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Title:	An investigation of factors affecting wettability of some southern hardwoods
Author(s):	Shupe, Todd F.; Hse, Chung Y.; Wang, Wan H.
Date:	1999
Source:	In: Christiansen, Alfred W.; Pilato, Louis A. International contributions to wood adhesion research; Proceedings no. 7267. Madison, WI: Forest Products Society: 132-136.
Station ID:	--
Description:	>Wettability of sanded and nonsanded transverse and tangential sections of 22 southern hardwood species were[was] judged by measurement of contact angles using phenol-formaldehyde resins. As ex­pected, contact angle values on transverse sec­tions were higher than on tangential sections for both sanded and nonsanded surfaces. On sanded surfaces, hackberry had the highest mean contact angle (64.7°), and black oak had the lowest mean contact angle (50. 1°). On nonsanded surfaces, winged elm had the highest mean contact angle (59. 1°), and sweetgum had the lowest mean con­tact angle (45.9°). In addition, 4 of the 22 species (southern red oak, sweetgum, white oak, and post oak) were selected to investigate the effect of ovendrying, air-drying, and freeze-drying on wetta­bility. The mean transverse contact angle was 2.1° to 29.0° and 5.1° to 31.5° higher than radial and tangential values, respectively. The contact angle pattern typically displayed for a given species and plane was generally ovendry > air-dry > freeze-dry. The species pattern for most drying methods and planes was: sweetgum > white oak > post oak > southern red oak. White oak and post oak gave similar contact angle values.
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