Janeček Emma-Rose, McKee Jason R, Tan Cindy S Y, Nykänen Antti, Kettunen Marjo, Laine Janne, Ikkala Olli, Scherman Oren A
Melville Laboratory for Polymer Synthesis, Department of Chemistry, University of Cambridge, Lensfield Road, Cambridge CB21EW (UK).
Molecular Materials, Department of Applied Physics, Aalto University (previously Helsinki University of Technology), P.O. Box 15100, FIN-00076, Espoo (Finland).
Angew Chem Weinheim Bergstr Ger. 2015 Apr 27;127(18):5473-5478. doi: 10.1002/ange.201410570. Epub 2015 Mar 13.
Hybrid nanocomposites were constructed based on colloidal nanofibrillar hydrogels with interpenetrating supramolecular hydrogels, displaying enhanced rheological yield strain and a synergistic improvement in storage modulus. The supramolecular hydrogel consists of naphthyl-functionalized hydroxyethyl cellulose and a cationic polystyrene derivative decorated with methylviologen moieties, physically cross-linked with cucurbit[8]uril macrocyclic hosts. Fast exchange kinetics within the supramolecular system are enabled by reversible cross-linking through the binding of the naphthyl and viologen guests. The colloidal hydrogel consists of nanofibrillated cellulose that combines a mechanically strong nanofiber skeleton with a lateral fibrillar diameter of a few nanometers. The two networks interact through hydroxyethyl cellulose adsorption to the nanofibrillated cellulose surfaces. This work shows methods to bridge the length scales of molecular and colloidal hybrid hydrogels, resulting in synergy between reinforcement and dynamics.
基于具有互穿超分子水凝胶的胶体纳米纤维水凝胶构建了杂化纳米复合材料，其表现出增强的流变屈服应变和储能模量的协同改善。超分子水凝胶由萘基功能化羟乙基纤维素和装饰有甲基紫精部分的阳离子聚苯乙烯衍生物组成，与葫芦[8]脲大环主体进行物理交联。通过萘基和紫精客体的结合进行可逆交联，实现了超分子体系内的快速交换动力学。胶体水凝胶由纳米纤维化纤维素组成，该纤维素结合了具有几纳米横向纤维直径的机械强度高的纳米纤维骨架。两个网络通过羟乙基纤维素吸附到纳米纤维化纤维素表面而相互作用。这项工作展示了连接分子和胶体杂化水凝胶长度尺度的方法，从而实现增强与动力学之间的协同作用。
