Cellulose In Copper Ammonia Solution And The Dissolution Of Copper Ethylenediamine Solution And Regeneration

Copper ammonia solution and copper ethylenediamine solution were prepared by different methods. The dissolution of cellulose in these solution was researched. Through the analysis of influence of copper ion concentration,solution temperature and solution time on the solubility of cellulose, the best dissolution process was confirmed.The stability of cellulose ammonia solution and copper ethylenediamine solution were studied. The influence of temperature and air contact time on the degradation degree of cellulose was researched. The function of the adding amount of sodium sulfite to prevent the degradation was also studied. The result shows that the degradation degree of cellulose increases with the rise of temperature and air contact time. The cellulose copper ethylenediamine solution shows higher stability than cellulose copper ammonia solution. When the adding amount of sodium sulfite is 2.5%, the degradation of cellulose can be prevented sufficiently.Rheological properties of cellulose solutions were studied by DV-Ⅱ+Pro revolving viscometer. The viscosity of cellulose solutions rise with the content of cellulose increases, and reduce when the temperature gets higher. Both of the two cellulose solutions, viscosity lower with the shear rate increases. They belong to Newton fluid. There non-newtonian index are close to 1.Cellulose membrane was regenerated by copper ammonia solution. The effect of film conditions to mechanical property of cellulose membrane was studied. The moisture absorption and moisturizing rate of regenerated cellulose membrane reach 36% and 68%. The infrared spectral analysis shows that there is no derivatives generated during the dissolving process. The X-ray diffraction shows that the crystallinity of initial cellulose and regenerated cellulose are 76.4% and 42.2%. The regenerated cellulose membrane shows lower crystallinity. Thermogravimetric analysis shows that the regenerated cellulose has lower initial decomposition temperature and maximum weight loss temperature than initial cellulose. It shows poor thermal stability.