Wang Xiangong, Zhao Fang, Pang Bo, Qin Xuping, Feng Shengyu
Key Laboratory of Special Functional Aggregated Materials, Key Laboratory of Colloid and Interface Chemistry, Ministry of Education, School of Chemistry and Chemical Engineering, Shandong University Jinan 250100 P. R. China
RSC Adv. 2018 Feb 12;8(13):6789-6797. doi: 10.1039/c7ra13360j. eCollection 2018 Feb 9.
In this work, poly(vinyl alcohol) (PVA) was incorporated into the networks of polyacrylamide/polyacrylic acid (PAM/PAA) to prepare novel PAM/PAA/PVA Triple-network (TN) hydrogels by an polymerization and repeated freezing-thawing (F-T) process. The TN hydrogels have not only high mechanical strength, but also a moderate swelling ability by varying the weight ratio of calcium chloride (CaCl) and PVA and free shaping. The compressive stress of the as-prepared hydrogels could reach 11 MPa, and the highest stretching stress could reach 0.8 MPa. Upon mechanical loading, the coordination network between PAA and CaCl served as sacrificial bonds to efficiently dissipate energy. However, they can reform when the mechanical load is released, resulting from the fast coordination between PAA and Ca. Therefore, TN hydrogels have potential application in biomaterials.
在本工作中，通过自由基聚合和反复冻融（F-T）过程，将聚乙烯醇（PVA）引入聚丙烯酰胺/聚丙烯酸（PAM/PAA）网络中，制备了新型的PAM/PAA/PVA三网络（TN）水凝胶。通过改变氯化钙（CaCl）和PVA的重量比以及自由成型，TN水凝胶不仅具有高机械强度，还具有适度的溶胀能力。所制备水凝胶的压缩应力可达11 MPa，最高拉伸应力可达0.8 MPa。在机械加载时，PAA和CaCl之间的配位网络作为牺牲键有效地耗散能量。然而，由于PAA和Ca之间的快速配位，当机械负载释放时它们可以重新形成。因此，TN水凝胶在生物材料方面具有潜在应用。
