Earticle

초록

영어

Porous, and low-density regenerated cellulose beads (RCBs) have emerged as advanced materials for various engineering applications ranging from chromatography to drug release. Here, 3D porous cellulose beads (CBs) were prepared from the well-dissolved cellulose–TEAOH/urea/H2O solutions via a simple dropping–acid coagulation–freeze drying process. The S-HwBKP with high DP (~1500) were rapidly dissolved at 25 ℃ in a TEAOH/urea solvent system at different molar ratios of TEAOH and urea (T/U = 1:0–1:6), and the dissolved proportion of cellulose was increased from 73.4 to 98.0 wt% with increasing T/U from 1:0 to 1:6. The obtained cellulose–TEAOH/urea solutions with increased T/U molar ratios processed the pronounced surface tension and viscosity, resulting in a bigger size/volume of RCBs via dropping–acid coagulation process. Thereafter, 3D porous RCBs aerogels exhibiting the stable core-shell structure with abundant micro-pores were successfully prepared by freeze-drying method. The slight shrinkage of the freeze-dry RCBs in size and volume was ~11% and ~ 28%, respectively, which was much lower than the oven-dry beads (~64% and ~ 95%). The freeze-dry beads was easily rewet in water and had a good swelling capacity (11.7 g/g). Additionally, its processed lower density (~0.06 g/cm3), high porosity (~91.0%), and thermal/mechanical stabilities, thereby indicating that microporous core-shell structures can be synthesized successfully, and inspiring its widespread design and fabrication on the cellulose-based materials with well-controlled structures via our strategy.

키워드

저자

• Feng Xu [ Department of Paper Science & Engineering, Changgang Institute of Paper Science and Technology, Kangwon National University ]
• Byoung-Uk Cho [ Department of Paper Science & Engineering, Changgang Institute of Paper Science and Technology, Kangwon National University ] Corresponding author

참고문헌

발행기관

간행물

표지보기 관심저널 등록

• 간행물명

  강원대학교 산림과학연구소 학술대회

• 간기

  부정기

• 수록기간

  2017~2024

• 십진분류

  KDC 526 DDC 634