Electrospinning polymer fibers. Since the dawn of mankind, the textile industry has undergone greater and more important changes than other industries, changes that have occurred in terms of both raw materials and production methods.
Because despite the rapid increase in world population, the production of fibers, i.e. textile raw materials from natural sources, is not increasing significantly and the production of natural textile raw materials is very limited, especially in Europe. the countries.
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assembly of oriented ultrafine polymer fibers by centrifugal electrospinning
In this regard, the production of synthetic fibers has increased significantly compared to fibers derived from natural sources, it is inevitable that this increase is due to the continuous and continuous increase in the world population. When polymers, the main components of fibers, are obtained from natural sources in the form of polymer compounds or through the synthesis of chemical substances, we speak of synthetic fibers. Basically, based on the classification of textile fibers, there are two categories namely natural fiber group and man-made fiber group. In these groups, fibers are divided into 3 groups based on source.
electrospinning of continuous aligned polymer fibers
If the polymers, which make up the main material of fibers, are obtained as polymer compounds from natural sources and converted into fibers by special physical and chemical processes, we speak of regenerated fibers.
If the polymer, which is the starting material for the fibres, is obtained through the synthesis of certain chemicals, we speak of synthetic fibres. There are also fibers whose structure is obtained by human hands from mineral materials called artificial ANORGANIC fibers obtained from glass and metal fibers.
electrospinning of polyurethane fibers polymer
In this process, a polymer solution is prepared in a suitable solvent. این محلول در یک حمام انعقادی تحت فشار ثابت با استفاده از پمپ به سر نازل فرستاده می شود.دلیل اینکه به آن حمام انعقادی با سر نازل می گویند این است که پلیمر در این حمام منعقد می شود.از آنجایی که محلول پلیمری به شکل خارج this works out. The filaments coagulate through the thin holes and thereby collapse. The structure of the coagulation bath is prepared in such a way that the polymer solidifies from the solution state, eg the basic solution of an insoluble polymer. A substance that dissolves in alkaline solutions and does not dissolve in acids is selected as the coagulation bath, and the acidic solution in which the polymer is not dissolved is selected.
Electrospinning polymer fibers
(polymer solution in suitable solvent) This solution is fed to the forming head (nozzle, nozzle) in the coagulation bath with a pump under constant pressure. Spinning heads are those that have one or more holes in the diameter of the thread to be formed, i.e. in the coagulation bath.
polymer fibers by electrospinning
The polymer solution emerging as a thread from the small holes in the forming head coagulates in the bath and coagulates and thus precipitates. The structure of the precipitation bath is prepared in such a way that the polymer solidifies in the solution. The structure of the coagulation bath is made so that it solidifies the polymer from the solution state, for example, a basic solution is made from an insoluble polymer material that is soluble in alkaline solutions and insoluble in acids. The solution in which the polymer is not dissolved is selected as the coagulation bath.
As the polymer solution comes out of the tiny holes in the form of threads, it solidifies and falls out. This is usually a flanged spool around which the threads pass to set the speed and tension in the manufacture of synthetic fibers.
A slight tension is applied to the polymer solution, which is in the form of a string. In order to prepare a polymer solution by this method, the solvent must be a volatile substance with a low boiling point. spinning process) is mostly used for acetate fibers. It is also used to obtain certain polyacrylonitrile fibers.