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REFERENCE LINKING PLATFORM OF KOREA S&T JOURNALS
> Journal Vol & Issue
Journal of the Korean Wood Science and Technology
Journal Basic Information
Journal DOI :
The Korean Society of Wood Science Technology
Editor in Chief :
Volume & Issues
Volume 40, Issue 6 - Nov 2012
Volume 40, Issue 5 - Sep 2012
Volume 40, Issue 4 - Jul 2012
Volume 40, Issue 3 - May 2012
Volume 40, Issue 2 - Mar 2012
Volume 40, Issue 1 - Jan 2012
Selecting the target year
Bioethanol Production from Popping Pretreated Switchgrass
Kim, Hyun-Joo ; Bae, Hyeun-Jong ;
Journal of the Korean Wood Science and Technology, volume 40, issue 3, 2012, Pages 147~155
DOI : 10.5658/WOOD.2012.40.3.147
Switchgrass was selected as a promising biomass resource for bioethanol production through popping pretreatment, enzymatic saccharification and fermentation using commercial cellulase and xylanase, and fermenting yeast. The reducing sugar yields of popping pretreated switchgrass after enzymatic saccharification were above 95% and the glucose in thesaccharificaiton solution to ethanol conversion rate after fermentation with
was reached to 89.6%. Chemical compositions after popping pretreatment developed in our laboratory were 40.8% glucose and 20.3% xylose, with much of glucose remaining and only xylose decreased to 4.75%. This means that the hemicelluloses area broke off during popping pretreatment. FE-SEMexamination of substrate particles after popping pretreatment was showed fiber separation, and tearing and presence of numerous micro pores. These changes help explain, enhanced enzymatic penetration resulting in improved hydrolysis of switchgrass particles after popping pretreatment.
Preparation of Cellulose Nanofibers from Domestic Plantation Resources
Jang, Jae-Hyuk ; Kwon, Gu-Joong ; Kim, Jong-Ho ; Kwon, Sung-Min ; Yoon, Seung-Lak ; Kim, Nam-Hun ;
Journal of the Korean Wood Science and Technology, volume 40, issue 3, 2012, Pages 156~163
DOI : 10.5658/WOOD.2012.40.3.156
This research has been carried out to investigate the characteristics of cellulose nanofibers manufactured from domestic lignocellulosic materials by mechanical grinding method. The continuous grinding process was effective for loosening cell wall structure, with increasing grinding time, much smaller nanofibers were observed. Filtration time was linearly increased with increasing grinding time for all experimental materials. Relative crystallinity of cellulose was not changed by grinding process, but increased by delignification treatment. Tensile property of fiber sheets was drastically improved with increasing grinding time. Fibers sheets obtained from delignified cone stalks showed an excellent tensile strength. Consequently, it is considered that this study presented some effective information for manufacturing cellulose nanofibers with domestic plantation resources.
Properties of Plywood Bonded with Adhesive Resins Formulated with Enzymatically-Hydrolyzed Rapeseed Flour
Yang, In ; Han, Gyu-Seong ; Choi, In-Gyu ; Kim, Yong-Hyun ; Ahn, Sye-Hee ; Oh, Sei-Chang ;
Journal of the Korean Wood Science and Technology, volume 40, issue 3, 2012, Pages 164~176
DOI : 10.5658/WOOD.2012.40.3.164
In the present study, rapeseed flour (RSF), which is a by-product from the production of edible oil and biodiesel extracted from rapeseed, was used to develop alternative adhesives for the production of plywood panels. To examine the effects of the enzyme on the adhesive properties and formaldehyde emission of the RSF-based adhesive resins, three enzymes, such as cellulase (CEL), pectinase (PEC) and protease (ALC), were used either separately or together. As a crosslinking agent, PF prepolymers, which were prepared with 1.5, 1.8 and 2.1 mole formaldehyde and 1 mol phenol (1.8-, 2.1- and 2.4-PF), were added into the RSF hydrolyzates. The adhesive resins formulated with CEL- or CEL-PEC-RSF hydrolyzates and 1.8-F/P PF prepolymers exhibited excellent adhesive strengths and formaldehyde emission. The tensile shear strength and formaldehyde emission of the plywood panels bonded with the formulate resins were satisfied with the minimum requirement of the KS standard for ordinary plywood panels (0.6 N/
). In addition, formaldehyde emissions of the plywood panels approached to that of E0 specified in the KS standard (0.5 mg/
), and even had much better than those of commercial UF glue mixes. Overall, the use of RSF-based adhesive resins for the production of plywood panels might provide durable adhesive properties and an environmentally friendly substitute for petroleum-based adhesive resins. However, further researches - the increase of solid content of RSF-based adhesives for reducing press time and the microscopic observation of plywood specimen for identifying the relationship between tensile shear strength and the penetration of adhesives into wood structure - are required to commercialize the RSF-based adhesives.
