Journal of the Korean wood science and technology最新文献_第9页

Use of Pine (Pinus densiflora) Pollen Cones as an Environmentally Friendly Sound-Absorbing Material 利用松(Pinus densiflora)花粉球果作为环保吸声材料

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.3.186

E. Jang

引用次数: 6

Antioxidant Activities of Essential Oils from Citrus × natsudaidai (Yu. Tanaka) Hayata Peels at Different Ripening Stage 柑桔挥发油的抗氧化活性研究田中)早田不同成熟阶段的果皮

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.4.272

Jiyoon Yang, Won-sil Choi, Su-Yeon Lee, Minju Kim, M. Park

{"title":"Antioxidant Activities of Essential Oils from Citrus\u0000 × natsudaidai (Yu. Tanaka) Hayata Peels at Different\u0000 Ripening Stage","authors":"Jiyoon Yang, Won-sil Choi, Su-Yeon Lee, Minju Kim, M. Park","doi":"10.5658/wood.2022.50.4.272","DOIUrl":"https://doi.org/10.5658/wood.2022.50.4.272","url":null,"abstract":"The essential oil extracted from Citrus × natsudaidai (Yu. Tanaka) Hayata peels is known to have various biological properties. However, the chemical composition of essential oil is influenced by the ripening stages of fruits, which then affects related biological activities. This study investigates the antioxidant activities of essential oils extracted from Citrus × natsudaidai peels at different ripening stages (immature, mature, and overripe). The essential oils were extracted using the hydro-distillation method. As a result of gas chromatography-mass spectrometry (GC-MS) analysis, d-limonene was dominant and was increased as matured. However, γ-terpinene was decreased. The antioxidant properties and their total phenolic content (TPC) were influenced by the ripening stages. The TPC was highest in the immature stage of essential oil (1,011.25 ± 57.15 mg GAE/100 g). 2,2‐Diphenyl‐1‐picrylhydrazyl (DPPH) radical scavenging activity was excellent in the immature stage (EC 50 = 15.91 ± 0.38 mg/mL). 2,2’-Azino-bis(3-ethylbenzothiazoline-6-sulfonic acid) (ABTS) radical scavenging activity was superior in overripe stage (EC 50 = 20.43 ± 0.37 mg/mL). The antioxidant activity measured using ferric reducing antioxidant power (FRAP) assay showed higher values for the essential oils in immaturity (1,342.37 ± 71.07 mg Fe 2+ /100 g). Comprehensively, the essential oil in the immature stage showed the best antioxidant activity. Finally, knowing the chemical composition and antioxidant activity at different ripening stages will provide data for selecting the right fruit.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44969480","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Preparation and Characterization of Hydrophobic Coatings from Carnauba Wax/Lignin Blends 巴西棕榈蜡/木质素共混物疏水涂料的制备与表征

Journal of the Korean wood science and technology Pub Date : 2022-05-01 DOI: 10.5658/wood.2022.50.3.149

