Channell Megan N, Sefa Makfir, Fedchak James A, Scherschligt Julia, Bible Michael, Natarajan Bharath, Klimov Nikolai N, Miller Abigail E, Ahmed Zeeshan, Hartings Matthew R
Department of Chemistry, American University, 4400 Massachusetts Ave., NW, Washington, DC 20016, USA.
Thermodynamic Metrology Group, Sensor Science Division, Physical Measurement Laboratory, National Institute of Standards and Technology, Gaithersburg, MD 20899, USA.
Polym Adv Technol. 2018 Feb;29(2):867-873. doi: 10.1002/pat.4197. Epub 2017 Oct 19.
The push to advance efficient, renewable, and clean energy sources has brought with it an effort to generate materials that are capable of storing hydrogen. Metal-organic framework materials (MOFs) have been the focus of many such studies as they are categorized for their large internal surface areas. We have addressed one of the major shortcomings of MOFs (their processibility) by creating and 3D printing a composite of acrylonitrile butadiene styrene (ABS) and MOF-5, a prototypical MOF, which is often used to benchmark H uptake capacity of other MOFs. The ABS-MOF-5 composites can be printed at MOF-5 compositions of 10% and below. Other physical and mechanical properties of the polymer (glass transition temperature, stress and strain at the breaking point, and Young's modulus) either remain unchanged or show some degree of hardening due to the interaction between the polymer and the MOF. We do observe some MOF-5 degradation through the blending process, likely due to the ambient humidity through the purification and solvent casting steps. Even with this degradation, the MOF still retains some of its ability to uptake H, seen in the ability of the composite to uptake more H than the pure polymer. The experiments and results described here represent a significant first step toward 3D printing MOF-5-based materials for H storage.
推动高效、可再生和清洁能源发展的同时，人们也在努力研发能够储存氢气的材料。金属有机框架材料（MOFs）因其较大的内表面积而成为众多此类研究的焦点。我们通过创建并3D打印丙烯腈丁二烯苯乙烯（ABS）与MOF-5（一种典型的MOF，常用于衡量其他MOFs的氢吸收能力）的复合材料，解决了MOFs的一个主要缺点（其可加工性）。ABS-MOF-5复合材料可以在MOF-5含量为10%及以下的情况下进行打印。聚合物的其他物理和机械性能（玻璃化转变温度、断裂点处的应力和应变以及杨氏模量）要么保持不变，要么由于聚合物与MOF之间的相互作用而呈现出一定程度的硬化。我们确实观察到在混合过程中MOF-5有一些降解，这可能是由于在纯化和溶剂浇铸步骤中受到环境湿度的影响。即便有这种降解，MOF仍然保留了一些吸氢能力，这体现在复合材料比纯聚合物能吸收更多氢气上。这里描述的实验和结果代表了朝着3D打印用于储氢的基于MOF-5的材料迈出的重要第一步。
