研究人员通过融化聚合采用共价有机框架泡沫分离器

Special economic and environmental benefits in particular applications (for example, gas or liquid molecules) have been displayed by the adsorption-based isolation technologies.

研究人员通过融化聚合采用共价有机框架泡沫分离器。
Construct covalent organic frameworks foam separators by melt polymerization. Image Credit: ©Science China Press.

就工业应用而言,完美的高效吸附剂不仅需要高吸附能力或选择性,而且还需要良好的可加工性,机械稳定性和循环。因此,必须将吸附剂放在高稳定性的整体中(例如,气凝胶,膜,球体等)。

In recent times, the so-called COFs, as a developing class of advanced adsorbents, have illustrated several inspiring performances in several separation fields. But the majority of the advanced COF adsorbents still lack stability (mostly constructed by the reversible bond linkages), have low processability (majorly existing as microcrystalline powders), and have trouble with scalable synthesis.

因此,制定新策略来生成高度强的COF整体(例如,多孔泡沫)为实用应用而言非常重要。

通常,熔体聚合技术被用来制造线性聚合物。由于单体和聚合物都处于熔融形式,因此直接处理和形状很容易。在此激励的激励之后,来自南卡大学的张小组最初将所谓的“融化聚合”策略引入了COF综合。

通过添加苯甲烷作为通量,开发了一种“一步热成型”技术,以制造一系列烯烃连接的COF泡沫。

这是由于通量促进了单体发展的共晶剂,后者在加热时逐渐结晶,并最终凝固以产生高度结晶的COF泡沫(密度低至0.23 g/cm)3).

这种技术不仅可以改善报告的COF的孔隙率和结晶度,而且还可以帮助产生新的COF,而这些COF难以通过采用常规的溶剂热技术来实现。

For instance, a novel olefin-linked COF (NKCOF-12) with ultra-micropores measuring (0.58 nm) was synthesized initially by this method. These obtained foams illustrate outstanding mechanical properties and processability which are ideal for adsorption and separation.

油水选择性吸附实验表明,这种泡沫具有高效的油水分离(高达99%的去除效率),具有超高可重复使用性(超过100个周期)和易于回收。此外,在所有报道的Eclipslips堆叠2D COF中,NKCOF-12的孔尺寸最小。

NKCOF-12 has been attributed to its even ultramicroporous channel (0.58 nm) and enriched binding sites, and hence it exhibits outstanding C2H2/co2分离性能与更大的C2H2与基准材料相比,纯度(99.3%)。欧洲杯足球竞彩

这项工作仅提供了通过熔体聚合来构建COF泡沫的机会,但也大大推动了COF在实际应用中的增长。

Journal Reference:

张,P。,。(2022)一类强大的自形烯烃连接的COF泡沫作为高效分离器的融化聚合合成。Science China Chemistrydoi.org/10.1007/S11426-022-1224-3

来源:https://www.scichina.com/

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