Influence of hot water extraction on cell wall and OSB strand mechanics

Paredes J. J.; Shaler S.; Howell C.; Jakes J.

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Influence of hot water extraction on cell wall and OSB strand mechanics

机译：热水提取对细胞壁和OSB股力学的影响

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The exposure of wood to elevated temperatures during hot water extraction (HWE) has been shown to significantly influence a variety of physical and chemical properties of the wood. Aspen (Populus tremuloides) and hemlock (Tsuga canadensis) strands underwent HWE at 160 A degrees C for four different periods of time. The weight loss (WL) associated with the processes ranged from 2.9 to 17.3% for the aspen, and from 2.9 to 12.8% for the hemlock. The higher WL associated with the hardwood was attributed to higher hemicellulose content in the hardwood than in the softwood as well as differences in chemical composition. Substantial increases in cell wall hardness (up to 34%) and modulus of elasticity (MOE) (up to 28%) were obtained at the intermediate extraction conditions. Extended exposure conditions resulted in decreases. The axial MOE of strands showed significant differences only in aspen. These changes are hypothesized to be related, in part, to changes in cellulose crystallinity.

机译：木材在热水提取（HWE）过程中暴露于高温下已显示出对木材各种物理和化学性质的显着影响。白杨（Populus tremuloides）和铁杉（Tsuga canadensis）链在160 A摄氏度下经过四个不同的时间进行HWE。与工艺相关的重量损失（WL）对于白杨为2.9％至17.3％，而对于铁杉为2.9％至12.8％。与硬木相关的WL较高是由于硬木中的半纤维素含量高于软木中的半纤维素含量，以及化学成分的差异。在中间提取条件下，细胞壁硬度（高达34％）和弹性模量（MOE）（高达28％）得到了大幅提高。延长暴露条件导致减少。线的轴向MOE仅在白杨中显示出显着差异。假设这些变化部分与纤维素结晶度的变化有关。

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《Wood Science and Technology》 |2017年第6期|1307-1319|共13页
作者
Paredes J. J.; Shaler S.; Howell C.; Jakes J.;
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Univ Tecnol Cent Amer UNITEC, Tegucigalpa, Honduras;

Univ Maine, Sch Forest Resources, Adv Struct & Composites Ctr, Orono, ME 04469 USA;

Harvard Univ, Cambridge, MA 02138 USA;

USDA Forest Serv, Forest Prod Lab, Madison, WI 53726 USA;

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Influence of hot water extraction on cell wall and OSB strand mechanics

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