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2012 International Conference on biobase material science and Engineering, BMSE 2012

作者： Yingfeng, Zuo Jiyou, Gu Haiyan, Tan Yanhua, Zhang Key Laboratory of Bio-based Material Science and Technology Ministry of Education Northeast Forestry University Harbin 150040 China

ISBN: (纸本)9781467323833

Formamide and urea were used as plasticizers for corn starch to prepare formamide plasticized-thermoplastic starch (FPTPS) and urea plasticized- thermoplastic starch (UPTPS), respectively. The properties of thermoplastic starch (TPS) were tested by scanning electron microscope (SEM), X-ray diffraction (XRD), differential scanning calorimetry (DSC), thermo gravimetric analysis (TGA) and mechanical testing machine. Scanning electron microscope result shows that both formamide and urea can make corn starch plasticized form uniform continuous phase, but plasticizing effect of formamide was better than that of urea. X-ray diffraction exhibits that the crystallization peaks of FPTPS were disappeared, and a reduction minish for UPTPS, the crystallinity of FPTPS was smaller than UPTPS. The gelatinization temperature of two kinds of thermoplastic starches was basically the same, but the gelatinization enthalpy of FPTPS was much less than UPTPS. Formamide was better plasticized than urea for corn starch, which made the TGA inflection temperature and residual quantity of FPTPS was lower than UPTPS. FPTPS tensile strength was lower than UPTPS, but the elongation at break was much bigger than UPTPS. © 2012 IEEE.

关键词： Urea

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Durability of wood-polymer composite prepared by in-situ polymerization of functional monomers

Durability of wood-polymer composite prepared by in-situ pol...

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2012 International Meeting on Opto-Electronics Engineering and materials Research, OEMR 2012

作者： Gong, Dingwang Liu, Zhenbo Huang, Huawei Zhang, Changqing Liang, Chen Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin 150040 China

ISBN: (纸本)9783037854884

Fast-growing plant wood, Micheliamacclurel wood, was modified by formation of wood-polymer composite to improve its decay resistance. Two functional monomers, glycidyl methacrylate and ethylene glycol dimethacrylate, added with a few Azo-bis-isobutryonitrile as initiator, and maleic anhydride as catalyst, were first impregnated into wood cell lumen under a vacuum-pressure condition, and then in-situ polymerized into copolymers through a catalyst-thermal treatment. The decay resistances of untreated wood and wood-polymer composites were assessed by weight loss and compared by SEM observations. SEM and FTIR analysis indicated that the in-situ polymerized copolymers fully filled up wood cell lumen and also grafted onto wood cell walls, resulting in the blockage of passages for microorganisms and moisture to wood cell walls. Thus, the decay resistance of the wood-polymer composite against brown rot fungus and white rot fungus in terms of weight loss achieved 1.04%~1.33%, improved 95.10%~95.35% than those of untreated Micheliamacclurel wood;and also higher than that of boron-treated wood. The SEM observations presented the remarkable improvement of decay resistance of wood after such treatment, which effectively protected wood from degradation by fungi. © (2012) Trans Tech Publications, Switzerland.

关键词： Wood

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Effects of water levels on morphologies and mechanical properties of water-blown polyurethane

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Gaofenzi Cailiao Kexue Yu Gongcheng/Polymeric materials science and Engineering 2012年第7期28卷 67-71页

作者： Chen, Tao Du, Haijing Mi, Yan Gao, Zhenhua Key Laboratory of Bio-Based Material Science and Technology of Ministry of Education Northeast Forestry University Harbin 150040 China

The morphologies and mechanical properties of water-blown polyurethane (PU) foams with various water levels (3-11phr) were characterized by scanning electron microscope (SEM), Fourier transform infrared spectra (FT-IR) and physi-mechanical evaluations. The results indicate that water level has various effect on the chemical compositions and microstructures of water-blown PU foams and affectes the physi-mechanical properties because water not only formed the gas for foaming but also involved with the chain-extension of polyurea-urethane resin. As water level increased from 3 phr to 11phr, the cream time, gel time, tack-free time, polyurea content and hydrogen bonding of PU foams increased gradually, while the density and mechanical properties of PU foam decreased accordingly. The water-blown PU foams with low density but good performances can be prepared by adjusting the water level.

关键词： Morphology

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Synthesis of a novel flame retardant containing phosphorus and sulfur and its application in polycarbonate

Synthesis of a novel flame retardant containing phosphorus a...

