State Key Laboratory of Pulp and Paper Engineering, South China University of Technology, Guangzhou 510640, China.
College of Engineering, Qufu Normal University, RiZhao 276826, China.
Carbohydr Polym. 2017 Sep 1;171:77-84. doi: 10.1016/j.carbpol.2017.04.035. Epub 2017 Apr 20.
TEMPO-oxidized cellulose nanofibers/polyacrylamide/gelatin shape memory hydrogels were successfully fabricated through a facile in-situ free-radical polymerization method, and double network was formed by chemically cross-linked polyacrylamide (PAM) network and physically cross-linked gelatin network. TEMPO-oxidized cellulose nanofibers (TOCNs) were introduced to improve the mechanical properties of the hydrogel. The structure, shape memory behaviors and mechanical properties of the resulting composite gels with varied gel compositions were investigated. The results obtained from those different studies revealed that TOCNs, gelatin, and PAM could mix with each other homogeneously. Due to the thermoreversible nature of the gelatin network, the composite hydrogels exhibited attractive thermo-induced shape memory properties. In addition, good mechanical properties (strength >200kPa, strain >650%) were achieved. Such composite hydrogels with good shape memory behavior and enhanced mechanical strength would be an attractive candidate for a wide variety of applications.
通过简便的原位自由基聚合方法成功制备了 TEMPO 氧化纤维素纳米纤维/聚丙烯酰胺/明胶形状记忆水凝胶，并通过化学交联聚丙烯酰胺（PAM）网络和物理交联明胶网络形成了双重网络。TEMPO 氧化纤维素纳米纤维（TOCNs）的引入提高了水凝胶的机械性能。研究了不同凝胶组成的复合凝胶的结构、形状记忆行为和力学性能。从这些不同研究中获得的结果表明，TOCNs、明胶和 PAM 可以均匀地混合在一起。由于明胶网络的热可逆性，复合水凝胶表现出有吸引力的热诱导形状记忆性能。此外，还获得了良好的机械性能（强度>200kPa，应变>650%）。这种具有良好形状记忆性能和增强机械强度的复合水凝胶将成为各种应用的有吸引力的候选材料。
