Manufacturing pure cellulose films by recycling ionic liquids as plasticizers

Abstract

Recycling ionic liquids as plasticizers, a green manufacturing method of pure cellulose films which can be used as electronic substrates is successfully demonstrated.

Deconstruction and Reassembly of Renewable Polymers and Biocolloids into Next Generation Structured Materials

“…However, coatings of cellulose model surfaces have helped significantly the understanding of interfacial interactions between cellulosic substrates and other molecules, such as proteins . Recently, dissolution of cellulose toward its conversion into materials has advanced by using ionic liquids that can be recovered and recycled. − The technologies on the subject have advanced significantly leading to several patents, as is the case of the dissolution process based on [emim]­[OAc] and mild temperatures . Cellulosic films were formed from cast cellulose solution, at concentration ranging from 2 to 14 wt %, using [emim]­[OAc] as the solvent.…”

Dissolution of Cellulose in Ionic Liquid–DMSO Mixtures: Roles of DMSO/IL Ratio and the Cation Alkyl Chain Length

“…Ionic liquids (ILs) have been widely recognized as promising “green solvents” to replace traditional biopolymer solvents due to their excellent dissolving abilities and desirable properties such as negligible vapor pressure, low toxicity, high thermal and chemical stability, nonflammability, structural designability, and recyclability. ,− ILs are salts made up of an organic cation and an organic or inorganic anion and have a melting point below 100 °C . The dissolution of cellulose in ILs is mainly determined by the IL cation and anion structures (e.g., ion type, the length and symmetry of substituent groups). , The length of the side alkyl chain, as well as the symmetry of ILs, are also investigated in a number of other scientific areas. − Over the past few years, ILs have been increasingly demonstrated to serve as excellent media for cellulose dissolution, , which also allows for the chemical modification of cellulose with high degrees of substitution (DS), , the pretreatment of biomass for the subsequent enzymatic conversion into sugars or ethanol, and the development of various cellulose-based materials such as cellulose films, solid polymer electrolytes, and drug carriers . Nonetheless, the strong association between cations and anions makes ILs a highly viscous medium, leading to slow and high dissolution temperatures for cellulose in ILs. ,, …”

Chemistry and Nanotechnology‐Oriented Strategies toward Nanocellulose for Human Water Treatment

“…Biomass based substrates for the creation of nanocellulose materials are considered as a precious commodity, which provide abundant resources for biofuels and chemicals (Figure 2). [44][45][46][47][48][49] Using the above mentioned technologies, nanocelluloses were prepared from numerous cellulosic sources, including soft and hard woods, corn, sugar beet pulp, miscanthus, banana, sisal, opuntia, ficus-indica (cactus), flax, potato, bagasse, wheat straw, bamboo, Luffa cylindrica, grape pomace, as well as some seaweed. [50][51][52] The morphological characteristics of the produced cellulose derived adsorbents mainly depend on the morphological characteristics of the original fibers.…”