MECHANICAL BEHAVIOR AND BIOLOGICAL RESISTANCE OF ACRYLONITRILE WOOD-POLYMER MODIFIED WITH ALKOXYSILAN

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SOBHANI OSKOUIE F.; GHORBANI M.; AMININASAB S.M.

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Journal: Journal of Wood and Forest Science and Technology Year:2017 | Volume:24 | Issue:1 Page(s): 103-116

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Title

MECHANICAL BEHAVIOR AND BIOLOGICAL RESISTANCE OF ACRYLONITRILE WOOD-POLYMER MODIFIED WITH ALKOXYSILAN

Author(s)

SOBHANI OSKOUIE F. | GHORBANI M. | AMININASAB S.M. | Issue Writer Certificate

Keywords

ACRYLONITRILEQ1

3-(TRIMETHOXYSILYL) PROPYL METHACRYLATEQ1

WOOD-POLYMERQ2

BIOLOGICAL PROPERTIESQ1

MECHANICAL BEHAVIORQ1

Abstract

Background and objectives: Wood modification with eco-friendly materials and methods improves the wood properties for many applications. Synthetic polymers are widely used for wood modification via wood impregnation with unsaturated monomers. Results in the fabrication of WOOD-POLYMER composites (WPC) through in-situ polymerization within wood pores. In modification with the ACRYLONITRILE vinyl monomer, the hydroxyl group of the cell wall are free and they could absorb moisture. So, a modifier presence with coupling effect between monomer and cell wall, could increase the wood service life. In this research, the effect of 3- (trimethoxysilyl) propyl methacrylate on mechanical and BIOLOGICAL PROPERTIES of ACRYLONITRILE WOOD-POLYMER was investigated.Material and Methods: Mechanical and biological test samples were prepared from straight grain and no defect timber of dried Poplar wood according to ASTM-D143 and EN113 standards respectively. Test samples were divided in 7 levels: control, modified with silane compound in subgroups of acidified Ethanol at 110 and 150oC, ethanol with and without Benzoyl peroxide as initiator at 150oC, ACRYLONITRILE/ Benzoyl Peroxide and combined level of silane/ACRYLONITRILE/ Benzoyl Peroxide. Sample's impregnation was carried out using vacuum-pressure method in the laboratory cylinder. Statistical analyses of mechanical and biological data were conducted using complete randomized design. Means of each treatment were compared according to Duncan multiple range tests.Results: Silane modification and ACRYLONITRILE presence in the composite were confirmed by infrared spectroscopy. Silane modification led to increase in mechanical strength of wood due to crosslink formation, and also created significant improvement in flexural modulus and hardness at acidic conditions and higher temperature. Adding initiator to silane modification, in addition to the cell wall modification, resulted in more activity in the free radicals and polymerization the part of silane in the lumens. The presence of ACRYLONITRILE in the lumen enhanced the mechanical properties. Combined modification by modifying the cell walls, filling cavities and linking between lumen polymer and cell wall in the presence of silane coupling agent, caused the more uniform distribution of force and significant improvement in the most mechanical strength compared to single modification with silane and ACRYLONITRILE. Also, presence of monomer improved the biological resistance of the resultant product. In acidic condition, higher temperature with further cell wall modification led to the significant decline of weight loss.Compared to the other single modifications, Silane modification containing initiator, with cell wall modification and physical blocking the entrance path of fungal hyphae and humidity, significantly decreased the decay weight loss. The combined Silan/ACRYLONITRILE modification showed the lowest weight loss exposed to fungal decay due to the linking between more silanol and hydroxyl groups of wood and ACRYLONITRILE presence in the lumens.Conclusion: Silane compound enhanced the mechanical and BIOLOGICAL PROPERTIES of ACRYLONITRILE wood polymer, which the improvement was more obvious at the higher temperature and under acidic conditions. Combined Silane/ACRYLONITRILE modification created maximum improvement in the most mechanical properties. Presence of a initiator with less weight loss exposed to fungal degradation, intensified bio-resistance compared to other silane modifications. Combined Silane/ACRYLONITRILE modification was presented the less fungal degradation that can be attributed to filling lumen and cell wall pores, less moisture and finally reduction of hyphae development, enzymes transfer and fungal hyphae access through the wood cell wall.

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APA: Copy

SOBHANI OSKOUIE, F., GHORBANI, M., & AMININASAB, S.M.. (2017). MECHANICAL BEHAVIOR AND BIOLOGICAL RESISTANCE OF ACRYLONITRILE WOOD-POLYMER MODIFIED WITH ALKOXYSILAN. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, 24(1), 103-116. SID. https://sid.ir/paper/156685/en

Vancouver: Copy

SOBHANI OSKOUIE F., GHORBANI M., AMININASAB S.M.. MECHANICAL BEHAVIOR AND BIOLOGICAL RESISTANCE OF ACRYLONITRILE WOOD-POLYMER MODIFIED WITH ALKOXYSILAN. JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY[Internet]. 2017;24(1):103-116. Available from: https://sid.ir/paper/156685/en

IEEE: Copy

F. SOBHANI OSKOUIE, M. GHORBANI, and S.M. AMININASAB, “MECHANICAL BEHAVIOR AND BIOLOGICAL RESISTANCE OF ACRYLONITRILE WOOD-POLYMER MODIFIED WITH ALKOXYSILAN,” JOURNAL OF WOOD AND FOREST SCIENCE AND TECHNOLOGY, vol. 24, no. 1, pp. 103–116, 2017, [Online]. Available: https://sid.ir/paper/156685/en

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