Jun-Sun Bang, Jungkyu Kim, Y. Kim, J. Oh, H. Yeo, H. Kwak

{"title":"Preparation and Characterization of Hydrophobic Coatings from Carnauba Wax/Lignin Blends","authors":"Jun-Sun Bang, Jungkyu Kim, Y. Kim, J. Oh, H. Yeo, H. Kwak","doi":"10.5658/wood.2022.50.3.149","DOIUrl":"https://doi.org/10.5658/wood.2022.50.3.149","url":null,"abstract":"To realize the infinite possibilities of materials derived from wood, it is necessary to overcome the weak moisture stability of wood. Thus, the development of an eco-friendly hydrophobic coating agent is essential, and of these, woody biomass-based materials are strongly attractive as coatings. In this study, eco-friendly hydrophobic wood coatings were prepared using carnauba wax purified from palm leaves and sprouts, and kraft lignin. The physicochemical properties of the carnauba wax/lignin blends according to the ratio of carnauba wax and lignin were observed by morphology and functional group change. In addition, the coating performance of carnauba wax/lignin blend coatings was confirmed by measuring the contact angle change. It was found that the addition of lignin could accelerate the atomization of wax particles, and that micro-roughness can be realized when applied to the actual wood surface, to ensure that the coating effect over time lasts longer. In addition, it was confirmed that the addition of lignin increases the hydrogen-bond-based interaction with the wood of the coating, thereby providing better coating stability and increasing the durability of the coating solvent under friction. The carnauba wax/lignin paint developed in this way is eco-friendly because all components are made of wood-based raw materials and have an excellent affinity with wood surfaces. Therefore, it is expected to be applicable to the coating process of wood-plastic composites and timber composites.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-05-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47369203","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Formaldehyde Deodorization Effect and Far-Infrared Emission Characteristics of Ceramics Prepared with Sawdust, Risk Husk, and Charcoal: Effect of Material Mixing Ratio 木屑、木屑和木炭制备陶瓷的甲醛除臭效果和远红外发射特性：材料配比的影响

Journal of the Korean wood science and technology Pub Date : 2022-03-01 DOI: 10.5658/wood.2022.50.2.104

Jung-Woo Hwang, Seung-Won Oh

{"title":"Formaldehyde Deodorization Effect and Far-Infrared Emission Characteristics of Ceramics Prepared with Sawdust, Risk Husk, and Charcoal: Effect of Material Mixing Ratio","authors":"Jung-Woo Hwang, Seung-Won Oh","doi":"10.5658/wood.2022.50.2.104","DOIUrl":"https://doi.org/10.5658/wood.2022.50.2.104","url":null,"abstract":"Indoor air quality is a very important environmental factor in modern society. However, air pollutants generated from various interior construction materials significantly affect the human body, including formaldehyde (HCHO) and volatile organic compounds that threaten public health by deteriorating indoor air quality. Effective in removing these harmful substances are porous materials, such as woodceramics. In this study, charcoal, a porous material, was added to rice husk, an agricultural by-product, and sawdust generated during the sawing process to prepare boards and ceramics at different mixing ratios, and the HCHO deodorization performance and far-infrared emission characteristics were measured. As the mixing ratio of charcoal increased, the deodorization rate of the boards and ceramics tended to increase. Overall, the deodorization rate was measured to be 80% to 90%, indicating that the boards and ceramics prepared with charcoal are suitable to be used for the purpose of deodorization. The effect of the material mixing ratio on far-infrared emissivity and emission power was insignificant.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"47806748","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 2

Effect of Different Conditions of Sodium Chloride Treatment on the Characteristics of Kenaf Fiber-Epoxy Composite Board 不同氯化钠处理条件对红麻纤维环氧复合板性能的影响

Journal of the Korean wood science and technology Pub Date : 2022-03-01 DOI: 10.5658/wood.2022.50.2.93

T. Setyayunita, R. Widyorini, S. N. Marsoem, D. Irawati

{"title":"Effect of Different Conditions of Sodium Chloride Treatment on the Characteristics of Kenaf Fiber-Epoxy Composite Board","authors":"T. Setyayunita, R. Widyorini, S. N. Marsoem, D. Irawati","doi":"10.5658/wood.2022.50.2.93","DOIUrl":"https://doi.org/10.5658/wood.2022.50.2.93","url":null,"abstract":"Currently, biofibers are used as a reinforcement in polymer composites for structural elements and construction materials instead of the synthetic fibers which cause environmental problems and are expensive. One of the chemicals with a pH close to neutral that can be potentially used as a modified fiber material is sodium chloride (NaCl). Therefore, this study aims to investigate the characteristics of a composite board made from NaCl-treated kenaf fiber. A completely randomized design method was used with consideration of two factors: the content of NaCl in the treatment solution (1 wt%, 3 wt%, and 5 wt%) and the duration of immersion of fibers in the solution (1 h, 2 h, and 3 h). The NaCl treatment was conducted by soaking the fibers in the solution for different durations. The fibers were then rinsed with water until the pH of the water reached 7 and subsequently dried inside an oven at 80 ℃ for 6 h. Kenaf fiber and epoxy were mixed manually with the total loading of 20 wt% based on the dry weight of the fiber. Physical and mechanical properties of the fibers were then evaluated based on JIS A 5908 particleboard standards. The results showed that increasing NaCl content in the fiber treatment solution can increase the physical and mechanical properties of the composite board. The properties of fibers treated with 5 wt% NaCl for 3 h were superior with a modulus of elasticity of 2.085 GPa, modulus of rupture of 19.77 MPa, internal bonding of 1.8 MPa, thickness swelling of 3%, and water absorption of 10.9%. The contact angle of untreated kenaf fibers was 104°, which increased to 80° and 73° on treatment with 1 wt% and 5 wt% NaCl for 3 h, respectively.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"44297739","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 5