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作者： Zhao, Wei Li, Bin Xu, Miaojun Zhang, Lili Liu, Fangmeng Guan, Limin Heilongjiang Key Laboratory of Molecular Design and Preparation of Flame Retarded Materials College of Science Northeast Forestry University Harbin 150040 China Key Laboratory of Bio-Based Material Science and Technology Northeast Forestry University Ministry of Education Harbin 150040 China

A novel flame retardant containing phosphorus and sulfur, bis(2-tienyl)phenylphosphine (BTPP) was synthesized and characterized with Fourier transform infrared spectroscopy, 1H, 13C, and 31P nuclear magnetic resonance. BTPP was used to impart flame retardancy t polycarbonate (PC). Combustion behaviors and thermal degradation properties of PC/BTPP system were assayed by limiting oxygen index (LOI), vertical burning test (UL-94), cone calorimeter test, and thermogravimetric analysis. PC/3 wt% BTPP passed UL-94 V-0 rating with 3.0 mm samples and the LOI value was 36.5%. PC/6 wt% BTPP passed UL-94 V-0 rating with 1.6 mm samples and the LOI value was 38.5%. Scanning electron microscopy revealed that char properties had direct effects on the flame retardancy. Mechanical properties and water resistance of PC/BTPP system were also examined. After water resistance test, PC/3 wt% BTPP with 3.0 mm samples and PC/6 wt% BTPP with 1.6 mm samples kept V-0 rating and mass loss were only 0.2%. © 2012 Society of Plastics Engineers.

关键词： Polycarbonates

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FTIR Studies of the Changes in Wood Chemistry from Wood Forming Tissue under Inclined Treatment

FTIR Studies of the Changes in Wood Chemistry from Wood Form...

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2012 International Conference on Future Energy,Environment,and materials

作者： Jiangtao Shi Dong Xing Jian Li Key Laboratory of Bio-based Material Science and Technology of the Ministry of Education Northeast Forestry University

In order to investigate the chemical modifications of wood forming tissue from Pinus koraiensis under different stem inclined angle, the change was measured by Fourier Transform Infrared Spectroscopy(FTIR). The results showed that the relative intensities of absorption bands at 1510, 1457, 1232 and 1267 cm-1 increased significantly, whereas the relative intensities of absorption bands at 1739, 1371 and 1160 cm-1 decreased. The absorption peaks and quantitative analysis of lignin showed similar variation patterns in different inclined angle. However, the cellulose crystallinity calculated by spectrum information showed contradictory with early reports. The results indicated chemical variation was in wood forming tissue of inclined stems and it displayed correlation and similar change pattern.

关键词： wood forming tissue inclined treatment FTIR lignin Pinus koraiensis

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Study on Preparation and Performance of Diatomite-Wood Power/Polypropylene Composite

Study on Preparation and Performance of Diatomite-Wood Power...

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World Automation Congress (WAC)

作者： Liu Mingli Liu Yanlong Li Chunfeng Wang Fengqiang Wang Qingwen Wood Material Science and Engineering Key Laboratory of Jilin Province Beihua University Jilin China Key Laboratory of Bio-Based Material Science and Technology (Ministry of Education) Northeast Forestry University Heilongjiang China

ISBN: (纸本)9781467344975

this research prepared a diatomite-wood powder/polypropylene composite for making use of diatomite and wood powder polypropylene (PP). Mechanical test results showed that, compared to the samples without diatomite, the impact strength, static bending strength and tensile strength were increased by up to 25.9%, 8.2% and 9.5% respectively for the composites with proper diatomite content. The Cone Calorimeter tests for the combustion performance of the composites found that the composite with 20 percent diatomite content has a decreased peak of the heat release rate and a reduced the total heat release compared to the composite without diatomite.

关键词： Diatomite Wood powder Polypropylene Mechanical properties Combustion performance

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Thermal and burning properties of wood flourpoly(vinyl chloride) composite

Thermal and burning properties of wood flourpoly(vinyl chlor...

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作者： Fang, Yiqun Wang, Qingwen Bai, Xiaoyan Wang, Weihong Cooper, Paul A. Key Laboratory of Bio-Based Material Science and Technology Northeast Forestry University Ministry of Education Harbin 150040 China Faculty of Forestry University of Toronto Earth Science Center 33 Willcocks Street Toronto ON M5S 3B3 Canada

The present study deals with the effects of wood flour on thermal and burning properties of wood flour-poly(vinyl chloride) composites (WF-PVC) using thermogravimetric (TG), cone calorimetry (CONE), and pyrolysis-gas chromatography/mass spectrometry (Py-GC/MS). TG tests show that an interaction occurred between wood flour and PVC during the thermal degradation of WF-PVC. Wood flour decreased the temperature of onset of decomposition of PVC. However, the char formation could be increased by adding wood flour to PVC. CONE test indicates that wood flour had positive effects on heat release and smoke emission of PVC. Comparing with PVC, WF-PVC reduced average heat release rate and the peak HRR by about 14 and 28%, respectively;smoke production rate was also decreased. The degradation mechanism was studied by Py-GC/MS. The results show that the volatile pyrolysis products of WF-PVC are very different from PVC. The yields of HCl and aromatic compounds decreased dramatically, and the aliphatic compounds increased by the incorporation of WF. © Akadémiai Kiadó, Budapest, Hungary 2011.

