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SURFACE CHARACTERIZATION OF RED MAPLE STRANDS AFTER HOT WATER EXTRACTION

机译：热水提取后红苹果树的表面特性

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The conversion of carbohydrates from wood to make biofuels such as ethanol is a topic of widespread interest. A promising approach is the removal of the hemicellulosic wood component by extraction with subsequent conversion to biofuels while continuing to produce forest products. The impact of extraction on wood strands for use in strand-based composites was investigated. One tree of red maple (Acer rubrum L.) was used to create strands 10.2 cm long with a thickness of 0.9 mm. Three hot water extraction procedures at 160°C, corresponding to severity factors (SF) of 2.71, 3.54, and 3.81, were used resulting in an average weight loss of 5.7, 16.9 and 18.1%, respectively. Scanning electron microscopic imaging of selected wood strands showed that poresin the cell wall increased as SF increased. The distribution and size of the cell-wall pore structure showed up to a 22.2% increase. The sessile drop method, using distilled water, diiodomethane, and ethylene glycol, indicated more pronounced liquid wetting and penetration as SF increased. Inverse gas chromatography led to the finding that dispersive surface-free energy and acid-base characteristics increase with SF. The extraction procedures should be kept below a SF of 3.54 to minimize changes in adhesion performance.
机译：碳水化合物从木材中转化为生物燃料（例如乙醇）的过程已引起广泛关注。一种有前途的方法是通过提取除去半纤维素木材成分，随后转化为生物燃料，同时继续生产林产品。研究了提取对用于基于线的复合材料的木线的影响。用一棵红枫树（Acer rubrum L.）制作长10.2 cm的线，厚度为0.9 mm。在160°C下使用三种热水提取程序，分别对应于严重度因子（SF）为2.71、3.54和3.81，分别导致平均失重5.7％，16.9％和18.1％。选定木条的扫描电子显微镜成像显示，随着SF的增加，细胞壁中的孔增加。细胞壁孔结构的分布和大小显示增加了22.2％。使用蒸馏水，二碘甲烷和乙二醇的无滴法表明，随着SF的增加，液体的润湿性和渗透性会更加明显。反相气相色谱法导致发现分散表面自由能和酸碱特性随SF的增加而增加。提取程序应保持在3.54的SF以下，以最大程度地减少粘附性能的变化。

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