Arrangement of Cellulose on the surface and Properties of Regenerated Cellulose Films

• Main Authors: Tsung-Jen Yang, 楊宗仁
• Other Authors: Chun-Hank Ke
• Format: Others
• Language: en_US
• Published: 2015
• Online Access: http://ndltd.ncl.edu.tw/handle/6jffr8

碩士 === 國立臺灣大學 === 森林環境暨資源學研究所 === 106 === This research depends on using N-methylmorpholine-N-oxide (NMMO) solution as solvent toward commercial dissolved pulps to produce regenerated cellulose films, whereas sodium hydroxide (NaOH) and hydrogen peroxide (H2O2) is used as the pretreatment of solution. The purpose is to make the fiber bundles neatly and homogeneously aligned in the same direction on the surface of films. We can observe the arrangement of fiber bundles or liquid crystals simply by adding the 4-Cyano-4''-pentylbiphenyl (5CB) in the surface under the polarizing optical microscope (POM) and verify the results by using the scanning electron microscope (SEM). In this case, it is a simple operation by POM which can replace the complex and time-consuming SEM. The results indicate that the orientation of fiber bundles on the surface of regenerated cellulose film is obvious by increasing the rotational speed or decreasing the concentration of pulps. However, the viscosity and degree of polymerization (DP) are also important factors. The DP value will be reduced after pretreatment of the sodium hydroxide (NaOH) or hydrogen peroxide (H2O2) with different time resulting in the evident arrangement of fiber bundles. The arrangement of fiber bundles is indeed the same as the spinning tangential direction. As a result, this regenerated cellulose film can be applied in many different fields.