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Fire retardancy of wood flour/PS composites treated with APP-starch

Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric materials science and Engineering 2008年第11期24卷 83-86页

作者： Fang, Yi-Qun Wang, Qing-Wen Song, Yong-Ming Zhang, Zhi-Jun Key Laboratory of bio-Based Material Science and Technology Northeast Forest University Harbin 150040 China

The fire retardancy of wood-flour/polystyrene composites (WF-PS) treated by ammonium polyphosphate (APP)-starch was studied by using a cone calorimeter. The results show that under a heat flux of 35 kW/m2, the heat release rate and the total heat release are decreased obviously while the charring is drastically increased and the time to ignition is prolonged by the addition of APP, however no significant influence on the effective heat of combustion is observed, this suggests the condensed phase fire retardant mechanism of APP in which the catalytic charring effect of APP on wood shall be very important. Adding starch as a charring agent is effective to improve the fire performance of APP, and APP-starch is an effective intumescent fire-retardant system to WF-PS. APP-starch system has negative effects on the mechanical properties of WF-PS, however it is minor when the dosage of APP is under 10% and starch is under 2%.

关键词： Starch

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Improvement in compatibility and mechanical properties of modified wood fiber/polypropylene composites

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中国高等学校学术文摘·林学 2008年第2期3卷 243-247页

作者： Wenjie DANG Yongming SONG Qingwen WANG Weihong WANG China Wood Conservation and Substitution Development Center Beijing 100834China Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry UniversityHarbin 150040China

To improve the interfacial compatibility between wood fibers and polypropylene and the toughness of wood-fiber/polypropylene composites, maleic anhydride grafted polypropylene (PP-g-MAH) and maleic anhydride grafted styrene-ethylene-butadiene-styrene copolymers (SEBS-g-MAH) were used as modifiers. Mechanical properties of wood-fiber/polypropylene (WF/PP) composites were improved when PP-g-MAH or SEBS-g-MAH was added. When either of these copolymers was added, the composites had better interfacial compatibility than the unmodified composite. This was verified by scanning electron microscope (SEM) observations and dynamic mechanical analysis (DMA). The mechanical properties of the composites were significantly improved because of the good interfacial bonding between wood fibers and polypropylene when PP-g-MAH and SEBS-g-MAH were added.

关键词： wood fiber polypropylene PP-g-MAH SEBS-g-MAH

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Preparation and performances research of two kinds of polymerizable quaternary ammonium salt

Shiyou Huagong Gaodeng Xuexiao Xuebao/Journal of Petrochemic...

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Shiyou Huagong Gaodeng Xuexiao Xuebao/Journal of Petrochemical Universities 2008年第1期21卷 42-45页

作者： Chen, Yu Tang, Huan-Lin Liu, Yun-Fei Yu, Hai-Peng Liu, Yi-Xing Tan, Hui-Min School of Materials Science and Engineering Beijing Institute of Technology Beijing 100081 China Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 China

Two kinds of polymerizable vinyl quaternary ammonium salt, namely dimethyldiallyl ammonium chloride-and trimethyldiallyl ammonium chloride respectively, were prepared via the SN2 nucleophilic substitution of the allyl chloride with the tertiary amine. The structure of the prepared quaternary ammonium salts were characterized through the methods of element analysis, FTIR, H1-NMR and C13-NMR. Two kinds of polyampholytic superabsorbent polymer, which include CMCTS-g-(PAA-co-PDMDAAC) and CMCTS-g-(PAA-co-TMAAC) respectively, were prepared through graft copolymerization of prepared vinyl quaternary ammonium salt and acrylic acid onto the chain of carboxymethyl chitosan, initiated with persulfate and crosslinked properly. The structure of the superbasorbent polymer was characterized by FTIR. Influence of the pH value of the solution on the swelling ratio of the polyampholytic superabsorbent polymer was studied.