关键词： Polyvinyl chlorides

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FTIR Studies of the Changes in Wood Chemistry from Wood Forming Tissue under Inclined Treatment

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Energy Procedia 2012年 16卷 758-762页

作者： Jiangtao Shi Dong Xing Jian Lia Key Laboratory of Bio-based Material Science and Technology of the Ministry of Education Northeast Forestry University Harbin 150040 P. R. China

In order to investigate the chemical modifications of wood forming tissue from Pinus koraiensis under different stem inclined angle, the change was measured by Fourier Transform Infrared Spectroscopy (FTIR). The results showed that the relative intensities of absorption bands at 1510, 1457, 1232 and 1267 cm-1 increased significantly, whereas the relative intensities of absorption bands at 1739, 1371 and 1160 cm-1 decreased. The absorption peaks and quantitative analysis of lignin showed similar variation patterns in different inclined angle. However, the cellulose crystallinity calculated by spectrum information showed contradictory with early reports. The results indicated chemical variation was in wood forming tissue of inclined stems and it displayed correlation and similar change pattern.

关键词： wood forming tissue inclined treatment FTIR lignin Pinus koraiensis

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Hydrogenation of Alkali Lignin Catalyzed by Pd/C

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APCBEE Procedia 2012年 3卷 53-59页

作者： Ye Jie-wang Fang Gui-zhen Jin Chun-de National Engineering & Technology Research Center of Wood–based Resources Comprehensive Utilization ZheJiang A & F University Lin’an 311300 China Key Laboratory of Bio-based Material Science and Technology Northeast Forestry University Harbin 150040 China

Hydrogenation of alkali lignin was carried out in the presence of Pd/C catalyst at hydrogen pressure 1∼5 MPa. Catalytic activity of Pd/C catalyst was investigated according to the structure changes of alkali lignin, which were characterized by UV and 1 H-NMR spectroscopy. The measurement of average molecular weight undertook by gel permeation chromatography (GPC). Changes on function groups of alkali lignin were analyzed through chemical methods. Results show that total hydroxyl, phenolic hydroxyl and alcoholic hydroxyl increase 64.23%, 37.10% and 89.67%, respectively, while carbonyl and carboxyl decrease separately 43.50% and 53.41%. No significant differences of the total acidic groups and the phenyl structure were found after reaction. GPC analysis shows the weight average molecular weight (Mw) and number average molecular weight (Mn) are both decreased, and the polydispersity of alkali lignin is increased The active function groups of alkali lignin are increased obviously, and reactive activity of alkali lignin is enhanced as a result. The present results demonstrate Pd/C catalyst shows an excellent catalytic activity on reductive reaction of alkali lignin and hydrogen.

关键词： Pd/C Catalyst Alkali Lignin Hydrogenation Activation

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Lime treatment of prehydrolysis liquor from the kraft-based dissolving pulp production process

Lime treatment of prehydrolysis liquor from the kraft-based ...

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作者： Shen, Jing Fatehi, Pedram Soleimani, Pendar Ni, Yonghao Key Laboratory of Bio-based Material Science and Technology of Ministry of Education Material Science and Engineering College Northeast Forestry University Harbin 150040 China Department of Chemical Engineering Limerick Pulp and Paper Centre University of New Brunswick Fredericton NB E3B 5A3 Canada Department of Chemical Engineering Faculty of Engineering Lakehead University Thunder Bay ON P7B 5E1 Canada

In this study, the concept of using lime for the treatment of industrially produced prehydrolysis liquor (PHL) of kraftbased dissolving pulp production process was tested, and its effect on the concentrations of acetic acid, furfural, UV lignin, and hemicelluloses was explored. Lime treatment resulted in a significant increase in the acetic acid concentration due to alkaline hydrolysis of the acetyl groups bound to the dissolved hemicelluloses in PHL, and the degradation of sugars. At relatively high lime dosages (e.g., above 1.7%), furfural was completely eliminated,while the lignin concentration decreased by 20-25%.The hemicelluloses concentration can be significantly decreased due to the alkaline oxidative degradation. However, when performed in the absence of oxygen/air by bubbling carbon dioxide to the lime/PHL system, the degradation of hemicelluloses was effectively minimized. © 2011 American Chemical Society.

关键词： Lime

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