Papers by Author: Yi Xing Liu

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Authors: Jiang Tao Shi, Jian Li, Yi Xing Liu, Lei Xu
Abstract: wood is the most abundant renewable resource and environmentally friendly energy source on the earth, it not only provides industrial raw materials for economic and social sustainable development, meanwhile, the biological process of wood formation which is mainly to sink the excessive carbon dioxide in the atmosphere can also play an active role in reducing “greenhouse effect”, so it is the contributor of green environment and human heath. Therefore, it is of great importance to explore the biosynthesis process and the wood formation mechanism of woods cellulose. This study adopted RT-PCR to clone gene fragments from the total RNA of populus ussuriensis secondary xylem, through sequence analysis, we found that its size was 487bp, which was named as PusC1,by means of blast comparative analysis, we found that the gene sequence similarity of this fragment and Populus trichocarpa cellulose synthase (XM 002305024.1) reached 94%, and its gene sequence similarity with Populus tremuloides PtrCesA1 and Populus tremula × Populus tremuloides xylem specificity cellulose synthase genes (AY573574.1) sequence could also reach 92%. Therefore, it is inferred to be populus ussuriensis xylem specificity cellulose synthase gene fragment. Through sequence similarity, we can also infer that populus ussuriensis has a close genetic relationship with Populus trichocarpa and belongs to cathay poplar species; while Populus tremuloides belongs to white poplar species and has a close genetic relationship with populus ussuriensis.
Authors: Yun Lu, Yi Xing Liu, Hai Peng Yu, Qing Feng Sun
Abstract: Controlled anatase TiO2 was grown on cellulose surface using a fragile hydrothermal method in different conditions. With the analysis of FTIR spectra, the grown TiO2 was chemically attached to the cellulose surface. The morphologies and amount of grown TiO2 on cellulose surface could be controlled through the adjustment of reacting factors. From the observation of SEM images, the morphology and content of TiO2 grown on cellulose surface could be controlled under appropriate reaction conditions. Under the regulation of reactant conditions, the content ranging from 8.7%-34.2% of TiO2 could be grown on cellulose surface.
Authors: Liang Qing Yang, Yi Xing Liu, Ying Chun Cai, Qing Feng Sun
Abstract: This Study Investigated the Conventional Drying Characteristics of Birch (Betula Costata) Tree Disk Impregnated with NaCl Solution. the Results Showed that NaCI Content in Wood Was Depending on Impregnated Times, and the Relationship between them Was Linear Dependence. the Drying Duration of Treated Disk Was Longer by 25% than that of Untreated Disk. Na+ and Cl-, which Were Easy to Enter the Cell Wall and Combined with Microfibril, which Was the Major Reason for Enhancing Tensile Strength Perpendicular to the Grain and Restrain Cracks.
Authors: Yong Feng Li, Duo Jun Lv, Chi Jiang, Yi Xing Liu, Hong Yue Zhang
Abstract: A new composite, wood-polymer composite, was fabricated by formation of poly (methyl methacrylate) in wood cellular structure. Methyl methacrylate (MMA) monomer and a few of 2,2'- azobisisobutyronitrile (AIBN) as an initiator, as well as several drops of pyrimidine as catalyst were first impregnated into wood porous structure under a pressure condition, and then initiated for thermal polymerization through a catalyst-thermal treatment. The mechanical properties of the composite were tested, and the composite was also analyzed by SEM and DSC to further correlate its performance. The results indicated that the modulus of rupture, modulus of elasticity, compression strength and hardness of Wood-PMMA Composite were improved by 68.28%, 110.27%, 62.43%, 357% over those of Untreated Wood, respectively. The SEM observations showed that PMMA generated and filled up wood pores under the employed conditions, and thus reinforced the mechanical properties of wood. DSC analysis suggested that Wood-PMMA Composite was more thermal stability than Untreated Wood as the formation of PMMA within wood pores.
Authors: Yun Lin Fu, Yong Feng Li, Yi Xing Liu, Bao Gang Wang
Abstract: A novel Wood-Polymer Composite, Wood-PSt composite combining both advantages of wood and polystyrene was fabricated by determining the polymerization craft of monomer in wood porous structure through impregnating monomer into wood pores and followed by in-situ polymerization through a thermal-catalyst treatment. The performance was examined, and its structure was also characterized by SEM and FTIR. The results indicate that the optimum polymerizing craft is: 80oC, 8h and 3% AIBN. Under the optimum craft, the mechanical properties involving modulus of elasticity and compression strength were linearly increased with content of polystyrene. SEM and FTIR show that styrene polymerized under the employed polymerization craft, and the resultant polystyrene relatively full generated in wood cellular structure, in accordance with the results of the optimum polymerizing craft. Such composite having good mechanical properties and biomass features can be widely used in fields of construction, traffic and furniture.
