Hüseyin PELİT, Esra KASAR, Abdullah SÖNMEZ

The Effect of Modification with Epoxy and Polyester Resins on Some Mechanical Properties of Pine and Chestnut Woods

In this study, the effects of epoxy and polyester resin applications on some mechanical strength properties of scots pine (Pinus sylvestris L.) and chestnut (castanea sativa) wood samples were investigated. Firstly, in the circular sawing machine, a different numbers of channels (2+1 and 3+2) were opened on the surfaces of wood samples. Then, these channels were filled with casting type epoxy and polyester resins. The density, modulus of repture (MOR), modulus of elasticity (MOE), and compression strength parallel to the grain (CS) tests were performed on the samples. According to the results of the study, the density values of pine and chestnut samples increased by 25% and 42%, respectively, depending on the number of channels after resin application. In addition, compared with epoxy resin applied samples, the density increase was higher in the polyester resin applied samples. After application of resins, a slight increase was observed in the MOR and MOE values of chestnut samples. However, CS values tend to decrease in these samples. In pine samples with resin applied, the strength properties (MOR, MOE and CS) decreased depending on the increase in the number of channels. Furthermore, the effect of the resin type on all strength properties of the samples was statistically insignificant.

Keywords:

Epoxy resin Mechanical properties, Polyester resin, Wood material,

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Bulmuş, V. & Pişkin, E. (2000). Epoksi reçineleri, mühendislik polimerleri, Pagev Yayınları, İstanbul, Türkiye.
Campbell, F.C. (2010). Structural composite materials, ASM international: Materials Park, OH, USA,
Chung, D.D.L. (2010). Composite Materials: Science and Applications, 2nd ed., Springer, Berlin.
Güzel, G. (2016). Preparation of epoxy resin-slag/groundnut hull composites and ınvestigation of properties, Master's Thesis, Selçuk University, Institute of Science and Technology, Konya, Turkey.
Ersoy, H.Y. (2001). Kompozit malzeme, Literatür Yayınları, No: 66, İstanbul, Türkiye.
ISO/DIS 13061-17 (2015). Test methods for small clear wood specimens-determination of ultimate stress in compression parallel to grain. International Organization for Standardization, Switzerland.
Kaw, A.K. (2005). Mechanics of composite materials. CRC Press, New York, USA.
Miyoshi, K. (2001). Solid Lubrication Fundamentals and Applications, CRC Press, New York, USA, p. 266.
Montero, B., Serra, A., Ramírez, C. & Ramis, X. (2013). Epoxy/anhydride networks modified with polyhedral oligomeric silsesquioxanes. Polymer Composites, 34(1), 96-108.
Nohales, A., Solar, L., Porcar, I., Vallo, C.I. & Gómez, C.M. (2006). Morphology, flexural, and thermal properties of sepiolite modified epoxy resins with different curing agents, European Polymer Journal, 42(11), 3093-3101.
Seyhan, A.T., Gojny, F.H., Tanoğlu, M. & Schulte, K. (2007). Critical aspects related to processing of carbon nanotube/unsaturated thermoset polyester nanocomposites. European Polymer Journal, 43(2), 374-379.
Sezgin, H. (2018). Investigation and enhancement of the mechnanical properties of the fabric reinforced hybrid composites. Ph.D. Thesis, İstanbul Technical University, Graduate School of Science Engineering and Technology, İstanbul, Turkey.
Sönmez, A. & Budakçı, M. (2004). Protective layers and paint/varnish systems, finishing on woodworking II., Gazi University, Technical Education Faculty, Sevgi Ofset, Ankara, Turkey. Şahmetlioğlu, E. (2000). Production of epoxy resins investigation and utilization of them as a binders and adhesives. Master's Thesis, Niğde University, Institute of Science and Technology, Niğde, Turkey.
Ting, T.H., Wang, T.M., Yang, S.F., Sun, K.S. &Lee, W.C. (2011). Effect of the water quenched slag‐epoxy resin composite on microwave absorbing properties. Journal of the Chinese Chemical Society, 58(1), 83-89.
TS 2470 (1976). Sampling methods and general requirements for physical and mechanical tests in wood. Turkish Standards Institution, Ankara, Turkey.
TS 2471 (1976). Determination of moisture content for physical and mechanical tests in wood. Turkish Standards Institution, Ankara, Turkey.
TS 2472 (1976). Determination of density for physical and mechanical tests in wood. Turkish Standards Institution, Ankara, Turkey.
TS 2474 (1976). Wood-determination of ultimate strength in static bending. Turkish Standards Institution, Ankara, Turkey.
Velde, B. (1992). Introduction to clay minerals, chemistry, origins, uses and environmental significane. 1 th Edition, Chapman & Hall Inc., London, Great Britain, pp. 10-15.
Web-1: http:// www.gncahsap.com, (22 June 2018).