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http://dx.doi.org/10.7317/pk.2013.37.3.362

Study on the Changes of Cellulose Molecular Weight and α-Cellulose Content by the Extrusion Conditions of Cellulose-NMMO Hydrate Solution  

Kim, Dong-Bok (Center for Photofunctional Energy Materials, Dept. of Polymer Science and Engineering, Dankook University)
Publication Information
Polymer(Korea) / v.37, no.3, 2013 , pp. 362-372 More about this Journal
Abstract
During extruder processing to manufacture cellulose fiber and film using cellulose-NMMO pre-dope produced by a new method, it seems to occur the changes of molecular weight and ${\alpha}$-cellulose content of cellulose upon thermal and mechanical degradation. In an extruder making cellulose solutions from the pre-dope obtained by high-speed mixer, the changes of cellulose molecular weight and ${\alpha}$-cellulose content resulted with the variations of processing temperature, concentration of cellulose, and residence time. The molecular weight and ${\alpha}$-cellulose content of cellulose decreased with decreasing cellulose concentration and increasing processing temperature. At 15% concentration and short residence time region, the change of ${\alpha}$-cellulose content was so high due to high-shear with an increase in temperature. From these processing conditions, the variations of ${\alpha}$-cellulose content and molecular weight showed different behaviors, and these processing conditions for making cellulose solution were found to be important factors.
Keywords
cellulose; N-methylmorpholine N-oxide (NMMO); fiber & film; molecular weight; ${\alpha}$-cellulose content;
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