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Research on new cellulose solvent system

Author: LiRongChao
Tutor: GuoXianYing
School: Qingdao University
Course: Materials Science
Keywords: composite system cellulose include
CLC: TQ352
Type: Master's thesis
Year: 2011
Downloads: 162
Quote: 0
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Abstract


Cellulose is the most abundant reserves of renewable resources on the world, and the effective use of cellulose to solve the increasingly serious shortage problem is significant, but because the strong hydrogen bonding of the cellulose contain, so it is difficult to dissolve in the general solvent. The current of cellulose solvents we used has certain pollution. So, study new type of cellulose solvents system is great significance.This paper adopts NaOH/urea/thiourea/water solvents system to dissolve cellulose, analysis the system NaOH/urea/thiourea/water to dissolve the content of the influence of cellulose by orthogonal experiment method,obtains the best dissolved ratio. In the circumstances, the optimum proportion by adjusting the freezing temperature and freezing time and stir intensity, studying the influence of cellulose dissolved in the solvent systems.In this paper,we analysis the dissolve of cellulose and explore its dissolution process mechanism, and through the polarizing microscope represent the different period in the system of cellulose state and to observe the degree of dissolved uniform explore the dissolved mechanism; After that we test the cellulose solution through the rheometry rheological, analysis the temperature and concentration influence on the non-newtonian index of the cellulose solution; Further analysis of the solution energy-storage modulus and energy-dissipating modulus and the loss factor, and analyzes the influencing factors to provide the basis for subsequent spinning moulding.This paper using different coagulation bath made regenerated cellulose fiber membrane, the normal structure and morphology, gather strength etc physical and mechanical properties of film were characterized analysis by powerful instrument, scanning infrared spectrometer, scanning electron microscope, X-ray diffraction (XRD) method, and testing membrane uniformity, acid-proof alkaline etc performance. The results showed:Cellulose in NaOH/urea/thiourea/water solvent system is direct dissolve, the derivative Browning reaction did not happen; regeneration membrane has certain alkali, acidoresistant poor.

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CLC: > Industrial Technology > Chemical Industry > Fiber quality of the chemical processing industry > Cellulose chemical processing industry
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