Development of Adhesive Resins Formulated with Rapeseed Flour Hydrolyzates for Medium Density Fiberboard (MDF)
Yang, In ; Han, Gyu-Seong ; Choi, In-Gyu ; Kim, Yong-Hyun ; Ahn, Sye-Hee ; Oh, Sei-Chang ;
Journal of the Korean Wood Science and Technology, volume 40, issue 3, 2012, Pages 177~185
DOI : 10.5658/WOOD.2012.40.3.177
The interest to develop adhesives from renewable resources is growing to substitute petroleum-based adhesive resins in the manufacture of wood based panels. In our study, rapeseed flour (RSF), which is the by-product of bio-diesel produced from rapeseed, were hydrolyzed with acid and alkali. As a crosslinking agents of the RSF hydrolyzates, phenol-formaldehyde prepolymers (PF) were prepared. The RSF hydrolyzates and PF were mixed to complete the formulation of RSF-based adhesive resins, and the resins were applied to make the medium density fiberboard (MDF). The physical and mechanical properties of the MDF were measured to examine whether RSF can be used as raw materials of adhesive resins for the manufacture of MDF or not. The average moisture content and density of the MDF made with RSF-based adhesive resins satisfied the minimum requirement of KS standard, but the thickness swelling was not. The bending strengths of the MDF made with RSF-based adhesive resins were lower than that of the MDF made with commercial UF resins, but the internal bonding strengths of tested MDF in some make-up conditions of RSF-based adhesive resins were higher than that of MDF made with commercial UF resins. These results showed the potential of RSF as a raw material of adhesives for the production of MDF. Future works on the optimal manufacturing process conditions of MDF made with RSF-based adhesive resins are required to improve the performance of MDF made with RSF-based resins.
Shear Performance of Wood-Concrete Composite I - Shear Performance with Different Anchorage Length of Steel Rebar in Wood -
Lee, Sang-Joon ; Eom, Chang-Deuk ; Kim, Kwang-Mo ;
Journal of the Korean Wood Science and Technology, volume 40, issue 3, 2012, Pages 186~193
DOI : 10.5658/WOOD.2012.40.3.186
The wood-concrete composite can be effectively applied for bridge superstructure, and the concept of fully composite action between each member is one of the most important consideration. Until now, related researches have been done mainly in North America and EU countries not enough to cover the fundamental studies. Therefore, this study is planned to perform one of the important issue for using the wood-concrete composite. The objective of this study is evaluation of shear performance with different anchorage length of steel rebar in wood. Prediction of the yield mode and the reference design value was firstly performed as the preliminary investigation. Then, initial stiffness, yield load and maximum load were derived from the shear test due to different anchorage length of the steel rebar (SD30A in Korean Standard) in wood. It was found out from this study that initial stiffness and yield load are not related with the anchorage length over 20 mm of anchorage length while maximum load shows increasing tendency till 60 mm of anchorage length. Pullout strength of inserted steel rebar in wood is considered to be one reason and this was also verified with the x-ray radiography.
