通过分散张力制备超高强度弹性聚合物网络
Elastic polymer networks of exceptional strength by deconcentrating tension
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中文总结 AI 辅助
本研究针对聚合物网络强度远低于单链的问题，通过分散张力让更多链承受高张力，制备出强度达10 MPa的水凝胶与弹性体，明确强度与链长的标度关系，为高强度弹性聚合物网络提供设计原则。
中文摘要 AI 辅助
聚合物网络的强度比单个聚合物链低几个数量级，原因在于网络会将高张力集中在一小部分聚合物链上。本文展示，通过让更大比例的链承受高张力，可大幅提升网络强度。我们开发了制备兼具超高强度与低滞后性水凝胶的方法，其强度从常规网络的约0.05 MPa，提升至高度缠结网络的约1 MPa，进一步提升至预拉伸互穿网络的约10 MPa；弹性体也实现了类似的强度提升。此外，实验数据表明强度与链长存在标度关系，本研究为制备兼具弹性与高强度的聚合物网络提供了设计原则。
英文摘要
The strength of a polymer network is orders of magnitude below that of a polymer chain, because the network concentrates high tension in a small fraction of polymer strands. Here we show that the strength of a network can be greatly amplified by recruiting a larger fraction of strands to bear high tension. We develop approaches to fabricate hydrogels of exceptional strength while maintaining low hysteresis. The strength of the hydrogel increases from ~0.05 MPa for a regular network, to ~1 MPa for a highly entangled network, and further to ~10 MPa for a prestretched interpenetrating network. Similar amplifications of strength are achieved for elastomers. Furthermore, experimental data suggest a scaling relation between strength and strand length. This work provides design principles for creating elastic and strong polymer networks.
发表机构
- John A. Paulson School of Engineering and Applied Sciences, Harvard University（哈佛大学约翰·A·保尔森工程与应用科学学院）
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