Study on the cellulose acetate process

• Main Authors: Liou-Min-Hong, 劉民鴻
• Other Authors: Wu-Wen-Hai
• Format: Others
• Language: zh-TW
• Published: 2010
• Online Access: http://ndltd.ncl.edu.tw/handle/57606555957430119967

碩士 === 南台科技大學 === 化學工程與材枓工程系 === 98 === In this study, the cellulose was synthesized by esterification and hydrolysis to cellulose acetate, and we investigated that the catalyst、 esterification temperature、 esterification time、 hydrolysis temperature、 and hydrolysis time effected on the Degree of substitution and molecular weight, and we expected to fine the best condition for cellulose acetate process. The results were by chemical titration for the degree of substitution analyzed and by (Nuclear magnetic resonance) and (Fourier transform infrared spectrometer) for the structural analysis and (Gel Permeation Chromatography) for molecular weight analysis. In this work, changing the conditions investigated the influential factor of the Degree of substitution and molecular weight. In this research, the cotton was activated with time period before synthetic cellulose acetate, and the analysis showed that increasing the activated time increased the degree of substitution, but the activation of the cotton has the favorable time for degree of substitution. The catalyst volume effected the degree of substitution increased, but the molecular weight decreased. Increasing the esterification temperature and esterification time effected the degree of substitution and molecular weight decreased, and increasing the hydrolysis time also caused same result. After product is dry by the glacial acetic acid controlled the molecular weight distribution, that didn’t narrow significantly the distribution; however, the action controlled the molecular weight distribution, that improved to narrow the distribution.