Sains Malaysiana 43(5)(2014): 775–782

Response Surface Methodology Models of Processing Parameters for

High Performance Phenolic Compreg Wood

(Model Kaedah Permukaan Respons bagi Parameter Pemprosesan untuk Kayu Fenolik Termampat Berprestasi Tinggi)

A.    ZAIDON*¹, G.H. KIM², E.S. BAKAR³& H. RASMINA¹

¹Faculty of Forestry, Universiti Putra Malaysia, 43400 Serdang, Selangor D.E.

Malaysia

²Division of Environmental Science and Ecological Engineering, Korea University

Seoul 136-713, Korea

³Institute of Tropical Forestry and Forest Products, Universiti Putra Malaysia

43400 Serdang, Selangor D.E. Malaysia

Diserahkan: 30 Mei 2013/Diterima: 3 September 2013

ABSTRACT

The aim of the study was to develop response surface methodology (RSM) models for polymer loading, density, dimensional stability, strength and stiffness of compressed wood of sesenduk (Endospermum diadenum) treated with phenol formaldehyde (PF). Central composite design (CCD) using RSM with three processing parameters was studied in their specific ranges: PF concentration (PC) from 24-40%, pre-curing time (PCT), 3-9 h and compression ratio (CR), 70-90%. The experimental design was analysed and interpreted using the Design Expert Software (Stat Ease version 8) and the responses of 3d plots were built using the same software. Quadratic models in terms of PC, PCT and CR were developed for polymer loading, density, reduction in water absorption and modulus of rupture in static bending. Multiple linear equations were developed for anti-swelling efficiency and modulus of elasticity. The experimental values were in good agreement with predicted ones and the models were highly significant with correlation coefficients between 0.626 and 0.926. PC and CR had significant effects on the responses. The range of PCT used did not significantly affect the responses. It was also found that the improvement of properties ranged from moderately to highly correlated with the polymer loading in the compreg wood.

Keywords: Central composite design; compreg; phenol formaldehyde

ABSTRAK

Tujuan kajian ini adalah untuk membangunkan model kaedah permukaan respons (RSM) untuk ketahanan polimer, ketumpatan, kestabilan dimensi, kekuatan dan keanjalan kayu sesenduk (Endospermum diadenum) termampat (Compreg) yang dirawat dengan fenol formaldehid (PF). Reka bentuk komposit tengah (CCD) menggunakan RSM dengan tiga parameter pemprosesan dikaji dalam julat kepekatan PF (PC) 24-40%, masa pra-pematangan (PCT), 3-9 jam dan nisbah mampatan (CR), 70-90%. Reka bentuk ujian dianalisis dan ditafsirkan menggunakan perisian Design Expert (Stat Ease version 8) dan plot respons 3d dihasilkan dengan menggunakan perisian yang sama. Model kuadratik dibangunkan untuk ketahanan polimer, ketumpatan, pengurangan penyerapan air dan modulus kepecahan dalam lenturan statik berdasarkan PC, PCT dan CR. Persamaan linear berganda dibangunkan untuk keberkesanan anti-pembekaan dan modulus kekenyalan. Nilai yang diperoleh daripada ujian mempunyai persamaan dengan nilai yang diramalkan dan model yang dihasilkan mempunyai kesan yang ketara dengan pekali korelasi antara 0.626 dan 0.926. PC dan CR mempunyai kesan yang besar ke atas respons. Julat PCT yang digunakan tidak memberi kesan ketara kepada respons. Kajian ini juga mendapati peningkatan sifat kayu berkait rapat dengan ketahanan polimer dalam kayu compreg dalam skala sederhana ke tahap tinggi.

Kata kunci: Compreg; fenol formaldehid; reka bentuk komposit tengah

RUJUKAN

Ashaari, Z., Barnes, H.M., Vasisth, R.C., Nicholas, D.D. & Lyon D.E. 1990. Effect of aqueous polymer treatments on properties. Part I: Mechanical properties. IRG/WP/3610.

BSI (British Standard Institute). 1957. BS 373. Methods of Testing Small Clear Specimens of Timber. London: British Standard Institution.

Ceylan, H., Kubilay, S., Aktas, N. & Sahiner, N. 2008. An approach for prediction of optimum reaction conditions for laccase-catalysed bio-transformation of 1-nalphtol by response surface methodology (RSM). Bioresource Technology 99: 2025-2031.

Collins, P.J. 1996. Current research activities on wood adhesives at CSIRO. 25th Forest Research Conference, 18–21 November 1996, Victoria, Australia.

Inoue, M., Norimoto, M., Otsuka, Y. & Yamada, T. 1991. Surface compression of coniferous lumber III. Permanent set of the surface compression layer by water solution low molecular weight phenolic resin. Mokuzai Gakkaishi 37(30): 234-240.

Li, X., Li, Y., Zhong, Z, Wang, D., Ratto, J.A., Sheng, K. & Sun, X.S. 2009. Mechanical and water soaking properties of medium density fiberboard with wood fiber and soybean protein adhesive. Bioresource Technol. 100: 3556-3562.

Myers, R.H. & Montgomery, D.C. 2002. Response Surface Methodology. New York: John Willey & Sons.

Rabia’tol Adawiah, M.A., Zaidon, A., Nurizreen, F.A., Bakar, E.S., Mohd Hamami, S. & Paridah, M.T. 2012. Addition of urea as formaldehyde scavenger for low molecular weight phenol formaldehyde treated compreg wood. Journal of Tropical Forest Science 24(3): 265-274.

Roriz, M.S., Osma, J.F., Teixeira, J.A. & Couto, S.R. 2009. Application of response surface methodological approach to optimize reactive black 5 decolouration by crude laccase from Trametes pubescens. Journal of Hazardous Materials 169: 691-696.

Rowell, R.M. & Konkol, P. 1987. Treatments that enhance physical properties of wood. Gen. Tech. Rep. FPL-GTR-55. U.S. Department of Agriculture, Forest Service, Forest Product Laboratory. Madison.

Rowell, R.M. 2005. Chemical modification of wood. In Handbook of Wood Chemistry and Wood Composites, edited by Rowell, R.M. Florida: CRC Press.

Shams, M.I. & Yano, H. 2004. Compressive deformation of wood impregnated with low molecular weight phenol formaldehyde (PF) resin II; effects of processing parameters. J. Wood Sci. 50: 343-350.

Shams, M.I. & Yano, H. 2011. Compressive deformation of phenol formaldehyde (PF) resin-impregnated wood related to the molecular weight of resin. Wood Sci. Tech. 45: 73-81.

Wang, K. & Lam, F. 1999. Quadratic RSM models of processing parameters for three-layer oriented flakeboards. Wood Fiber Sci. 31: 173-186.

Yano, H., Hirose, A., Collings, P.J. & Yazaki, Y. 2001. Effects of matrix substances as a pretreatment in the production of high strength resin-impregnated wood based materials. Journal of Material Science Letters 20: 1125-1126.

Zaidon, A. 2009. Improvement of raw materials from underutilised timber species through chemical and densification treatments for value added laminated products. End of Reports submitted to the Ministry of Science and Technology, Malaysia. Report No. 06-01-04-SF0656 (unpublished).

Zaidon, A., Kim, G.H., Paridah, M.T., Bakar, E.S. & Rushdan, I. 2012. Optimisation of the processing variables in gaining high polymer loading in compressed wood using response surface methodology (RSM). Journal of Tropical Forest Science 24(2): 241-248.

*Pengarang untuk surat-menyurat; email: zaidon@upm.edu.my