Quaternary Ammonium-Functionalized Poly(Arylene Ether Sulfone) Random Copolymers for Direct Air Capture
Quaternary Ammonium-Functionalized Poly(Arylene Ether Sulfone) Random Copolymers for Direct Air Capture
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DOI：
10.1021/acs.macromol.3c00760
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发表时间：
2023-08
期刊：
影响因子：
5.5
通讯作者：
Hoda Shokrollahzadeh Behbahani;Husain Mithaiwala;Horacio Lopez Marques;Winston Wang;B. Freeman;M. Green
中科院分区：
文献类型：
--
作者：
Hoda Shokrollahzadeh Behbahani;Husain Mithaiwala;Horacio Lopez Marques;Winston Wang;B. Freeman;M. Green
直接空气捕获（DAC）是降低大气中二氧化碳浓度和应对气候变化的一种很有前途的工具。我们合成了一系列具有不同电荷含量摩尔分数的季铵 (QA) 官能化聚（亚芳基醚砜）共聚物，并证明了它们作为 DAC 吸附剂的潜力。分子量分析确定，在 <6 小时内实现了高单体转化率，并且所有共聚物组合物的分子量都相对较高。热分析表明，所有聚合物的降解温度均>240 °C，且玻璃化转变温度 (Tg) 单一；Tg 随着离子交换容量 (IEC) 的增加而降低。与中性市售聚砜 (Udel P-1700 PSU) 相比，随着 QA 位点数量的增加，自由体积和吸水率增加，水接触角减小。接下来，新型铵官能化共聚物系列表现出湿气介导的大气二氧化碳捕获和释放。当暴露在相对湿度为 30% 的空气中时，聚合物捕获 CO2，并且容量随着 IEC 的增加而增加。当相对湿度增加到 95% 时，样品释放出二氧化碳。这项研究展示了一种有前途的 CO2DAC 吸附剂，并强调了使用专用独立式膜进行连续 DAC 的可能性。
Direct air capture (DAC) is a promising tool for reducing CO2concentrations in the atmosphere and fighting climate change. We synthesized a series of quaternary ammonium (QA)-functionalized poly(arylene ether sulfone) copolymers with varying mole fractions of charge content and demonstrated their potential as sorbents for DAC. Molecular weight analysis determined that a high monomer conversion was achieved in <6 h and relatively high molecular weights for all copolymer compositions. Thermal analysis revealed that all polymers had degradation temperatures >240 °C and a single glass-transition temperature (Tg);Tgdecreased with an increase in ion exchange capacity (IEC). Fractional free volume and water uptake percentage increased and water contact angle decreased with the number of QA sites when compared to a neutral, commercially available polysulfone (Udel P-1700 PSU). Next, the novel series of ammonium-functionalized copolymers exhibited a moisture-mediated capture and release of atmospheric CO2. When exposed to air containing 30% relative humidity, the polymers captured CO2, and the capacity increased with the IEC. When the relative humidity was increased to 95% the samples released CO2. This study demonstrates a promising CO2DAC sorbent and highlights the possibility for continuous DAC with purpose-built freestanding membranes.