Effects of Polymer Impregnation on Properties of Bamboo



This research is targeted to investigate the effects of polymer impregnation on the properties of bamboo. Polymer impregnation can improve adhesion of flattened bamboo and also improve the resistance of polymer-impregnated bamboo to fungi. During the flattening bamboo process, linseed oil was used as a processing aid. Two different kinds of solvents, methanol and ethanol, were used to extract linseed oil. Weights of samples before and after extraction were compared. Ethanol is a better solvent than methanol to extract linseed oil since weight loss is higher. The flattened bamboo samples were adhered together by phenol-formaldehyde (PF) adhesive or polymeric diphenylmethane diisocyanate (MDI) adhesive. The adhesion test was performed in shear mode. Sample extracted with ethanol and adhered by MDI gave a maximum shear stress of 5.84 MPa while samples extracted with methanol and adhered by PF gave only 2.45 MPa. A higher percentage of wood failure was observed in samples with higher adhesion strength. In durability to fungi, a polymer-wood composite was made by impregnation of methyl methacrylate in the wood under vacuum. The composite showed better resistance to fungi, especially, in nodes. Nodes have a lower densities and less effective packing of fibers than internodes. Therefore monomers can diffuse into node and then polymerize. More polymer loading gives better durability to fungi.


Flattened bamboo, phenol-formaldehyde adhesive, diphenylmethane diisocyanate adhesive, polymer impregnation

Full Text:



SH Li, QY Zeng, YL Xiao, SY Fu and BL Zhou. Biomimicry of bamboo bast fiber with engineering composite materials, Mater. Sci. Eng. 1995; C3, 125-30.

S Amada, T Munekata, Y Nagase, Y Icchikawa, A Kirigai and Y Zhifei. The mechanical structures of bamboos in viewpoint of functionally gradient and composite materials, J. Composite Mat. 1996; 30, 800-19.

B Cherdchim, N Matan and B Kyokong. Effect of temperature on thermal softening of black-sweet bamboo culms (Dendrocalamus asper Becker) in linseed oil, Songklanakarin J. Sci. Technol. 2004; 26, 855-66.

AN Gent and GR Hamed. Fundamentals of Adhesion. In: I Skeist (ed). Handbook of Adhesives. 3rd ed. van Nostrand Rheinhold, New York, 1990, p. 39-73.

J Zheng. 2001, Fundamental Studies of Phenol-Formaldehyde (PF)/ Polymeric Diphenylmethane Diisocyanate (pMDI) Hybrid Adhesives, Ph.D. Dissertation. Virginia Polytechnic Institute and State University, USA.

RG Schmidt. 1998, Aspects of Wood Adhesion: Application of 13C CP/MAS NMR and Fracture Testing, Ph.D. Dissertation. Virginia Polytechnic Institute and State University, USA.

CE Frazier and J Ni. On the occurrence of network interpenetration in the wood-isocyanate adhesive interphase, Inter. J. Adhesion & Adhesives. 1998; 18, 81-7.

GR Hamed and W Preechatiwong. Peel strength of uncrosslinked styrene-butadiene rubber adhered to polyester film, J. Adhesion. 2003; 79, 327-48.

JA Mayer. Wood-Polymer Materials, In: RM Rowell (ed). The Chemistry of Solid Wood, American Chemical Society, 1984, p. 257-88.

MGS Yap, LHL Chia and SH Teoh. Wood-Polymer Composites from Tropical Hardwoods I. WPC Properties, J. Wood Chem. Technol. 1990; 10(1), 1-19.

ISO Standard 6237: 1987, Adhesive: Wood-to-Wood Adhesive Bonds: Determination of shear strength by tensile loading.


  • There are currently no refbacks.


Online ISSN: 2228-835X


Last updated: 12 August 2019