The Preparation Of High-Performanc Regeneration Cellulose Membrane And It’s Composite Material

This paper is mainly focused on the preparation of highly-functional regenerated cellulose films and cellulose/CMC composite hydrogel optimized with GO in NaOH /urea aqueous solution invented by Professor Lina Zhang. The work mentioned in this paper can be divided into three parts.The first part is aimed at exploring the influence of the coagulating bath on the structure and properties of the regenerated cellulose films. Our job is to prepare the 5wt%H2SO4/10wt%NaOH aqueous solution with different temperature and to characterized the mechanical and optical properties of the fabricated films by DMA,UV-vis etc.. Moreover, the microstructure of the regenerated films, the changes in the crystal structure as well as the degree of crystallinity are also observed by SEM and XRD. Results suggested that the average diameter of the pores of the cellulose films regenerated in lower temperature coagulating bathes ranged from 0.2um to 0.3um. However,when the temperature reached a higher level (30～40℃), the pore size would be more than 0.4um. With an increase of temperature, the transmittance of visible light and mechanical properties were deteriorating. Furthermore, regenerated cellulose films with optimal optical as well as mechanical properties could be prepared in a 15℃ coagulating environment.The second part is centered on the affection of the centrifugal force to regenerated cellulose films. Our attention is mainly focused on the undissolved wiskers in the cellulose solution which maybe have self-enhanced function to regenerated films. The concentration and the length of those undissolved whiskers are observed by POM; the mechanical and optical properties of the self-enhanced regenerated films are tested by the Universal tensile machine and UV-vis. We discovered that the cellulose solution which was subjected to centrifugation at a lower speed, contained a great number of undissolved whiskers, impurities and bubbles in large size. Interestingly, the number and the size of remained whiskers were dwindling while increasing the speed of centrifugation. The presence of whiskers, impunities and bubbles had a detrimental effect on films’mechanical properties.The aim of the last part is to prepare cellulose/CMC composite hydrogel optimized with GO. Our target is to improve the mechanical strength and stability of cellulose/CMC hydrogel by optimizing it with GO. The micropore architecture is observed by SEM; the degree of reduction of GO in the fabricated hydrogel is revealed by UV-vis; the thermal stability is characterized by TGA. We added GO successfully to the cellulose/CMC composite hydrogel. Consequently, in addition to uninfluenced superabsorbent characteristic, the optimized hydrogel possessed excellent strong and stiff mechanical properties.