Tough nanocomposite double network hydrogels reinforced with clay nanorods through covalent bonding and reversible chain adsorption
文献类型：期刊论文
| 作者 | Gao, Guorong ; Du, Gaolai ; Cheng, Yajun ; Fu, Jun |
| 刊名 | JOURNAL OF MATERIALS CHEMISTRY B
 |
| 出版日期 | 2014 |
| 卷号 | 2期号:11页码:1539 |
| 中文摘要 | Polymer hydrogels with superior strength and toughness are potential candidate materials for the replacement or engineering of load-bearing tissues. This manuscript reports novel tough nanocomposite hydrogels with an unusual energy dissipation mechanism based on both covalent and physical interactions between clay nanorods and polymer chains. Attapulgite (ATP) nanorods grafted with vinyl groups on the surface served as macro-crosslinkers to copolymerize with 2-acrylamido-2-methylpropane-sulfonic acid (AMPS) to form an initial nanocomposite network, which subsequently hosted the polymerization of acrylamide (AAm) monomers to generate a novel nanocomposite double network (DN) hydrogel. The morphology, swelling behavior and compressive properties of the ATP-grafted DN hydrogels were investigated as a function of ATP content (C-ATP), in comparison with the ATP-filled DN gels. With a clay content between 0.1 wt% and 1.0 wt%, the nanocomposite hydrogels did not fracture up to a compressive strain of 98%, exhibiting an initial modulus (E) up to 0.36 MPa, a compressive strength higher than 65.7 MPa, and a work to fracture (or fracture energy) higher than 2.6 MJ m(-3), in comparison to 0.19 MPa, 18.6 MPa, and 1.1 MJ m(-3) for the conventional DN gels. Cyclic loading-unloading tests showed abnormal residual energy dissipation even though the rigid PAMPS network had fractured. Such viscous energy dissipation decayed during cyclic loading, and could be restored depending on time and temperature. This is related to the reversible desorption-re-adsorption of polymer chains from the clay surface. Possible reinforcing and fracture mechanisms are discussed. |
| 公开日期 | 2015-09-20 |
| 源URL | [http://ir.nimte.ac.cn/handle/174433/12041]  |
| 专题 | 宁波材料技术与工程研究所_2014专题 |
| 推荐引用方式 GB/T 7714 | Gao, Guorong,Du, Gaolai,Cheng, Yajun,et al. Tough nanocomposite double network hydrogels reinforced with clay nanorods through covalent bonding and reversible chain adsorption[J]. JOURNAL OF MATERIALS CHEMISTRY B,2014,2(11):1539. |
| APA | Gao, Guorong,Du, Gaolai,Cheng, Yajun,&Fu, Jun.(2014).Tough nanocomposite double network hydrogels reinforced with clay nanorods through covalent bonding and reversible chain adsorption.JOURNAL OF MATERIALS CHEMISTRY B,2(11),1539. |
| MLA | Gao, Guorong,et al."Tough nanocomposite double network hydrogels reinforced with clay nanorods through covalent bonding and reversible chain adsorption".JOURNAL OF MATERIALS CHEMISTRY B 2.11(2014):1539. |
入库方式： OAI收割
来源：宁波材料技术与工程研究所
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