新型纤维素/超级碱衍生离子液体溶液的流变学特性和再生纤维素膜的凝固过程,Green Chemistry

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新型纤维素/超级碱衍生离子液体溶液的流变学特性和再生纤维素膜的凝固过程
Green Chemistry ( IF 9.3 ) Pub Date : 2022-12-01 , DOI: 10.1039/d2gc03278c
Xiaoyu Wang ₁ , Wenqiu Zheng ₁ , Zongwei Guo ₂ , Haq Nawaz ₁ , Tingting You ₁ , Xin Li ₁ , Feng Xu _{1,

2}

Affiliation

通过溶解处理制备高性能再生纤维素（RC）材料取决于纤维素溶液的性质和凝固浴的条件。在此，一种新型可持续的超级碱衍生离子液体（SIL，[DBUH][CH ₃ CH ₂ OCH ₂ COO]）具有优异的溶解度（在 80 °C 时为 14.83 wt%），用于溶解木浆（DWP；DP = 526）证明。首先系统地研究了DWP/[DBUH][CH ₃ CH ₂ OCH ₂ COO]溶液的流变特性和纤维素的再生过程。结果表明，DWP浓度显着影响表观粘度（η)、结构粘度指数 (Δ η )、重叠浓度 ( c *)、缠结浓度 ( c _e )、储能模量 ( G ') 和损耗模量 ( G '')。值得注意的是，12 wt% DWP 溶液具有良好的温度敏感特性，活化能 ( E _η ) 为 55.428 kJ mol ^-1凝胶-溶胶转变温度为 59.5 °C，在纤维纺丝中表现出优于咪唑基离子液体/纤维素的粘弹性。此外，DWP 溶液的这些特性为随后的 RC 薄膜制备提供了重要的优势。比较在各种凝固浴中制备的 RC 薄膜的性能，从乙醇再生的纤维素薄膜表现出高透明度（在 800 nm 时高达 90%）和出色的机械性能（拉伸强度：120 MPa；断裂伸长率：12%）。在这方面，据推测，[DBUH][CH ₃ CH ₂ OCH ₂ COO] 和乙醇之间的扩散速率有助于构建具有高结晶度和致密形态的 RC 薄膜。因此，[DBUH][CH ₃ CH₂ OCH₂ COO]作为溶剂和乙醇作为凝固浴可以成为制造高性能纤维素材料的有前途的加工平台。

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Rheological characteristics of novel cellulose/superbase-derived ionic liquid solutions and the coagulation process towards regenerated cellulose films

The preparation of regenerated cellulose (RC) materials with high performance via dissolution processing is dependent on the properties of the cellulose solution and the conditions of the coagulation bath. Herein, a novel sustainable superbase-derived ionic liquid (SIL, [DBUH][CH₃CH₂OCH₂COO]) with excellent solubility (14.83 wt% at 80 °C) for dissolving wood pulp (DWP; DP = 526) is demonstrated. The rheological characteristics of DWP/[DBUH][CH₃CH₂OCH₂COO] solutions and the regeneration process of cellulose were first systematically investigated. The results indicated that the DWP concentration significantly affected the apparent viscosity (η), structural viscosity index (Δη), overlap concentration (c*), entanglement concentration (c_e), storage modulus (G′), and loss modulus (G′′). Notably, a 12 wt% DWP solution possessed favourable temperature-sensitive properties with an activation energy (E_η) of 55.428 kJ mol⁻¹ and a gel–sol transition temperature of 59.5 °C, presenting superior viscoelasticity to that of imidazolium-based ILs/cellulose in fibre spinning. Moreover, these properties of DWP solutions offered essential advantages for the subsequent preparation of RC films. Comparing the properties of RC films prepared in various coagulation baths, cellulose films regenerated from ethanol exhibited high transparency (up to 90% at 800 nm) and outstanding mechanical properties (tensile strength: 120 MPa; elongation at break: 12%). In this regard, it was inferred that the diffusion rates between [DBUH][CH₃CH₂OCH₂COO] and ethanol contributed to the construction of RC films with high crystallinity and a dense morphology. Hence, [DBUH][CH₃CH₂OCH₂COO] as a solvent and ethanol as a coagulation bath can be a promising processing platform for manufacturing high-performance cellulose materials.

更新日期：2022-12-01

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