Polyelectrolyte Complexes as Desiccants: Thirsty Saloplastics
Polyelectrolyte Complexes as Desiccants: Thirsty Saloplastics
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作为干燥剂的聚电解质复合物：口渴的液体塑料
DOI：
10.1021/acsami.2c19934
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发表时间：
2023
影响因子：
9.5
通讯作者：
Schlenoff, Joseph B.
中科院分区：
文献类型：
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作者：
Akintola, John;Digby, Zachary A.;Schlenoff, Joseph B.
干燥剂或干燥剂广泛用于从液体和气体中除去水。许多有机反应，从实验室到工业规模，甚至对微量的水都很敏感。利用带电聚合物重复单元对水的亲和力，本文介绍了一类由复合聚电解质（佩奇）制成的新型干燥剂。首次使用干燥佩奇的水合焓作为PEC水亲和力的定量测量。使用阳性聚合物Pol+和阴性聚合物Pol-的几种组合来制备佩奇。所有这些都显示出显着的放热（有利的）水化，在室温下使用溶液量热法测量。由聚（二烯丙基二甲基铵）和聚（苯乙烯磺酸盐）制成的PEC被挤出成方便的形状。该PEC用于干燥三种常见溶剂，乙腈、四氢呋喃和甲苯，代表一系列极性。添加的水用氚放射性标记，以提供处理后残留水的准确和灵敏的检测。在静态干燥3天后，该PEC几乎与比较干燥剂分子筛3A和硫酸钙一样有效，但可以在较低温度（120 °C）下再生，并且脱落的灰尘颗粒少得多。
Desiccants or drying agents are used extensively to remove water from liquids and gases. Many organic reactions, from the laboratory to the industrial scale, are sensitive to even trace amounts of water. A new class of desiccants made from complexed polyelectrolytes, PECs, is described here, exploiting the affinity of charged polymer repeat units for water. The enthalpy of hydration of dry PECs was used for the first time as a quantitative measure of PEC water affinity. Several combinations of positive, Pol+, and negative, Pol–, polymers were used to prepare PECs. All of these displayed significant exothermic (favorable) enthalpies of hydration, measured at room temperature using solution calorimetry. A PEC made from poly(diallyldimethylammonium) and poly(styrene sulfonate) was extruded into convenient shapes. This PEC was used to dry three common solvents, acetonitrile, tetrahydrofuran, and toluene, representing a range of polarities. Added water was radiolabeled with tritium to provide accurate and sensitive detection of residual water after treatment. This PEC was almost as efficient as the comparison desiccants, molecular sieve 3A and calcium sulfate, after 3 days of static drying but could be regenerated at a lower temperature (120 °C) and shed far fewer dust particles.