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Mathematical modelling of the chitosan fiber formation by wet-spinning

Abstract : Chitosan is a natural polymer obtained by deacetylation of chitin. This polysaccharide is well known for its exceptional biological properties: it is biocompatible and bio absorbable. Chitosan fibers can be used in surgery.The objective of this thesis is to study the physicochemical phenomena involved, to develop a process model, to optimize the filtering process in the laboratory.After a review of the literature in the first chapter, the experimental techniques for obtaining, purifying and characterizing chitosan are described in the second chapter. A study of the structure of the chitosan obtained is presented. This is one of the original results of this work.The principle of the coagulation method in solution, it is essential to determine in what condition it, and what is the determining parameter. Previous studies have shown that this is the diffusion coefficient of soda in the medium. One effect, measurements were made, in different geometries. This study constitutes the work presented in Chapter Three.In chapter four is presented a technique consisting in following by means of a microscope the advance of the coagulation front. This technique makes it possible to determine the diffusion coefficient.The last chapter consisted of developing fibers using a small scale plant existing in laboratory (IMP Lyon 1). The final element of this work consists of modelling the process, calculating the inside and outside diameters of the fibers obtained and comparing the result of the modelling with the experimental results
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Submitted on : Tuesday, September 4, 2018 - 3:40:07 PM
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Alexandru Alin Enache. Mathematical modelling of the chitosan fiber formation by wet-spinning. Chemical engineering. Université de Lyon; Universitatea politehnica (Bucarest), 2018. English. ⟨NNT : 2018LYSE1100⟩. ⟨tel-01867754⟩



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