Department of Chemistry and Key Laboratory of Biomedical Polymers of Ministry of Education, Wuhan University, Wuhan 430072, China.
J Mater Chem B. 2019 Jan 28;7(4):676-683. doi: 10.1039/c8tb03032d. Epub 2019 Jan 9.
A dual physical crosslinking (DPC) strategy based on the synergistic effects of electrostatic and dipole-dipole interactions was used to construct strong and tough hydrogels. The DPC hydrogels were synthesized by one-step copolymerization of acrylic acid (AAc) and acrylonitrile (AN) monomers in chitosan (Ch) solutions. The electrostatic and dipole-dipole interactions served as dynamic but highly stable associations, endowing the hydrogels with high strength, toughness and resistance to swelling. The mechanical properties of the DPC hydrogels strongly depended on the content of components. By adjusting the concentrations of Ch, AAc and AN in the prepolymerization solution, the hydrogels displayed the maximum tensile strength (0.82 MPa) and toughness (2.72 MJ m) while being subjected to a strain of more than 800%. The dual noncovalent bonding strengthening mechanism offered a universal strategy for enhancing the comprehensive mechanical properties of hydrogels. Moreover, the DPC hydrogels displayed good adhesive capability, reversible painting and moldable behavior.
采用静电和偶极-偶极相互作用协同效应的双重物理交联（DPC）策略来构建强韧水凝胶。通过在壳聚糖（Ch）溶液中单步共聚丙烯酸（AAc）和丙烯腈（AN）单体合成了 DPC 水凝胶。静电和偶极-偶极相互作用作为动态但高度稳定的结合，赋予水凝胶高强度、韧性和抗溶胀性。DPC 水凝胶的机械性能强烈依赖于成分的含量。通过调整预聚物溶液中 Ch、AAc 和 AN 的浓度，水凝胶在应变超过 800%的情况下表现出最大的拉伸强度（0.82 MPa）和韧性（2.72 MJ m）。双重非共价键增强机制为增强水凝胶的综合机械性能提供了一种通用策略。此外，DPC 水凝胶具有良好的粘附性、可逆的绘画性和可模塑性。
