Polymer(Korea) (폴리머)

The Polymer Society of Korea (한국고분자학회)
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Study on the Changes of Cellulose Molecular Weight and α-Cellulose Content by the Extrusion Conditions of Cellulose-NMMO Hydrate Solution

셀룰로오스-NMMO 수화물 용액의 압출가공 조건에 따른 셀룰로오스 분자량과 알파 셀룰로오스 함량 변화에 대한 연구

  • Kim, Dong-Bok (Center for Photofunctional Energy Materials, Dept. of Polymer Science and Engineering, Dankook University)
  • 김동복 (단국대학교 광에너지소재연구센터, 고분자시스템공학과)
  • Received : 2012.12.05
  • Accepted : 2013.01.30
  • Published : 2013.05.25
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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.

새로운 방법에 의하여 제조된 셀룰로오스-NMMO pre-dope를 이용한 셀룰로오스 섬유 및 필름 제조를 위한 압출가공 시 열분해 및 기계적 분해에 따른 셀룰로오스의 분자량 및 알파 셀룰로오스 함량 변화에 대하여 고찰하였다. 고속분쇄에 의해 제조된 pre-dope를 압출기에 통과시켜 용액으로 제조할 때 가공온도, 셀룰로오스의 농도 및 체제시간에 따라 셀룰로오스의 분자량 및 알파 셀룰로오스 함량 변화가 다양하게 나타났다. 셀룰로오스의 분자량과 알파 셀룰로오스 함량은 셀룰로오스의 농도가 낮을수록 온도가 높을수록 감소하였다. 셀룰로오스 농도 15% 및 짧은 체제시간 영역에서 알파 셀룰로오스 함량은 높은 전단으로 인해 온도가 높을수록 가장 큰 변화를 보였다. 다양한 가공조건으로부터 알파 셀룰로오스 함량변화 거동은 분자량 변화와 다른 거동을 보였으며 셀룰로오스 용액 제조를 위한 압출가공조건이 중요 요인임을 알 수 있었다.

Keywords

Acknowledgement

Supported by : 경기도지역협력연구센터(CRRC)

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