Dual Ionic Liquid-Functionalized Cellulosic Materials: Thermal, Conductive, and Morphological Properties
Dual Ionic Liquid-Functionalized Cellulosic Materials: Thermal, Conductive, and Morphological Properties
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DOI：
10.1021/acsapm.3c02815
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发表时间：
2024-02
影响因子：
5
通讯作者：
Elizabeth A. Hays;Gabrielle Eicher;Abneris Morales;David Salas-de la Cruz;Kevin M. Miller
中科院分区：
文献类型：
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作者：
Elizabeth A. Hays;Gabrielle Eicher;Abneris Morales;David Salas-de la Cruz;Kevin M. Miller
通过将一系列带有可变碳间隔基的炔基端咪唑与叠氮基功能化纤维素偶联，然后进行季铵化和阴离子交换，制备了双离子液体取代的纤维素材料。所有三种含[NTf 2]的纤维素材料的Tg值均低于零，并且可以流延成柔性膜，其断裂应力值超过2.3 MPa，断裂应变值高达252%。X-射线散射分析表明纤维素材料的无定形性质，观察到三个散射峰，从高到低q，分别对应于无定形晕，阴离子-阴离子距离，和离子聚集体之间的距离。最高程度的离子聚集被发现存在于theCELL-C12-NTf 2材料，大概是由于较长的烷基链导致更均匀的interaggregate间距。在30 °C时，薄膜的电导率为10 ~（-5）~ 10 ~（-6）S/cm。电导率随温度的缓慢增加，观察到离子聚集最强的系统。
Dual ionic liquid-substituted cellulosic materials were prepared by coupling a series of alkyne-terminated imidazoles with variable carbon spacer with azide-functionalized cellulose, followed by quaternization and anion exchange. All three of the [NTf2]-bearing cellulosic materials exhibitedTgvalues below zero and could be cast as flexible films, which exhibited stress at break values exceeding 2.3 MPa with strain at break values up to 252%. X-ray scattering analyses indicated the amorphous nature of the cellulosic materials with three scattering peaks observed, from high-to-lowq, corresponding to the amorphous halo, anion-to-anion distance, and the distance between ion aggregates, respectively. The highest degree of ionic aggregation was found to exist in theCELL-C12-NTf2material, presumably due to the longer alkyl tethers causing more uniformity in the interaggregate spacing. The conductivity of the films was found to be on the order of 10–5–10–6S/cm at 30 °C. A slower increase in conductivity with temperature was observed for systems where ionic aggregation was the strongest.