Development of Bamboo Zephyr Composite and the Physical and Mechanical Properties 竹和风复合材料的研制及其物理力学性能

Journal of the Korean wood science and technology Pub Date : 2022-03-01 DOI: 10.5658/wood.2022.50.2.134

I. Sumardi, E. M. Alamsyah, Y. Suhaya, R. Dungani, I. M. Sulastiningsih, Syahdilla Risandra Pramestie

{"title":"Development of Bamboo Zephyr Composite and the Physical and Mechanical Properties","authors":"I. Sumardi, E. M. Alamsyah, Y. Suhaya, R. Dungani, I. M. Sulastiningsih, Syahdilla Risandra Pramestie","doi":"10.5658/wood.2022.50.2.134","DOIUrl":"https://doi.org/10.5658/wood.2022.50.2.134","url":null,"abstract":"The objective of this study is to determine the effect of fiber direction arrangement and layer composition of hybrid bamboo laminate boards on the physical and mechanical properties. The raw material used was tali bamboo ( Gigantochloa apus (J.A. Schultes) Kurs) rope in the form of flat sheets (zephyr) and falcata veneer ( Paraserianthes falcataria (L) Nielsen). Zephyr bamboo was arranged in three layers using water-based isocyanate polymer (WBPI) with a glue spread rate of 300 g/m 2 . There were variations in the substitution of the core layer with falcata veneers (hybrid) as much as two layers and using a glue spread rate of 170 g/m 2 . The laminated bamboo board was cold-pressed at a pressure of 22.2 kgf/cm 2 for 1 h, and the physical and mechanical properties were evaluated. The results showed that the arrangement of the fiber direction significantly affected the dimensional stability, modulus of rupture, modulus of elasticity, shear strength, and screw withdrawal strength. However, the composition of the layers had no significant effect on the physical and mechanical properties. The bonding quality of bamboo laminate boards with WBPI was considered to be quite good, as shown by the absence of delamination in all test samples. The bamboo hybrid laminate board can be an alternative based on the physical and mechanical properties that can meet laminated board standards.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"70827932","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 6

Experimental Investigation of the Sound Absorption Capability of Wood Pellets as an Eco-Friendly Material 木屑颗粒作为环保材料吸声性能的实验研究

Journal of the Korean wood science and technology Pub Date : 2022-03-01 DOI: 10.5658/wood.2022.50.2.126

E. Jang

引用次数: 11

Phytochemical and Anti-Termite Efficiency Study of Guibourtia tessmanii (harms) J. Léonard (Kévazingo) Bark Extracts from Gabon 加蓬革叶树皮提取物的植物化学及灭白蚁效果研究

Journal of the Korean wood science and technology Pub Date : 2022-03-01 DOI: 10.5658/wood.2022.50.2.113

Ley-Fleury ELLA NKOGO, C. S. A. BOPENGA BOPENGA, Franck-Estime Ngohang, L. Mengome, Sophie Aboughe Angone, P. Edou Engonga