Chemical·Structural characterization of lignin extracted from Pitch Pine with Ionic Liquid (1-ethyl-3-methylimidazolium acetate)Pine with Ionic Liquid (1-ethyl-3-methylimidazolium acetate)
Kim, Jae-Young ; Kim, Tae-Seung ; Hwang, Hye-Won ; Oh, Shin-Young ; Choi, Joon-Weon ;
Journal of the Korean Wood Science and Technology, volume 40, issue 3, 2012, Pages 194~203
DOI : 10.5658/WOOD.2012.40.3.194
1-Ethyl-3-methylimidazolium acetate known as efficient biomass pretreatment reagent was used for the extraction of lignin from rigida pine wood (pitch pine), which was called to ionic liquid lignin (ILL), and chemical structural features of ILL were compared with the corresponding milled wood lignin (MWL). The amounts of phenolic hydroxyl groups (Phe-OH) was determined to 10.0% for ILL and 7.2% for MWL, respectively, where those of methoxyl groups (OMe) were 4.9% for ILL and 11.0% for MWL, respectively. The weight average molecular weight (Mw) of ILL (3,995) were determined to ca. 1/2 of that of MWL (8,438) and polydispersity index (PDI: Mw/Mn) suggested that the lignin fragments were more uniform in the ILL (PDI 1.36) than in the MWL (PDI 2.64). The temperature (Tm) corresponding to maximum decomposition rate (Vm) of ILL (
) was ca.
lower than that of MWL (
), suggesting that ILL was thermally unstable than MWL, as evidence from the lower Tm for ILL. Moreover, the structural characteristics of ILL and MWL were confirmed by spectroscopic analyses (FT-IR and
-NMR), and these results indicated ionic liquid (1-ethyl-3-methylimidazolium acetate) was chemically or physically bound to ILL.
Investigation of Physicochemical Properties of Bio-oils Produced from Pitch Pine (Pinus rigida) at Various Temperatures
Kim, Tae-Seung ; Kim, Jae-Young ; Oh, Shin-Young ; Hwang, Hye-Won ; Choi, Joon-Weon ;
Journal of the Korean Wood Science and Technology, volume 40, issue 3, 2012, Pages 204~211
DOI : 10.5658/WOOD.2012.40.3.204
In this study, fast pyrolysis of pitch pine (Pinus rigida) was performed in a fluidized bed reactor under the temperature ranges between 400 and
at the residence time of 1.9 sec. Essential pyrolytic products (bio-oil, biochar, and gas) were produced and their yield was clearly influenced by temperature. The maximum yield of bio-oil was observed to 64.9 wt% (wet basis) at the temperature of
. As pyrolysis temperature increased, the yield of biochar decreased from 36.8 to 11.1 wt%, while gas amount continuously increased from 16.1 to 33.0 wt%. Water content as well as heating value of bio-oils were obviously sensitive to the pyrolysis temperature. The water contents in the bio-oil clearly decreased from 26.1 (
) to 11.9 wt% (
), with increasing the fast pyrolysis temperature, while their higher heating values were increased from 16.6 MJ/kg to 19.3 MJ/kg. According to GC/MS analysis, 22 degradation compounds were identified from the bio-oils and 10 compounds were derived from carbohydrate, 12 compounds were derived from lignin.
Current Research Trends in Wood Preservative for Enhanced Durability : A Literature Review on Copper Based Preservatives
Kim, Yeong-Suk ;
Journal of the Korean Wood Science and Technology, volume 40, issue 3, 2012, Pages 212~227
DOI : 10.5658/WOOD.2012.40.3.212
Current research trends in wood preservatives for enhancing durability was reviewed. Due to leaching of recent Copper-Based Preservatives commonly used as chemicals for pressure treatment; they have been a growing concern, especially in improving the fixation of the copper as alkyl ammonium quat. and azol in wood and preventing the leaching of active ingredients. With the appearance of emulsion type chemicals using micronized and nano-sized wood preservatives, researchs on characteristics of Copper-Based Preservatives regarding penetration and fixation in wood are debatable. Moreover, unlike the case of CCA, the recent alkyl ammonium quat. and azol bear a serious threat in the decrease of antimicrobial effectiveness against wood destroying fungi with copper tolerance. Therefore, development and research of co-biocide is needed.