In order to evaluate the synergistic effect between initiator and silane agent, silane modified poplar veneer/HDPE film composites were prepared using HDPE film as wood adhesives, silane A-171(vinyltrimethoxysilane)dicumyl peroxide(DCP)as veneer modifier. Physical-mechanical properties of composites under different initiator DCP dosage(0, 0.05%, 0.10% and 0.15%)were investigated by mechanical testing machine, dynamic mechanical analysis(DMA)and scanning electronic microscope. The results showed that silane-treated poplar veneer and HDPE film were closely entangled by means of a chemical bond resulted from oxy radicals generated by DCP, which contributed to forming enhanced interlock and a stronger interface between the two phases. This kind of bonding interface in turn resulted in much higher mechanical properties, water-resistance and thermal stability. When DCP addition reached 0.15%, tensile strength, wood failure, modulus of rupture and modulus of elasticity values of the composites increased from 1.02 MPa, 2%, 60.10 MPa and 5 102 MPa to 2.07 MPa, 95%, 77.20 MPa and 6 822 MPa, respectively. It also caused water absorption and thickness swelling value decreased from 77.80% and 5.79% to 53.75% and 4.09%, respectively. Thermal stability of silane modified poplar veneer/HDPE film composites were also strengthened with the increase of DCP dosage by DMA results. The retention rate of storage modulus value at 130 ℃ increased from 44.19% to 88.34% when DCP content rose from 0 to 0.15%. This trend also applied to the bonding interface failure temperature, which lagged from 147 ℃ to 197 ℃.
{{custom_sec.title}}
{{custom_sec.title}}
{{custom_sec.content}}
References
[1] 中国林业科学研究院木材工业研究所. 环保型胶合板生产工艺:00134681.4[P]. 2000-12-05.
Research Institute of Wood Industry, Chinese Academy of Forestry. Production technical of environmental-friendly plywood: 00134681.4[P]. 2000-12-05.
[2] Yadama V, Guo K Q, Liu Y Y. Preparation and properties of cotton stalk bundles and high-density polyethylene composites using hot-press molding[J]. Journal of Reinforced Plastics and Composites, 2012, 31(15): 1017-1024.
[3] Fang L, Chang L, Guo W J, et al. Preparation and characterization of wood-plastic plywood bonded with high density polyethylene film[J]. European Journal of Wood and Wood Products, 2013, 71(6): 739-746.
[4] Wang W H, Zhang X Q, Li X P. A novel natural adhesive from rice bran[J]. Pigment & Resin Technology, 2008, 37(4): 229-233.
[5] Ando M, Sato M. Manufacture of plywood bonded with kenaf core powder [J]. Journal of Wood Science, 2009, 55(4): 283-288.
[6] Moubarik A, Allal A, Pizzi A, et al. Characterization of a formaldehyde-free cornstarch-tannin wood adhesive for interior plywood[J]. European Journal of Wood and Wood Products, 2010, 68(4): 427-433.
[7] 林群祥.高密度聚乙烯胶合板生产方法: 200710100722.4[P]. 2007-04-13.
Lin Q X.Manufacturing method of high density polyethylene based plywood: 200710100722.4[P]. 2007-04-13.
[8] Tang L, Zhang Z G, Qi J, et al. The preparation and application of a new formaldehyde-free adhesive for plywood[J]. International Journal of Adhesion & Adhesives, 2011, 31(6): 507-512.
[9] 方露,王雪花,熊先青,等.单板表面预处理对木塑复合胶合板耐湿循环能力的影响[J].林业工程学报,2016,1(1):37-41.
Fang L, Wang X H, Xiong X Q, et al. Effects of surface pretreatments on wet cycle resistance of wood-plastic plywood[J]. Journal of forestry Engineering,2016,1(1):37-41.
[10] Xie Y J, Hill C A S, Xiao Z F, et al. Silane coupling agents used for natural fiber/polymer composites: a review[J]. Composites Part A: Applied Science and Manufacturing, 2010, 41(7): 806-819.
[11] Ifuku S, Yano H. Effect of a silane coupling agent on the mechanical properties of a microfibrillated cellulose composite[J]. International Journal of Biological Macromolecules, 2015, 74: 428-432.
[12] Conzatti L, Giunco F, Stagnaro P, et al. Wool fibres functionalised with a silane-based coupling agent for reinforced polypropylene composites[J]. Composites Part A: Applied Science and Manufacturing, 2014, 61:51-59.
[13] Zhou F, Cheng G X, Jiang B. Effect of silane treatment on microstructure of sisal fibers[J]. Applied Surface Science, 2014, 292: 806-812.
[14] Fang L, Chang L, Guo W J, et al. Influence of silane surface modification of veneer on interfacial adhesion of wood-plastic plywood[J]. Applied Surface Science, 2014, 288: 682-689.
[15] Abdelmouleh M, Boufi S, Belgacem M N, et al. Modification of cellulose fibers with functionalized silanes: effect of fiber treatment on the mechanical performances of cellulose-thermoset composites [J]. Journal of Applied Polymer Science, 2005, 98(3): 974-984.
PDF(1718533 KB)