{"title":"Phytochemical and Anti-Termite Efficiency Study of Guibourtia tessmanii (harms) J. Léonard (Kévazingo) Bark Extracts from Gabon","authors":"Ley-Fleury ELLA NKOGO, C. S. A. BOPENGA BOPENGA, Franck-Estime Ngohang, L. Mengome, Sophie Aboughe Angone, P. Edou Engonga","doi":"10.5658/wood.2022.50.2.113","DOIUrl":"https://doi.org/10.5658/wood.2022.50.2.113","url":null,"abstract":"This study aimed to explore the biodiversity of chemical compounds found in the bark of Guibourtia tessmannii from Gabon, commonly called Kévazingo, and evaluate their anti-termite activity to determine their potential values as a source of development of anti-termite products that can be valued in the fields of fine chemicals and wood preservation. Extraction of G. tessmannii bark powders was carried out using the cold maceration method with trichloroethylene, acetone, ethanol, and water. Phytochemical screening made it possible to highlight groups of chemical families present in the extracts. Anti-termite activity was tested on the wild termites “Cubitermes sp” of the genus Isoptera. The yield of the extracts were 17.11% for the buttress and 13.42% for the height at 6 m. Phytochemical tests revealed that alkaloids, polyphenols, sterols, tannins, reducing compounds, flavonoids, saponins, and anthraquinones were present in the extracts. Results of anti-termite activity indicated that anti-termite activity varied with the different parts of the bark studied, extraction solvent, and concentration (50/50) and (25/75) of the extracts used. The extracts at 50/50 concentration showed a slightly better anti-termite activity compared to the 25/75 concentration. In addition, the buttress Kévazingo or buttress showed the strongest anti-termite activity for the aqueous extract with a survival rate of 0% after 2 days.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"48747859","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 7

The Relationship between Tree-Ring Growth in Pinus densiflora S. et Z. and the Corresponding Climatic Factors in Korea 韩国赤松年轮生长与气候因子的关系

Journal of the Korean wood science and technology Pub Date : 2022-03-01 DOI: 10.5658/wood.2022.50.2.81

Kwang-Hee Lee, S. Jo, S. Kim

{"title":"The Relationship between Tree-Ring Growth in Pinus densiflora S. et Z. and the Corresponding Climatic Factors in Korea","authors":"Kwang-Hee Lee, S. Jo, S. Kim","doi":"10.5658/wood.2022.50.2.81","DOIUrl":"https://doi.org/10.5658/wood.2022.50.2.81","url":null,"abstract":"To analyze the relationship between climatic factors (mean monthly temperature and total precipitation) and tree-ring growths of Pinus densiflora S. et Z. from National Parks (according to region) of the Korea, 20 trees were sampled from 13 National Parks. Only trees that were successfully cross-dated were used for dendrochronological analysis, and at least 11 trees were included. The tree-ring chronology of Mt. Bukhan (covering the shortest period of 1917–2016 [100 years]) was assessed, as well as that of Mt. Seorak (covering the longest period of 1687–2017 [331 years]). After cross-dating, each ring width series was doublestandardized by first fitting a logarithmic curve and then a 50-year cubic spline. The relationships between climate and tree-ring growth were calculated with response function analysis. The results show a significant positive correlation between a given year’s February-March temperature, May precipitation levels, and tree-ring growth. It indicates that a higher temperature in early spring and precipitation before cambium activity are important for radial growths of Pinus densiflora in the Korea.","PeriodicalId":17357,"journal":{"name":"Journal of the Korean wood science and technology","volume":null,"pages":null},"PeriodicalIF":0.0,"publicationDate":"2022-03-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"43037241","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":0,"RegionCategory":"","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

引用次数: 3

Mechanical Behavior of Treated Timber Boardwalk Decks under Cyclic Moisture Changes 经处理的木板路层板在循环湿度变化下的力学行为

Journal of the Korean wood science and technology Pub Date : 2022-01-01 DOI: 10.5658/wood.2022.50.1.68

Jian Liu, Y. Ji, Jianshou Lu, Z. Li

引用次数: 1