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김강재 ( Kang-jae Kim ),나기백 ( Gi-baek Nah ),류지애 ( Ji-ae Ryu ),엄태진 ( Tae-jin Eom ) 한국목재공학회 2018 목재공학 Vol.46 No.3
ISPM No. 15에 의거한 열처리 목재의 검증을 위한 연구로서 열처리 목재 표면의 분광학적 특성을 분석하였다. IR 스펙트럼 상에서는 다양한 작용기들이 확인되지만 수종간, 열처리 시간 및 보관 기간에 따른 특별한 차이를 발견하기 어려웠다. HBI(hydrogen-bonding intensity)는 보관 기간에 따른 열처리 목재의 변화는 관찰할 수 있지만 열처리 시간에 따른 변화는 관찰하기 어려웠다. 하지만 PCA score plot 상에서 수종 내에서 60분 혹은 90분의 열처리 시간에 따라 목재의 분류가 가능하였다. PCA에서 열처리 목재의 분류의 기준은 목재 내 리그닌의 방향족 환과 셀룰로오스의 C-H bending이었으며 이들 성분에 의해 ISPM No. 15로 열처리된 목재를 분류할 수 있었다. As a study for the verification of heat treated wood according to ISPM No. 15, the spectroscopic characteristics of the heat treated wood surface were analyzed. Various functional groups were observed on the IR spectrum, but it was difficult to find any particular difference between wood species, heat treatment time and storage period. HBI (hydrogen-bonding intensity) shows the change of the heat treated wood according to the storage time, but the change of wood with the heat treatment time was hard to be observed. On the PCA score plot, however, it was possible to sort the wood according to the heat treatment time of 60 minutes or 90 minutes in the species. The standards for classification of heat-treated wood in PCA were aromatic rings in lignin and C-H bending in cellulose, and these components were able to classify heat-treated wood by ISPM No. 15.
Glycol Ether를 이용한 국내산 참나무류의 LAS 펄프화
김강재(Kang-Jae Kim),나기백(Gi-Baek Nah),류지애(Ji-Ae Ryu),엄태진(Tae-Jin Eom) 한국펄프·종이공학회 2018 펄프.종이技術 Vol.50 No.2
The pulp from Korean mixed oaks were prepared by LAS (Low temperature, Atmospheric pressure, and Short reaction time) pulping method with different temperature and reaction. The pulp prepared under low cooking temperature had a high residual lignin content spite of increasing cooking time. However, as the cooking temperature increased, the lignin in the wood was easily removed and the yield of pulp increased and the residual lignin content decreased. The peak intensities derived from hemicellulose and lignin, which have been confirmed from wood chips, are gradually weaker in response to pulping. Peak regions representing cellulose were strongly confirmed from IR data of pulp prepared at more than 110℃. It can be concluded that pulping of Korean mixed oak was suitable for 60 minutes at 110℃. It was predicted that the possibility of using the LAS pulp as a raw material for papermaking was high because the LAS pulp showed the same fiber characteristics as KP. LAS pulp showed higher glucose content than wood chip, many hemicellulose was eluted by acid catalyst and showed low xylose content. The reason why the syringaldehyde ratio of LAS pulp decreased compared to wood chips was that a large amount of lignin was condensed by cooking reaction.
화학적 미분화에 의한 리그닌이 풍부한 마이크로셀룰로오스 미세분의 제조 및 수초 특성
김강재(Kang-Jae Kim),나기백(Gi-Baek Nah),류지애(Ji-Ae Ryu),엄태진(Tae-Jin Eom) 한국펄프·종이공학회 2017 펄프.종이技術 Vol.49 No.3
In this study, chemical micronization method was used to produce (lignin rich microcellulose fines (LMCFs) of 10% lignin contents. The handsheets of containing 5% LMCFs were prepared and analyzed their physical characteristics. The morphology of LMCFs were changed according to the grinder (Super Masscollider) passing number. After passing 10 times through the grinder, the shape of LMCFs became similar to those of secondary fines. The drainage time of LMCFs was much shorter than that of MFCs. The tensile index gradually increased with the grinding passing number of LMCFs. The tensile index of the handsheet containing LMCFs of 10 passing number was 38.8 N·m/g, that was 33% improvement from the handsheet without LMCFs. The brightness of the handsheet containing LMCFs was improved in proportional to the grinder passing number.