Preparation of Cellulose Films from Sustainable CO2/DBU/DMSO System

Jin, Longming; Gan, Jianyun; Hu, Gang; Long, Cai; Li, Zaiquan; Zhang, Lihua; Zheng, Qiang; Xie, Haibo

doi:10.3390/polym11060994

Cited by 26 publications

(19 citation statements)

References 43 publications

(46 reference statements)

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“…2.2 GPa. As rapidly regenerated cellulose films typically have high crystallinity (40% to 50%), composite films intentionally prepared with cellulose from coil solutions should remain in an amorphous state and possess properties similar to amorphous films in a previous study [31,49]. Indeed, the ductility increases at >20% AC, as shown in Figure 4d.…”

Section: Mechanical and Fracture Surface Analysismentioning

confidence: 62%

Cellulose Nanocomposites of Cellulose Nanofibers and Molecular Coils

et al. 2021

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All-cellulose nanocomposites have been produced from cellulose nanofiber (CNF) suspensions and molecular coil solutions. Morphology and small-angle neutron scattering studies show the exfoliation and dispersion of CNFs in aqueous suspensions. Cellulose solutions in mixtures of ionic liquid and organic solvents were homogeneously mixed with CNF suspensions and subsequently dried to yield cellulose composites comprising CNF and amorphous cellulose over the entire composition range. Tensile tests show that stiffness and strength quantities of cellulose nanocomposites are the highest value at ca. 20% amorphous cellulose, while their fracture strain and toughness are the lowest. The inclusion of amorphous cellulose in cellulose nanocomposites alters their water uptake capacity, as measured in the ratio of the absorbed water to the cellulose mass, reducing from 37 for the neat CNF to less than 1 for a composite containing 35% or more amorphous cellulose. This study offers new insights into the design and production of all-cellulose nanocomposites.

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Section: Mechanical and Fracture Surface Analysismentioning

confidence: 62%

Cellulose Nanocomposites of Cellulose Nanofibers and Molecular Coils

et al. 2021

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“…40 Surprisedly, the RCM-3 and RCM-4 show similar diffractions at 12.3, 20.1, and 21.7°a ssigned to (11̅ 0), (110), and (020) crystal planes, implying their cellulose II crystal structures. 41,42 The findings indicate that some kinds of recrystallization of cellulose molecular segments occur, induced by acidic or alkaline aqueous coagulation baths. The CrI of original cellulose was calculated to be 0.76, and those of the RCM-3 and RCM-4 were lowered to 0.57 and 0.61, respectively.…”

Section: Otrmentioning

confidence: 93%

Cellulose Membranes from Cellulose CO₂-Based Reversible Ionic Liquid Solutions

Guo

Long

Guo

et al. 2021

ACS Sustainable Chem. Eng.

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Regenerated cellulose membranes (RCMs) were p r e p a r e d f r o m c e l l u l o s e s u ffi c i e n t l y d i s s o l v e d i n [TMGH] 2 +[OOCOCH 2 CH 2 OCOO] 2− /DMSO (X ILS = 0.2, X ILs is the mole fraction of reversible ionic liquids in the mixed solvents) mixed solution under mild conditions (50 °C, 3 h, P CO 2 = 0.2 MPa) using different coagulation baths of ethanol, methanol, NaOH, and H 2 SO 4 aqueous solutions. The structure and properties of these membranes were characterized using various characteristic technologies. The membrane regenerated from ethanol exhibited good thermostability and mechanical, water vapor, and oxygen barrier properties with a tensile strength of 56.2 MPa, a tensile strain of 20.4%, an excellent water vapor permeability of 8.7 × 10 −3 g μm/m 2 day kPa, and an oxygen permeability (OP) of 4.087 cm 3 μm/m 2 day atm. The membranes regenerated from aqueous solutions of alkali and acid have an OP that tends to zero. This study provides a novel dissolving strategy to prepare cellulose membranes that have potential applications in the packaging, food, and agricultural industries.

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“…However, second-generation bioethanol is still no more than a possible option at present because the energy input required to produce bioethanol from lignocellulose is greater than the energy obtained from the ethanol produced. Potential cellulose solvents have been developed, including sodium hydroxide aqueous solutions, − N -methylmorpholine- N -oxide monohydrate (NMMO·H 2 O), LiCl/ N , N -dimethylacetamide, − dimethyl sulfoxide (DMSO)/tetrabutylammonium fluoride, and DMSO/base/CO 2 , which have good ability to dissolve cellulose. However, they have several drawbacks such as explosive nature, thermal instability, and toxicity, which prevent their practical application.…”

Section: Introductionmentioning

confidence: 99%

Essential Requirements of Biocompatible Cellulose Solvents

Komori

Satria

Miyamura

et al. 2021

ACS Sustainable Chem. Eng.

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Energy-efficient bioethanol production from plant biomass is in high demand, and one of the most promising procedures reported to date is one-pot ethanol production, that is, the production of ethanol from biomass in the same reaction pot, such as industrial first-generation bioethanol. This process requires cellulose solvents whose toxicity toward fermentative microorganisms is extremely low. Herein, we have developed a low-toxic zwitterionic cellulose solvent known as 4-(1-(2-(2-methoxyethoxy)ethyl)imidazol-3-io)butyrate (OE2imC3C). OE2imC3C is the only reported solvent that satisfies the following properties: being liquid at mild temperature and having good cellulose dissolution ability and low toxicity, even when including other types of solvents. We here investigated the relationship between the chemical structures and properties by synthesizing 22 zwitterions. Long alkyl- or oligoether chains attached to the cation (cation tails) were necessary to be a liquid. The zwitterions, except for that with an octyl tail, exhibited biocompatibility. Interestingly, the spacers of the zwitterions, alkyl chains between the cations and anions, were expected to be inert, but affected the toxicity. The molecular mechanisms were investigated using molecular dynamics simulations. The zwitterions exhibiting low toxicity scarcely inserted their cation tails into cell membrane and thus did not rupture the cell membrane. Ionic liquids, which have free cations and anions, induced molecular-level disruption of the cell membrane, suggesting that the zwitterion structure is a critical factor for low toxicity. The spacers, which were expected to be inert, shifted the solvent cluster structures in the bulk phase and induced molecular-level disruption of the cell membrane. The requirements for low-toxic cellulose solvents are zwitterionic structures, carboxylate anions, long polar cation tails, and in some cases, short spacers.

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Preparation of Cellulose Films from Sustainable CO2/DBU/DMSO System

Cited by 26 publications

References 43 publications

Cellulose Nanocomposites of Cellulose Nanofibers and Molecular Coils

Cellulose Nanocomposites of Cellulose Nanofibers and Molecular Coils

Cellulose Membranes from Cellulose CO₂-Based Reversible Ionic Liquid Solutions

Essential Requirements of Biocompatible Cellulose Solvents

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Preparation of Cellulose Films from Sustainable CO2/DBU/DMSO System

Cited by 26 publications

References 43 publications

Cellulose Nanocomposites of Cellulose Nanofibers and Molecular Coils

Cellulose Nanocomposites of Cellulose Nanofibers and Molecular Coils

Cellulose Membranes from Cellulose CO2-Based Reversible Ionic Liquid Solutions

Essential Requirements of Biocompatible Cellulose Solvents

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Product

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Cellulose Membranes from Cellulose CO₂-Based Reversible Ionic Liquid Solutions