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Paper Information

Journal:   IRANIAN JOURNAL OF WOOD AND PAPER SCIENCE RESEARCH   FALL 2017 , Volume 32 , Number 3 (60) ; Page(s) 436 To 449.
 
Paper: 

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.
 
* Wood Science and Technology Department, Faculty of Civil Engineering, Shahid Rajaee Teacher Training University, Tehran, Iran
 
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.
 
Keyword(s): Physical properties,Polycrease ECR (mDMDHEU),Cell Wall WPC,water absorption,bulking efficiency
 
 
References: 
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Click to Cite.
APA: Copy

REZVANI, M., & 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. https://www.sid.ir/en/journal/ViewPaper.aspx?id=665821



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. 2017 [cited 2021May12];32(3 (60) ):436-449. Available from: https://www.sid.ir/en/journal/ViewPaper.aspx?id=665821



IEEE: Copy

REZVANI, M., 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, [online] 32(3 (60) ), pp.436-449. Available: https://www.sid.ir/en/journal/ViewPaper.aspx?id=665821.



 
 
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