-KAPROLAKTON İLE KİMYASAL MODİFİYE EDİLEN AHŞAP MALZEMELERİN TERMAL KARAKTERİZASYONU

Öz

Yenilenebilir biyobozunur yeşil biyomalzeme olarak ahşap malzemeler birçok uygulama alanında kullanılmaktadır. Bunlara örnek olarak; mobilya, kompozit malzemeler, konstrüksiyon, iç mimari uygulamalar, yapı vb. verilebilir. Pozitif özelliklerinin yanında ahşap malzeme bazı dezavantaj sayılabilecek özellikleri de bünyesinde barındırmaktadır. Bunlar düşük boyutsal stabilite ve biyolojik dayanımdır. Arzu edilmeyen bu özellikler ahşap malzemelerin potansiyel uygulama alanlarını kısıtlamaktadır. Ahşap malzemelerin son kullanım performans özelliklerini geliştirmek için çeşitli modifikasyon yöntemleri geliştirilmiştir. Bu bilimsel çalışmada, çeşitli ahşap malzemeler en çok gelecek vadeden sentetik biyobozunur polimerlerden birisi olan poli(ε-kaprolakton) (PCL) ile kimyasal olarak modifiye edilmiştir. Ahşap malzemelerin termal karakteristiklerini ortaya koymak için dinamik mekanik termal analizler (DMTA) ile termogravimetrik analizler (TGA) gerçekleştirilmiştir. DMTA ile ahşap malzemelerin storage modulus ve loss modulus değerleri belirlenirken, TGA ile termal stabilitesi ve ağırlık kayıpları tespit edilmiştir. Bu araştırma sonucu elde edilen veriler göstermiştir ki, PCL ile yapılan kimyasal modifikasyon ahşap malzemelerin termal özelliklerini etkilemiştir.

Anahtar Kelimeler

• Termal analizler,DMTA,TGA,poli(ε-kaprolakton) (PCL),ahşap malzeme,kimyasal modifikasyon

THERMAL CHARACTERIZATION OF CHEMICALLY MODIFIED WOOD MATERIALS BY ε-CAPROLACTONE

Abstract

Wood materials as renewable biodegradable green biomaterials are used in many applications such as furniture, composite materials, construction, interior design, building etc. However, wood materials have some disadvantageous which are low dimensional stability and biological resistance. These undesired properties restrict end-use potential of wood materials. Various modification techniques have been developed to enhance its end-use performance properties. In this work, wood materials were chemically modified with poly(ε-caprolactone) (PCL) which is one of the most promising synthetic biodegradable polymers. Dynamic mechanical thermal analysis (DMTA) and thermogravimetric analysis (TGA) were carried out to evaluate thermal characteristics of the wood materials. Storage modulus and loss modulus values were determined with DMTA, while thermal stability and weight loss were studied with TGA. The findings of this present work showed that the chemical modification of the wood materials by PCL affected the thermal characteristics.

Keywords

• Thermal analysis,DMTA,TGA,poly(ε-caprolactone) (PCL),wood material,chemical modification

Kaynakça

1. [1]. Hill, C.A.S., (2006). Wood Modification: Chemical, Thermal and Other Processes, Wiley Series In Renewable Resources, John Wiley & Sons, Chichester, England. [2]. Norimoto, M. and Gril, J., (1993). Structure and Properties of Chemically Treated Woods. In: Recent Research on Wood and Wood-based Materials, Shiraishi, N., Kajita, H. and Norimoto, M. (Eds.). Elsevier, Barking, UK. [3]. Rowell, R.M., (1983). Chemical modification of wood. Forest Products Abstracts 6(12): 363 – 382. [4]. Kumar, S., (1994). Chemical modification of wood. Wood and Fiber Science 26(2): 270 – 280. [5]. Militz, H., Beckers, E.P.J., Homan, W.J., (1997). Modification of solid wood: research and practical potential. In: International Research Group on Wood Preservation, 28th Annual Meeting, Vancouver, Canada. [6]. Roussel, C., Marchetti, V., Lemor, A., Wozniak, E., Loubinoux, B., Gérardin, P. 2001. Chemical modification of wood by polyglycerol/maleic anhydride treatment. Holzforschung 55: 57 – 62. [7]. Rowell R.M., (2005). Handbook of Wood Chemistry and Wood Composites, CRC Press, Boca Raton, Florida, USA. [8]. Rowell, R.M., (2006). Chemical modification of wood: A short review. Wood Material Science & Engineering 1(1): 29 – 33. [9]. Militz, H., Lande, S., (2009). Challenges in wood modification technology on the way to practical applications. Wood Material Science and Engineering 4(1/2): 23 – 29. [10]. Mattos, B.D., Lourencon, T.V., Serrano, L., Labidi, J., Gatto, D.A. (2015). Chemical modification of fast-growing eucalyptus wood. Wood Science and Technology 49(2): 273 – 288. [11]. Gerardin, P., (2016). New alternatives for wood preservation based on thermal and chemical modification of wood – a review. Annals of Forest Science 73: 559 – 570. [12]. Mantanis, G.I., (2017). Chemical modification of wood by acetylation or furfurylation: a review of the present scaled-up technologies. BioResources 12(2): 4478 – 4489. [13]. Persson, P., [2004]. Strategies for cellulose fiber modification. PhD Thesis, KTH The Royal Institute of Technology, Sweden. [14]. Braganca, F.C., Rosa, D.S., (2003). Thermal, mechanical and morphological analysis of poly(ε-caprolactone), cellulose acetate and their blends. Polymers for Advanced Technologies 14: 669 – 675. [15]. Xu, Y., Wang, C., Stark, N.M., Cai, Z., Chu, C., (2012). Miscibility and thermal behavior of poly (-caprolactone)/long-chain ester of cellulose blends. Carbohydrate Polymers 88: 422 – 427. [16]. Ermeydan, M.A., Cabane, E., Hass, P., Koetz, J., and Burgert, I. (2014). Fully biodegradable modification of wood for improvement of dimensional stability and water absorption properties by poly(ε-caprolactone) grafting into the cell walls, Green Chemistry, 16, 3313-3321. [17]. Ermeydan, M.A., [2016], Chemical modification of spruce wood with combination of mesyl chloride and poly(ε-caprolactone) for improvement of dimensional stability and water absorption properties. Kastamonu University Journal of Forestry Faculty 16(2):541 – 552. [18]. Candan, Z., Yildirim, M., Satir, A., Ermeydan, M.A., Gonultas, O., [2017]. Hydrophobicity of ε-caprolactone-modified wood materials. COST Action FP1407 3rd Conference: Wood Modification Research and Applications, Co-organized with Society of Wood Science and Technology & The European Conference of Wood modification. September 13 – 15, 2017, Austria.