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°®ÓëÓêÏÂ: ½ð±Ò+1 2014-03-15 05:03:31
It can be seen from Figure4(a) and 4(b)that the lower the concentration of the modifier ??It can be seen from Figure4(a) and 4(b)that the lower concentration of the modifier
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ÕæÇ¿±ØÊ¤: ½ð±Ò+2, ÍÛÍÛÍÛ 2014-03-16 11:14:10
satanwy: ½ð±Ò+300, ·­ÒëEPI+1, ¡ï¡ï¡ï¡ï¡ï×î¼Ñ´ð°¸, лл£¡£¡£¡ 2014-03-17 08:47:22
MOR (static bending strength or modulus of rupture) £¬ MOE (modulus of elastic),
It can be seen from Figure4(a) and 4(b)that the lower the concentration of the modifier, the more reasonable the MOR and MOE  improvement  rate of different  tree height  positions . At high concentrations modifier (modifier concentration of 6%), the mechanical properties at different height  locations much obviously decreased. It might  be  that  low  concentration modifier  is difficult to   aggregate and cure  in wood pores and high concentration modifying agent is easily collected in the catheters and pores in a short time  , which solidified and clogged the modifier's  flow  to the direction of the treetop, thus affected the uniform distribution of modifiers  inside the standing tree and  the change rate of the MOR and MOE  .It  can also  be seen from Figure 4 (b) and 4 (c)that  with  the addition of polyethylene glycol, the change  rate of  MOR and MOE   at different height positions become  more uniform and less obvious . Where in  the bottom of the tree trunk and other locations ,the  rate of change has no significant decrement. While the mechanical strength  of the tree  trunk  has more significant improvement toward the treetop    than the bottom  after the polyethylene glycol  was added to . It might be that the added polyethylene glycol, as a surfactant, can effectively diffuse the modifier inside the trunk. So it is not easy for the modifier to aggregate in the pores and catheter and cure. The upper blocked modifier diffusion promoted modifier enrichment in the upper tree trunk in the process of modification so that the change rate of MOR and MOE of greater tree height is much greater.
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