Mechanical Properties of Moso Bamboo Treated with Chemical Agents
Keywords:
Biomass, moso bamboo, surface chemical property, thermal-mechanical property, chemical treatmentAbstract
Bamboo is a type of biomass material and has great potential as a bioenergy resource for the future in China. Surface chemical and thermal-mechanical behavior play an important role in the manufacturing process of bamboo composites and pellets. In this study, moso bamboo was treated by sodium hydrate solution and acetic acid solution. Surface chemical and dynamic mechanical properties of bamboo were determined using Fourier transform infrared spectroscopy and dynamic mechanical thermal analysis, respectively. Results showed that the main polar chemical groups of the outer layer of bamboo (OB) included hydroxyl group (O-H) and ester carbonyl (C=O). Some new polar chemical groups appeared on the inner layer of the bamboo surface (MB) such as aromatic ethers (C-O-C) and phenolic hydroxyl (C-O). The chemical group difference of OB and MB confirms that there was a waxy layer on the OB surface. Nonpolar chemical groups decreased and polar chemical groups increased on the OB surface when it was treated by acetic acid solution. The waxy layer of the OB surface was removed and the lignin structure was also destroyed by sodium hydrate solution. The general feature of thermal-mechanical properties with temperature was similar to cellulosic materials for OB, OB-NaOH (OB treated by sodium hydrate solution), and OB-acetic (OB treated by acetic acid solution). A lower storage modulus of OB-NaOH and OB-acetic was helpful to improve physical properties of bamboo pellets. There was an α transition (α1) peaking at about 65°C for OB. The second major relaxation (α2) occurred at 35°C. The α1 and α2 transition temperature of OB changed when it was treated by chemical agents. This information is very important for using bamboo to manufacture composites and pellets.References
Cheng RX, Gu JY (2002) Wettability of larch, birch and oak. Journal of Northeast Forestry University 30(3):29-31.nCui HW, Du GB (2008) MWP influence of surface wettability on pinus yunnanensis wood treated by microwave plasma. Journal of Northwest Agriculture and Forestry University 23(4):163-166.nEiichi O, Yuzo F, Joseph G (2003) Dynamic viscoelastic properties of wood acetylated with acetic anhydride solution of glucose pentaacetate. J Wood Sci 49:152-157.nGeorget DMR, Gunning PA, Parker ML, Smith AC (1996) The mechanical properties of pressed processed wheat material. J Mater Sci 31:3065-3071.nJiang JL, Lu JX (2009) Dynamic viscoelastic behavior of wood under drying conditions. Frontiers of Forestry in China 4:374-379.nJiang ZH (2002) World bamboo and rattan. Liaoning Science & Technology Press, Shenyang, China. 43 pp.nJiang ZH, Yu WJ, Yu YL (2006) Analysis of chemical components of bamboo wood and characteristic of surface performance. Journal of Northeast Forestry University 34:1-3.nKathleen VV, Paul K (1999) Wettability of natural fibers used as reinforcement for composites. Macromol Mater Eng 272:87-93.nKelley SS, Rials TG, Glasser WG (1987) Relaxation behavior of the amorphous components of wood. J Mater Sci 22:617-624.nKim HS, Yang HS, Kim HJ, Lee BJ, Hwang TS (2005) Thermal properties of agro-flour-filled biodegradable polymer bio-composite. J Therm Anal Calorim 81:299-306.nLi J (2003) Spectroscopy of wood. Chinese Science & Technology Press, Beijing, China. 110 pp.nLiu ZJ, Jiang ZH, Cai ZY, Fei BH, Yu Y, Liu XE (2012) Moisture of bamboo for pellets. Bioresources 7:1548-1557.nMahapatra AK, Harris DL, Durham DL, Lucas S, Terrill TH, Kouakou B, Kannan G (2010) Effects of moisture change on the physical and thermal properties of sericea lespedeza pellets. International Agricultural Engineer Journal 1:23-29.nNalladurai KR, Vance M (2010) Natural binders and solid bridge type binding mechanisms in briquettes and pellets made from corn stover and switchgrass. Biores Technol 101:1082-1090.nOlsson AM, Salmen L (1997) The effect of lignin composition on viscoelastic properties of wood. Nord Pulp Paper Res 12:140-144.nOhkoshi M (2002) FTIR-PAS study of light-induced changes in the surface of acetylated or polyethylene glycolimpregnated wood. J Wood Sci 48:394-401.nPandey KK (1999) A study of chemical structure of soft and hardwood and wood polymers by FTIR spectroscopy. J Appl Polym Sci 71:1969-1975.nPandey KK, Pitman AJ (2003) FTIR studies of the changes in wood chemistry following decay by brown-rot and white-rot fungi. International Biodeterioration and Biodegradation 52:151-160.nSalmen L (1984) Viscoelastic properties of in situ lignin under water saturated conditions. J Mater Sci 19:3090-3096.nSalmen L (1990) Thermal expansion of water saturated wood. Holzforschung 44:17-19.nSanchez-Cabezudo M, Masegosa RM, Salom C, Prolongo MG (2010) Correlations between the morphology and the thermo-mechanical properties in poly (vinyl acetate)/epoxy thermosets. J Therm Anal Calorim 102:1025-1033.nStelte W, Clemons C, Holm JK, Ahrenfeldt J, Henriksen UB, Sanadi AR (2011a) Thermal transition of the amorphous polymers in wheat straw. Ind Crops Prod 34:1053-1056.nStelte W, Holm JK, Sanadi AR, Barsberg S, Ahrenfeldt J, Henriksen UB (2011b) A study of bonding and failure mechanism in fuel pellets from different biomass resources. Biomass Bioenerg 35:910-918.nYang HS, Douglas JG, Kim HJ (2009) Viscoelastic and thermal analysis of lignocellulosic material filled polypropylene bio-composites. J Therm Anal Calorim 98:533-558.nYutaka K, Makoto K (2001) Depth profiling of photoinduced degradation in wood by FTIR microspectroscopy. J Wood Sci 47:325-327.nZhang Y, Zhou ZB, Yuan SF (2008) Study on the surface dynamic wettability and free energy of poplar. Journal of Nanjing Forestry University 32(1):49-52 (Natural Science Edition).n
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