Freezing Molecular Orientation under Stretch for High Mechanical Strength but Anisotropic Hydrogels | |
Lin P(林鹏)1,2; Zhang TT(张婷婷)1,2; Wang XL(王晓龙)1; Yu B(于波)1; Zhou F(周峰)1; Zhou F(周峰) | |
刊名 | Small |
2016 | |
卷号 | 12期号:32页码:4386-4392 |
ISSN号 | 1613-6810 |
通讯作者 | 周峰 |
英文摘要 | The poor mechanical strength of hydrogels has largely limited their wide applications, and improving hydrogels' mechanical strength is a hot and important topic in the hydrogel research field. Although many successful strategies have been proposed to improve hydrogels' mechanical strength during the past decades, a hydrogel with a tensile stress surpassing dozens of mega Pascal is desirable, yet still a big challenge. To address this issue, the Fe3+-mediated physical crosslinking formed under stretch conditions was employed in a chemically crosslinked poly (acrylamide-co-acrylic acid) network to achieve a dual-crosslinked hydrogel. The expected molecular orientation occurs under stretch and allows the maximumu chelating interaction between pendant carboxylic anions and Fe3+ and molecules conformation being frozen, leading to the mechanical strength improving dramatically. As a result, an unprecedentedly high mechanical strength, but anisotropic dual-crosslinked hydrogel was obtained. By optimizing the experimental parameters, the nominal tensile stress along pre-stretching direction can reach as high as ≈40 MPa with elastic modulus of ≈40 MPa at large strain (>200%). In addition, the molecular orientation also leads to big difference of mechanical performance between parallel and perpendicular direction. |
学科主题 | 材料科学与物理化学 |
收录类别 | SCI |
资助信息 | NSFC (Grant Nos. 21434009;51573199) |
语种 | 英语 |
WOS记录号 | WOS:000383376700009 |
内容类型 | 期刊论文 |
源URL | [http://210.77.64.217/handle/362003/20486] |
专题 | 兰州化学物理研究所_固体润滑国家重点实验室 |
通讯作者 | Zhou F(周峰) |
作者单位 | 1.Chinese Acad Sci, Lanzhou Inst Chem Phys, State Key Lab Solid Lubricat, Lanzhou 730000, Peoples R China 2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China |
推荐引用方式 GB/T 7714 | Lin P,Zhang TT,Wang XL,et al. Freezing Molecular Orientation under Stretch for High Mechanical Strength but Anisotropic Hydrogels[J]. Small,2016,12(32):4386-4392. |
APA | Lin P,Zhang TT,Wang XL,Yu B,Zhou F,&周峰.(2016).Freezing Molecular Orientation under Stretch for High Mechanical Strength but Anisotropic Hydrogels.Small,12(32),4386-4392. |
MLA | Lin P,et al."Freezing Molecular Orientation under Stretch for High Mechanical Strength but Anisotropic Hydrogels".Small 12.32(2016):4386-4392. |
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