The use of green solvents in the electrospinning of polymers

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F70883521%3A28610%2F24%3A63586098" target="_blank" >RIV/70883521:28610/24:63586098 - isvavai.cz</a>

Result on the web

<a href="http://hdl.handle.net/10563/54638" target="_blank" >http://hdl.handle.net/10563/54638</a>

DOI - Digital Object Identifier

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Result language

angličtina

Original language name

The use of green solvents in the electrospinning of polymers

Original language description

Electrospinning is a technology suitable for the preparation of anofibrous structures with a wide range of applications in many industrial sectors, as well as in areas such as water treatment, pharmaceutics or medicine. A wide range of polymers can be processed into nanofibrous materials using solution electrospinning. Polymer solutions are often prepared using toxic solvents hazardous to the environment and human health. Such solvents include chloroform, N,N-dimethylformamide (DMF), N,N-dimethylacetamide (DMAc), dichloromethane (DCM), tetrahydrofuran (THF), hexafluoro-2-propanol (HFIP), N-methyl-2-pyrrolidone (NMP), etc. The European REACH Regulation has identified them as Substances of Very High Concern (SVHC). In the last decade, efforts to replace toxic solvents with green alternatives have been on the rise, including in the field of electrospinning.The “greenness” of solvents, i.e. their environmental acceptability and safety for human health, is most often assessed using the 12 principles of green chemistry. On the basis of these principles, a number of solvents have been proposed that should be suitable substitutes for the aforementioned for dissolving a wide range of polymers.The fact that a polymer solution can be prepared in a green solvent is no guarantee of electrospinability. The additives that are added to the electrospinning solutions to modify their electrospinnability, in particular their electrical conductivity, must also be soluble in the chosen solvent or multisolvent system. The evaporation rate of the solvent must also be considered. A number of solvents for the preparation of polymer solutions processable on polymer membranes by phase separation are known from the literature, e.g. Cyrene (dihydrolevoglucosenone), γ-valerolactone (GVL), Rhodiasolv Polarclean (methyl 5-(dimethylamino)-2-methyl-5-oxopentanoate) or N butylpyrrolidinone (NBP). However, their evaporation rate is so high that they cannot be evaporated during the spinning process, or their residues remain in the fibres, which may exclude them from some applications such as medicine, pharmaceuticals or the beverage industry. The recyclability of waste solvents is also an important issue, especially when considering the commercial application of electrospinning technology.In order to make electrospinning a more attractive commercial technology, solvents that are economically affordable and comply with social and legal regulations, especially in terms of environmental and human health impacts, need to be used. At the same time, they must meet the condition of sufficient evaporation rate and solubility of the necessary additives.

Czech name

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Czech description

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Type

O - Miscellaneous

CEP classification

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OECD FORD branch

10404 - Polymer science

Project

<a href="/en/project/FW06010527" target="_blank" >FW06010527: A new generation of nanostructured pleated filters for collective and personal protection of the population</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2024

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů