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A Self-Healing Cellulose Nanocrystal-Poly(ethylene glycol) Nanocomposite Hydrogel via Diels–Alder Click Reaction
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-05-31 00:00:00 , DOI: 10.1021/acssuschemeng.7b01060 Changyou Shao 1 , Meng Wang 1 , Huanliang Chang 1 , Feng Xu 1 , Jun Yang 1
ACS Sustainable Chemistry & Engineering ( IF 7.1 ) Pub Date : 2017-05-31 00:00:00 , DOI: 10.1021/acssuschemeng.7b01060 Changyou Shao 1 , Meng Wang 1 , Huanliang Chang 1 , Feng Xu 1 , Jun Yang 1
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Self-healing hydrogels are particularly desirable for increased safety and functional lifetimes because of stress-induced deformation and propagation of cracks. In this paper, we report a tough, highly resilient, fast self-recoverable, and self-healing nanocomposite hydrogel, which builds an interpenetrated network encapsulating rod-like cellulose nanocrystals (CNCs) by flexible polymer chains of poly(ethylene glycol) (PEG). A thermally reversible covalent Diels–Alder click reaction between furyl-modified CNCs and maleimide-end-functionalized PEG was confirmed by Fourier transform infrared spectroscopy. Uniaxial tensile tests and unconfined compression tests displayed outstanding mechanical properties of the hydrogels with a high fracture elongation up to 690% and a fracture strength up to 0.3 MPa at a strain of 90%. Cyclic loading–unloading tests showed excellent self-recovery and antifatigue properties of the nanocomposite hydrogels. The self-healing capability of nanocomposite hydrogels assessed by tension tests was found to be as high as 78%. The self-healing CNC-PEG nanocomposite hydrogels would shed insight into designing reusable and renewable polymeric hydrogels.
中文翻译：
通过Diels-Alder Click反应自修复的纤维素纳米晶体-聚乙二醇纳米复合水凝胶
由于应力引起的变形和裂纹的扩展，自愈水凝胶对于提高安全性和功能寿命特别理想。在本文中，我们报告了一种坚韧，高弹性，快速自恢复和自修复的纳米复合水凝胶，该凝胶通过聚乙二醇（PEG）（PEG）的柔性聚合物链构建了互穿网络，从而包裹了棒状纤维素纳米晶体（CNC）。 ）。傅立叶变换红外光谱法证实了呋喃基修饰的CNC与马来酰亚胺末端官能化PEG之间的热可逆共价Diels-Alder点击反应。单轴拉伸试验和无限制压缩试验显示了水凝胶的出色机械性能，在90％的应变下，断裂伸长率高达690％，断裂强度高达0.3 MPa。循环加载/卸载测试表明，纳米复合水凝胶具有出色的自我恢复和抗疲劳性能。通过拉伸试验评估的纳米复合水凝胶的自愈能力高达78％。具有自我修复功能的CNC-PEG纳米复合水凝胶将使人们对设计可重复使用和可再生的聚合物水凝胶有深入的了解。
更新日期：2017-06-28
中文翻译：
通过Diels-Alder Click反应自修复的纤维素纳米晶体-聚乙二醇纳米复合水凝胶
由于应力引起的变形和裂纹的扩展，自愈水凝胶对于提高安全性和功能寿命特别理想。在本文中，我们报告了一种坚韧，高弹性，快速自恢复和自修复的纳米复合水凝胶，该凝胶通过聚乙二醇（PEG）（PEG）的柔性聚合物链构建了互穿网络，从而包裹了棒状纤维素纳米晶体（CNC）。 ）。傅立叶变换红外光谱法证实了呋喃基修饰的CNC与马来酰亚胺末端官能化PEG之间的热可逆共价Diels-Alder点击反应。单轴拉伸试验和无限制压缩试验显示了水凝胶的出色机械性能，在90％的应变下，断裂伸长率高达690％，断裂强度高达0.3 MPa。循环加载/卸载测试表明，纳米复合水凝胶具有出色的自我恢复和抗疲劳性能。通过拉伸试验评估的纳米复合水凝胶的自愈能力高达78％。具有自我修复功能的CNC-PEG纳米复合水凝胶将使人们对设计可重复使用和可再生的聚合物水凝胶有深入的了解。
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