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Scientia Silvae Sinicae ›› 2014, Vol. 50 ›› Issue (11): 109-114.doi: 10.11707/j.1001-7488.20141115

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Process of Wood High-Intensity Microwave Pretreatment Based on Response Surface Methodology

Xu Kang1,2, Lü Jianxiong1,2, Li Xianjun1, Wu Yiqiang1, Liu Yuan1   

  1. 1. School of Material Science and Engineering, Central South University of Forestry and Technology Changsha 410004;
    2. Research Institute of Wood Industry, CAF Beijing 100091
  • Received:2013-11-25 Revised:2014-03-11 Online:2014-11-25 Published:2014-12-04

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Abstract:

The poplar (Populus deltoides cv.I-69/55) wood was treated by high-intensity microwave pretreatment with microwave equipment under different initial wood moisture content, microwave radiation power and microwave radiation time. The results showed the transverse permeability of the poplar wood can be significantly increased by the microwave pretreatment; the wood permeability increased at first and then decreased with increased initial wood moisture content, and which increased with the increase of microwave radiation power and radiation time. Compared with the control group, the 24 h water absorption at atmospheric pressure of microwave pretreated wood simple was increased by around 50%, and the reasonable parameters range for initial wood moisture content, radiation power and radiation time were 25%-65%, 10-20 kW and 60-90 s, respectively. The optimal condition for microwave pretreatment was 56%, 19 kW and 89 s for initial wood moisture content, radiation power and radiation time, respectively. This appropriate microwave pretreatment generates high internal steam pressure, resulting in the rupturing of wood cell pore membranes and ray cells. Therefore, the great increase of permeability in the radial and longitudinal direction can be achieved and created favorable conditions for the fabrication of high value-added functional wood based composites materials.

Key words: poplar, high-intensity microwave, pretreatment, permeability, response surface methodology

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