Abstract
Hardwood hemicellulose extracts can be used as a feed stock for ethanol plants or for renewable polymer applications. Extraction of Acer rubrum wood strands with water at 160°C and for 90 minutes removed approximately 16% of the wood weight. The extract was composed primarily of acetylated glucuronoxylans (63.9%) and lignin (17.6%). The dispersive surface energy and acid-base surface characteristics for a multi-component freeze dried mixture of hot water extracted Acer rubrum components was determined by inverse gas chromatography (IGC). The dispersive surface energy of the extract was found to be non-sensitive to thermal variations and has a magnitude of 34.6 ± 0.2 mJ/m2 with a K a of 0.13 and K b of 0.46. The maple wood had a regressed surface energy of 42.7 mJ/m2 at 20°C following extraction, and the surface energy before extraction was 40.4 mJ/m2 at 20°C. Also, before extraction the K a and K b of the red maple were 0.19, 0.92, respectively, and after extraction the K a and K b were 0.15 and 1.17. Infrared spectroscopy (IR) was used to characterize the wood surfaces and the IR data correlated to the surface energy values. These findings indicate that the hemicellulose-extract components influence the overall average surface energy of maple wood by lowering the surface energy relative to other surface components.
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