched to over 13 times its original length with tensile strength of 321.9 ± 8.2 kPa, and restore its original shape rapidly even when compressed at a strain of 95% with a corresponding compressive strength of 6.95 ± 0.20 MPa. The multiple crosslinks and interactions among ChNWs, Zn and synthetic polymeric network were investigated. Moreover, the hydrogel was applied in drug release and soft bioelectronics.
由纳米尺寸的结晶多糖增强的合成基质组成的纳米复合水凝胶在各个领域具有重要的应用潜力。与纳米纤维素不同，纳米壳聚糖与合成聚合物的结合以获得纳米复合水凝胶尚未得到广泛和系统的研究。本文成功合成了一种物理和化学双重交联的纳米复合水凝胶，其中壳聚糖纳米纤维（ChNWs）和 Zn 被掺入聚丙烯酰胺（PAAm）基质中。纳米壳聚糖/金属离子双重增强赋予 PAAm 网络更高的弹性、增强的机械性能和更好的恢复性能。PAAm/ChNWs/Zn 水凝胶可以拉伸至超过原始长度的 13 倍，拉伸强度为 321.9 ± 8.2 kPa，即使在应变 95%时压缩，也能迅速恢复原状，相应的压缩强度为 6.95 ± 0.20 MPa。研究了 ChNWs、Zn 和合成聚合物网络之间的多重交联和相互作用。此外，该水凝胶还应用于药物释放和软生物电子学。
