Modification of Paulownia wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and its effect on selected Strength Properties

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REZVANI M.H.; TALAEI A.; Rajabi Cham Heidari H.

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Journal: Iranian Journal of Wood and Paper Science Research Year:2017 | Volume:32 | Issue:3 (60) Page(s): 436-449

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Title

Modification of Paulownia wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and its effect on selected Strength Properties

Author(s)

REZVANI M.H. | TALAEI A. | Rajabi Cham Heidari H. | Issue Writer Certificate

Keywords

Physical propertiesQ2

Polycrease ECR (mDMDHEU)Q1

Cell Wall WPCQ1

water absorptionQ2

bulking efficiencyQ1

Abstract

One of the main strategies to develop the extent of wood modification is using active functional groups in wood structure by impregnation with modified N-methylol compound. The aim of this study was to evaluate the Physical properties of paulownia wood after modify with Polycrease ECR Cell wall resin, name modified dimethylol-dihydroxyethyleneurea (mDMDHEU). Physical test samples were prepared according to ASTM and EN standard and treated with pressure vessel method at two concentration levels; 15 and 25 percent of soluble resin. For polymerization, treated samples were heated in oven for 24-hour periods at 145 and 155 º C respectively. Weight percent gain (WPG), bulking, water soaking, swelling, antiswelling efficiency (ASE), leaching and contact angle were determined. High mDMDHEU concentration increased the weight gain and cell wall bulking. Highest weight percent gain (10. 70%) and bulking efficiency (6. 85%) in to levels of 25% were determined at 155 ˚ C. In comparison with the unmodified wood, the mDMDHEU modified wood due to absorbed polymer exhibited improved dimensional stability and reduced water uptake, and maximum dimensional stability were determined in samples modified using by 25% mDMDHEU containing solutions and curing temperature 155 º C. Moreover, mDMDHEU treatment was resistant to leaching. Contact angle measurement further confirmed the improved hydrophobicity of wood after modification. Modification with mDMDHEU significantly improved the Physical properties. The improve of the resistance of chemically modified wood can be attributed to the reduction of wood moisture, bulking of cell walls and cell cavities blocking affect to dominant reactivity mDMDHEU with cell wall wood polymer.

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APA: Copy

REZVANI, M.H., TALAEI, A., & Rajabi Cham Heidari, H.. (2017). Modification of Paulownia wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and its effect on selected Strength Properties. IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH, 32(3 (60) ), 436-449. SID. https://sid.ir/paper/109941/en

Vancouver: Copy

REZVANI M.H., TALAEI A., Rajabi Cham Heidari H.. Modification of Paulownia wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and its effect on selected Strength Properties. IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH[Internet]. 2017;32(3 (60) ):436-449. Available from: https://sid.ir/paper/109941/en

IEEE: Copy

M.H. REZVANI, A. TALAEI, and H. Rajabi Cham Heidari, “Modification of Paulownia wood with methylolated dimethyloldihydroxyethylenurea (mDMDHEU) and its effect on selected Strength Properties,” IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH, vol. 32, no. 3 (60) , pp. 436–449, 2017, [Online]. Available: https://sid.ir/paper/109941/en

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