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Recoverable hydrogel with high stretchability and toughness achieved by low-temperature hydration of Portland cement†
Materials Chemistry Frontiers ( IF 7 ) Pub Date : 2018-09-14 00:00:00 , DOI: 10.1039/c8qm00391b
Rui Liang 1, 2, 3, 4, 5 , Zongjin Li 4, 5, 6, 7, 8 , Lu-Tao Weng 2, 3, 9 , Lina Zhang 3, 10, 11, 12 , Guoxing Sun 4, 5, 6, 7, 8
Affiliation  

A novel calcium hydroxide nanospherulite (CNS) strengthened super elastic hydrogel with excellent mechanical properties has been successfully invented and investigated. The CNSs are one major hydration product of cement hydrated at low temperature. They are incorporated into the hydrogel polymer network through the Ca2+ ions diffusing from the cement particles into the hydrogel matrix first and then forming calcium hydroxide nanospherulites with diameters <4 nm uniformly in the matrix. This develops an innovative method to form such nanometer-sized calcium hydroxide. The uniformly distributed 4 nm-sized spherulites formed by such a method can act as a crosslinker and hence enhance the properties of the hydrogel remarkably. By incorporating about 40 ppm of 4 nm-sized calcium hydroxide spherulites, the modified hydrogel sample can be stretched to 112 times of its initial length without breaking and withstand a maximum stress of 400 kPa. The strain recovery rate Rr, which is defined as the ratio of recovered strain to the maximum strain, increases from 18.0% for the original hydrogel to 96.7% for the hydrogel with incorporation of around 200 ppm 4 nm-sized calcium hydroxide spherulites. This research contributes to the field with a unique formulation method of uniformly distributed 4 nm or smaller nanoparticles acting as crosslinkers of a hydrogel, achieving enhancement of the excellent overall mechanical properties for the hydrogel. It opens a new direction for nanoparticle strengthened material development by controlling the nanoparticle size from hydrolyzing the matrix.

中文翻译:

硅酸盐水泥的低温水化可实现具有高拉伸性和韧性的可回收水凝胶

新型的氢氧化钙纳米球(CNS)增强超弹性水凝胶具有优异的机械性能已被成功地发明和研究。CNS是在低温下水合的水泥的一种主要水合产物。它们通过Ca 2+结合到水凝胶聚合物网络中离子首先从水泥颗粒扩散到水凝胶基质中,然后在基质中均匀形成直径<4 nm的氢氧化钙纳米球。这开发了形成这种纳米级氢氧化钙的创新方法。通过这种方法形成的均匀分布的4nm尺寸的球晶可以用作交联剂,因此显着提高了水凝胶的性能。通过掺入约40 ppm的4 nm大小的氢氧化钙球晶,可以将改性的水凝胶样品拉伸至其初始长度的112倍而不会断裂,并能承受400 kPa的最大应力。应变恢复率R r定义为恢复的应变与最大应变的比率,从原来的水凝胶的18.0%增加到水凝胶的96.7%,其中掺入了约200 ppm的4 nm大小的氢氧化钙球晶。这项研究以独特的配方方法为该领域做出了贡献,该方法均匀地分布了4 nm或更小的纳米颗粒,用作水凝胶的交联剂,从而增强了水凝胶的出色整体机械性能。通过控制水解基质的纳米颗粒尺寸,它为纳米颗粒增强材料的开发开辟了新的方向。
更新日期:2018-09-14
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