Authors: Wen Shuai Chen, Hai Peng Yu, Peng Chen, Nai Xiang Jiang, Jiang Hua Shen, Yi Xing Liu, Qing Li
Abstract: Cellulose micro/nano fibrils generated from biomass are relative new reinforcing materials for polymer composites, which have potential lightweight and high strength and are renewable. In the present study, the preparation method of extracting cellulose micro/nano fibrils from wood was introduced. After successful disintegration, the morphological characteristics of the wood fibers, purified cellulose fibers, cellulose fibers activated by ultrasonic-wave and cellulose micro/nano fibrils after homogenization treatment, were compared by visual examination and scanning electron microscopy. The results showed that cellulose micro/nano fibrils have been efficiently extracted from wood, which have great potential in the application areas of papermaking, bio-nanocomposites, food, cosmetics/skin cream, medical/pharmaceutical, and so on.
Authors: Yong Feng Li, Yi Xing Liu, Feng Hu Wang, Duo Jun Lv, Chi Jiang
Abstract: Inspired from the natural porous structure of wood, a novel wood-polymer composite combining both advantages of wood with high strength-to-weight ratio as a natural renewable resource and polymer as a reinforcer was manufactured by synthesis of terpolymer of methyl methacrylate (MMA), Styrene (St) and Vinyl Acetate (VAc) inside wood. The three kinds of monomers with a few of 2,2'- azobisisobutyronitrile (AIBN) as an initiator, as well as some additives were first impregnated into wood porous structure under a pressure condition, and then initiated for terpolymerization through a catalyst-thermal treatment. The impregnating conditions containing pressure value and pressure time, and polymerizing crafts including heating temperature and heating time, as well as additive content were confirmed according to rate of monomer loading and rate of polymer loading inside wood. Results indicate that among these influencing factors, pressure and temperature were the significant influencing factors; and the rate of monomer loading and rate of polymer loading linearly positive correlated to them, respectively. SEM observation shows that the terpolymer fully filled in wood porous structure under the optimum manufacturing craft.
Authors: Liang Qing Yang, Yi Xing Liu, Ying Chun Cai, Qing Feng Sun, Jiang Tao Shi
Abstract: This paper aimed to investigate the influence of NaCl to water molecular movement. The interpretation is that NaCl could change structure of microscopic capillary in wood and increase energy consumption for water movement in capillary. Crystallized of NaCl in capillary made the pipe diameter diminished, resulted in the reduce of movement velocity for water, at the same time the adsorbed water increased, which leaded to consume more energy to destroy this bond force between adsorbed water and wood or NaCl.
Authors: Jian Li, Jian Qiu, Yi Xing Liu, Hai Peng Yu
Abstract: Based on the fast-growing and abundant lightwood as ground mass, the study applies the formation principle of aerogel, uses such low-carbon treatment technologies as sol-gel method, Lowry method and supercritical drying method, prepares and forms an environment-friendly aerogel-type wood. The result of study shows that the new type of material not only has the natural biological structure of wood, but also has some fine features of aerogel, and is easily accepted by the environment.
Authors: Yao Xing Sun, Gui Zhen Fang, Yi Xing Liu
Abstract: Waterborne preservative of DDAC and boride are used to impregnate P. ussuriensis Kom lumbers by roller compression under compression rates ranging from 10 percent to 50 percent. Results showed that the cranny in intervascular pit membranes appeared, and the cell wall of vessel element and fiber segment displayed drape and cranny due to roller compression. With the rise of compression rate, both the penetration depth of preservative and the retention quantity of preservative in the experimental lumber increased, while the mass loss rate decreased.The penetration depth perpendicular to the grain was more than 3.9 mm, while that parallel to the grain of wood was more than 20 mm when the compression rate was greater than or equal to 30 percent. Under the compression rate of 30 percent, the retention quantity of preservative in the experimental lumber impregnated with DDAC (thickness of 1 percent) was 8.743 kg/m3 and the mass loss rate was 14.36 percent, while those with boride (thickness of 2 percent) are 3.322kg/m3 and 9.92 percent.
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