Abstract
Comparative study on weathering durability property of phenol formaldehyde resin modified sweetgum and southern pine specimens
Highlights
Southern pine (Pinus taeda) and sweetgum (Liquidambar styraciflua) are two of the most common wood species in the Southern of the United State of America (USA)
The water-repellent efficiency (WRE) of treated sweetgum were significantly higher than those of treated quarter-sawn and treated flat-sawn southern pine during accelerated weathering cycles correspondingly, and the coefficients of variance (COV) of treated sweetgum were all significantly smaller than the ones of treated quarter-sawn and treated flat-sawn southern pine, showing that sweetgum might result in a resin impregnated product with less variation
This was because much more molecular weight (MW) phenol formaldehyde (PF) resins penetrated into sweetgum specimens than into southern pine specimens
Summary
Southern pine (Pinus taeda) and sweetgum (Liquidambar styraciflua) are two of the most common wood species in the Southern of the United State of America (USA). The southern pine has the specific gravity of 0,53 with straight grain, has been widely used in engineered wood timber and composites, while sweetgum has specific gravity of 0,55 with interlocked grain which makes the wood deform and crack if not dried properly. Sweetgum is used principally for veneer, plywood, slack cooperage, fuel, pulpwood, boxes and crates (Forest Products Laboratory 2010). Some studies have been conducted using chemical modified methods and thermal heated methods to improve the wood weathering durability properties, such as water-repellent efficiency (WRE), dimensional stability, crack formation, as well as mechanical properties.
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