Efficient Cellulose Dissolution and Film Formation Enabled by Superbase Amino Acid Ionic Liquids,Macromolecular Rapid Communications

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Efficient Cellulose Dissolution and Film Formation Enabled by Superbase Amino Acid Ionic Liquids
Macromolecular Rapid Communications ( IF 4.2 ) Pub Date : 2023-05-24 , DOI: 10.1002/marc.202300175
Junmeng Zhao ₁ , Wenjiao Ge ₁ , Jianbo Shuai ₁ , Xiangli Gao ₁ , Fengshan Zhang ₂ , Xiaohui Wang ₁

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Cellulose is a promising feedstock for the production of sustainable materials. To fully utilize its potential, exploring efficient cellulose solvents is a paramount prerequisite. In this study, ten superbase amino acid ionic liquids (SAAILs) are synthesized using 1,5-diazabicyclo[4.3.0]non-5-ene (DBN) and 1,8-diazabicyclo[5.4.0]undec-7-ene (DBU) with different amino acid anions via a simple neutralization method. The properties of these SAAILs, such as viscosity and glass transition temperature, varied with their cation and anion structures. The ability of the SAAILs to dissolve cellulose is related to their Kamlet–Taft parameters, particularly hydrogen bond basicity (β). The main driving force for cellulose dissolution in SAAILs is thought to be hydrogen bonding interactions between SAAILs and cellulose hydroxyl groups. Four SAAILs composed of DBN or DBU cations and proline, or aspartic acid anions are identified as promising solvents for preparing regenerated cellulose films (RCFs). The RCF prepared from [DBN]Proline(Pro) showed a favorable combination of high tensile strength (76.9 MPa), high Young's modulus (5201.2 MPa), good transparency (≈70% at 550 nm), and smooth surface morphology. These halogen- and metal-free SAAILs show the potential to provide a new avenue for cellulose processing.

中文翻译：

超强碱氨基酸离子液体实现高效纤维素溶解和成膜

纤维素是生产可持续材料的有前途的原料。为了充分发挥其潜力，探索高效的纤维素溶剂是首要前提。在这项研究中，使用1,5-二氮杂双环[4.3.0]non-5-ene (DBN)和1,8-二氮杂双环[5.4.0]undec-7-ene合成了十种超强碱氨基酸离子液体(SAAIL) (DBU)通过简单的中和方法与不同的氨基酸阴离子结合。这些 SAAIL 的特性（例如粘度和玻璃化转变温度）随其阳离子和阴离子结构而变化。SAAIL 溶解纤维素的能力与其 Kamlet-Taft 参数有关，特别是氢键碱度 ( β )。SAAIL 中纤维素溶解的主要驱动力被认为是 SAAIL 与纤维素羟基之间的氢键相互作用。四种由 DBN 或 DBU 阳离子和脯氨酸或天冬氨酸阴离子组成的 SAAIL 被认为是制备再生纤维素膜 (RCF) 的有前途的溶剂。由[DBN]脯氨酸(Pro)制备的RCF显示出高拉伸强度(76.9 MPa)、高杨氏模量(5201.2 MPa)、良好透明度(约70%，550 nm)和光滑表面形态的良好组合。这些不含卤素和金属的 SAAIL 显示出为纤维素加工提供新途径的潜力。

更新日期：2023-05-24

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