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MicroFibrillated Cellulose (MFC) 제조를 위한 전처리 팽윤제의 종류와 농도에 따른 펄프의 고해 특성
안은별(Eun-Byeol Ahn),정진동(Jin-Dong Jung),정수은(Soo-Eune Jung),김강재(Kang-Jae Kim),엄태진(Tae-Jin Eom) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.3
In this study, we evaluated properties of pulp treated with swelling agent and swelling concentration. We used swelling agent, such as NaOH, DMSO, urea. One of them, pulps treated with NaOH from 0 to 5% measured WRV, beating efficiency, crystallinity and aspect ratio. We identified that NaOH when freeness reaches 100mL CSF was the shortest, on the other hand, WRV didn’t change. Because NaOH is good beating efficiency, when pulp treated with various concentration of NaOH from 0 to 5%, pulp treated 1% NaOH was best beating efficiency. However, WRV, crystalline structure and crystallinity didn’t change. The more NaOH concentration increased, the more aspect ratio increased, but when NaOH concentration exceeds 3%, aspect ratio decreased. As a result, pulp treated with 1% NaOH was the greatest beating efficiency and WRV, chemical structure didn’t change.
김강재(Kang-Jae Kim),정진동(Jin-Dong Jung),안은별(Eun-Byeol Ahn),엄태진(Tae-Jin Eom) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.4
Agricultural cultivation papers treated with water repellent were investigated in order to analyse mechanical properties and durability. The water repellency was optimal when papers are treated with Wb and Sa water repellents. Also, WCPs with 5% water repellent were more effective than those of 3 and 10%. In addition, water repellency of WCPs with Wb and Sa water repellents were kept constant in correlation with aging time. Finally, WCP with Wb water repellent possesses efficiency in terms of mechanical properties and durability.
MicroFibrillated Cellulose(MFC) 제조를 위한 전처리 효소의 활성 및 고해 특성
김강재(Kang-Jae Kim),정진동(Jin-Dong Jung),정수은(Soo-Eune Jung),안은별(Eun-Byeoul Ahn),엄태진(Tae-Jin Eom) 한국펄프·종이공학회 2015 펄프.종이기술 Vol.47 No.1
In this study, we evaluated optimum condition of enzyme with pH and temperature for preparation of microfibillated cellulose(MFC). Well-known endo-glucanase, three enzymes were used and CMC was used for substrate. Enzyme activity was evaluated using DNS method and absorbance with UV/VIS spectrophotometer. The enzyme shown the greatest activity was reacted with pulps at optimum condition for 1 hour and treated pulps beated until 100 mL CSF. Enzyme B and Enzyme L was the higher enzyme activity below 0.1% concentration and Enzyme N was the lowest enzyme activity. At various pH and temperature conditions, enzyme activity of Enzyme B was higher than the others at the same concentration. Especially enzyme activity at 50℃ of Enzyme B was almost not changed over pH 6.0. Optimum condition of three enzyme was pH 6 or pH 7 and 50℃or 60℃. Also beating efficiency of enzyme treated pulps with Enzyme B is 55.6%.