关键词： Polyampholytic Superabsorbent polymer Vinyl quaternary ammonium salt

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Heat transfer model of wood veneer mat for hot pressing

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Journal of Computational Information Systems 2007年第6期3卷 2389-2393页

作者： Li, Peng Wang, Fenghu Tao, Yubo Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 China

A two-dimensional unsteady mathematic model about heat transfer of wood veneer mat during hot pressing was built according to the energy balance equation. This model describes the temperature variation of a wood with locations and times during hot pressing. The visual numerical solution was obtained by using the PDE tool of MATlab and the calculated results were verified by experiments. A comparison was made between the calculated temperature curve and the measured temperature curve. The comparison shows that this model is suited for simulating heat transfer of a wood mat and the simulated results can be used to guide of the production of wood-based composites.

关键词： Veneers

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Impact of coupling agent on properties of wood-plastic composite

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中国高等学校学术文摘·林学 2007年第3期2卷 347-349页

作者： XU Min LI Shuai Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry UniversityHarbin 150040China

The impact of two coupling agents, maleic anhydride (coupling agent 1) and isocyanate (coupling agent 2) on the properties of wood-plastic composites (WPC) was studied. Wood-plastic composites were made with coupling agents 1 and 2 and properties were tested under the condition that the ratio of wood fiber to thermoplastic polymer was 7:3, target density was 0.7 g/cm3, press temperature was 175°C, press time was 8 min, and adding amount of coupling agent 2%. Results show that coupling agent 2 was superior to coupling agent 1 and had great effect on the physical and mechanical properties of WPC. When using the same coupling agent, the impact on their properties varied with different thermoplastic polymers. keywords wood fiber - thermoplastic polymer - coupling agent - wood-plastic composite - physical and mechanical properties Translated from China Forest Products Industry, 2006, 33(4): 30–32 [译自: 林产工业]

关键词： wood fiber thermoplastic polymer coupling agent wood-plastic composite physical and mechanical properties

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Applications of wavelet transformation in the nondestructive test of medium density fiberboard

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中国高等学校学术文摘·林学 2007年第2期2卷 227-230页

作者： WANG Fenghu ZHU Xiaodong SUN Jianping Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education Northeast Forestry UniversityHarbin 150040China

Taking medium density fiberboards (MDF) as samples, the feasibility of the applications of wavelet analysis in a nondestructive test is discussed in this paper. The main results are as follows: the modulus of elasticity of longitudinal resonance, measured by wavelet analysis, can replace the conventional static modulus of elasticity. Their correlation coefficient is significant (p < 0.01). The defect of samples can be judged by wavelet analysis, which is superior because it is a nondestructive test. keywords nondestructive evaluation (NDE) - wavelet transformation - medium density fiberboard - modulus of elasticity __________ Translated from Scientia Silvae Sinicae, 2006, 42(10): 91–94 [译自: 林业科学]

关键词： nondestructive evaluation (NDE) wavelet transformation medium density fiberboard modulus of elasticity

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Separation and purification of Arabinogalactan obtained from Larix gmelinii by macroporous resin adsorption

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Journal of Forestry Research 2007年第1期18卷 81-83页

作者： HUANG Zhan-hua FANG Gui-zhen ZHANG Bin Northeast Forestry University Key Laboratory of Bio-based Material Science and Technology Ministry of Education Harbin 150040 P. R. China

Arabinogalactan （AG） obtained from Larix gmelinii R. waS purified with the method of macroporous resin adsorption. Effects of various parameters on the adsorption, including adsorption time and temperature, the concentration and the dosage of raw AG the reused numbers of resin, were investigated. The effect of purification was tested through the removal rate of impurity and the contents of AG and impurity. The optimal condition was determined as follows： adsorbed at 30℃ for 2 h with the concentration of raw AG 〈0.1 g·mL^-1 and its dosage 〈 7 mL, the dose of resin was 3 g and reused for 4 times. On the basis of these, macroporous resin column was used for AG purification. The result showed that the AG yield could reach 68.28% with sugar content of 95.02%. The analysis of IR and UV showed that the effect of macroporous resin characteristics on the purification of AG was significant. The obtained product had the same functional groups with standard sample.

关键词： Arabinogalactan Larix gmelinii R. Macroporous resin

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Application of image processing programs for OSB research

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Journal of Computational Information Systems 2007年第2期3卷 733-738页

作者： Li, Peng Wang, Fenghu Chen, Siguo Wang, Sunguo Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 China Forest Products Business Unit Alberta Research Council Edmonton Alta. T6H 1E4 Canada

The authors introduced four MATlab image-processing programs for orientated strand board (OSB) research. These programs have been used to detect OSB panel voids, to characterize voids within the simulated mat, and to transform the distorted images from the X-ray scanning system and Infrared system. The successful running of these programs showed that the primary programming codes were compact and efficient, and that image processing programs can be used for different applications in OSB research, including panel and mat voids measurements as well as image transformation. By means of simple modifications it is possible for the programs to fulfill more complex image processing procedures than the examples specified in this paper. These programs and their program design principles can be directly utilized as a reference in research and teaching, especially for image analysis of composite panels and/or mats.

关键词： Image analysis

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Effect of maleic anhydride grafted styrene-ethylene-butylene-styrene （MA-SEBS） on impact fracture behavior of polypropylene / wood fiber composites

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Journal of Forestry Research 2007年第3期18卷 203-207页

作者： GUO Chui-gen WANG Qing-wen MOE Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 P. R. China

MA-SEBS as compatibilizer and impact modifier was incorporated into Polypropylene/Wood Fiber （PP/WF） to enhance interface adhesion and impact strength of the composite. The effect of MA-SEBS content on the impact fracture behavior of PP/WF composites was studied. The impact properties of composites with 8% MA-SEBS reached the maximum value. And further increasing of MA-SEBS content to 10% did not improve the fracture toughness, but improved the stiffness of composites by DMA analysis. This was attributed to the improved PP/WF adhesion. As the MA-SEBS content is more than 8%, the molecule interaction of PP and WF was expected to much stronger than lower MA-SEBS. Scanning electron microscopy （SEM） was performed to analyze the impact fracture surface and showed a stronger affinity for the wood surfaces.

关键词： Polypropylene Wood fiber/polypropylene composites Fracture behavior Impact test

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Comparison Study on Self-Calibration Level Fusion Algorithm with Bayes Estimation Theory for Wood Drying Kiln Industry Process

Comparison Study on Self-Calibration Level Fusion Algorithm ...

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IEEE International Conference on Mechatronics and Automation

作者： Jun Cao Jiawei Zhang Yixing Liu School of Electromechanical Engineering Northeast Forestry University Harbin Heilongjiang China Key Laboratory of Bio-Based Material Science and Technology Northeast Forestry University Harbin Heilongjiang China

Since the complex operation environment in wood drying kiln, the precision of lumber moisture content (LMC) is affected greatly with the ambient parameters which have closed multi-couple and correlated relation with them. based on above reasons background, a comparison study on self-calibration level fusion algorithm based Bayes estimation theory for wood drying-kiln industry process is presented in this paper. Starting with analyzing the existing problems of LMC measured by individual sensor, we then put forward the architecture of multi-sensor data fusion for LMC measuring system. The performance of self-calibration level is detailed discussed. The technique of the determination of confidence distance and optimal fusion set, the total probability maximum algorithm, the Bayes estimation algorithm, and arithmetic averaging method are investigated respectively. Comparison the simulation results, a self-calibration fusion algorithm based Bayes estimation theory is determined.

关键词： Estimation theory Kilns Cement industry Wood industry Sensor phenomena and characterization Moisture Sensor fusion Automation Forestry Industrial relations

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