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Effect of post treatment temperature and humidity conditions onfixation performance of CCA-C treated red pine and southern pine

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Journal of Forestry Research 1999年第3期10卷 141-146页

作者：郭爱龙 P.A.Cooper Faculty of Forestry University of Toronto Earth Science Center 33 Willcocks Street Toronto Ontario Canada M59 3B3

Rates of fixation in chromated copper arsenate (CCA-C) treated red pine (Pinus resinosa Ait.) and southern pine (Pinus spp) sapwood specimens using retention of 1.5, 2.0, 6.4 kg·m?3 are compared at temperature (T) ranging from 70°C to 50°C and 5 different relative humidity (RH) conditions. The samples were investigated using the expressate method to follow chromium fixation. Red pine fixes faster than southern pine under all 11 post treatment schedules. The fixation rates for both species are not significantly different while the blocks were fixed under 6 fixation/drying schedules that differed only in the order of T/RH conditions applied. The rate of fixation of all samples in any fixation stage were reduced when the blocks were fixed under lower humidity conditions in spite of no change in chamber temperature. Some of this influence can be attributed to the effect of humidity on heat transfer into the wood and cooling of the wood surface.

关键词： CCA-c Fixation Post treatment Temperature Relative humidity Red pine southern pine

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Effects of Fixation Drying Conditions on Fixation Rate and Leachability in CCA-C Treated Red pine and southern pine

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Forestry Studies in China 2001年第1期3卷 50-57页

作者：郭爱龙 P.A.Cooper T.Y.Ung 内蒙古农业大学呼和浩特010019 加拿大多伦多大学林学院

The effects of fixation drying conditions on fixation rates and chemical leachab ility were investigated with CCA-C treated red pine (Pinus koraiensis Sieb. )and southern pine specimens at a retention of 6 4 kg·m -3 , and under 11 post-treatment schedules ra ng ing from 50～70℃ and 5 different relative humidity conditions. These samples w e re monitored by expressing residual liquid and analyzing it for hexavatent chrom ium content. Samples were subjected to AWPA E11-97 (AWPA 1997) standard leachi n g tests after fixation. Generally, red pine fixed slightly faster than southern pine for most fixation conditions. High temperature, high humidity, fixation co nditions during the fixation/drying schedules resulted in faster fixation and lo wer leaching of chromium and arsenic elements compared to low humidity condition s. Copper leaching showed no significant difference under 11 fixation /drying co nditions for both species. All of the CCA components were leached significantly more in red pine than southern pine. Further work is needed to examine the effec ts of different fixation/drying conditions on leaching from full\|size samples a n d to optimize dry/wet bulb depression for fixation/drying of CCA treated lumber.

关键词： CCA-C fixation leaching red pine southern pine post-treatment schedule

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Preparation and Characterization of Polyurethane Foams from Biomass-Based Polyols Obtained by Microwave-Assistant Liquefaction of Wood

Preparation and Characterization of Polyurethane Foams from ...

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第二届中国林业学术大会——S11木材及生物质资源高效...

作者：郑志锋 Chung Y.Hse Key Laboratory of Protection Cultivation and Utilization of Forest Resource in Southwest Country Cooperated by Ministry of Education with Yunnan ProvinceSouthwest Forestry University southern Research Station USDA Forest ServicePinevilleLouisiana 71360USA

Polyurethane foams were prepared from the liquefied wood polyols, which was obtained by the liquefaction of southern pine wood in the presence of polyhydric alcohols using microwave-assistant as an energy source. The effects of acid type （sulfuric acid and phosphoric acid） and liquefaction reaction time on the properties of liquefied biomass-based polyols were investigated. The influences of isocyanate index on the properties of polyurethane foams were also discussed, and feasible formulations for preparing liquefied biomass-based polyurethane foams were proposed. The results indicated that the foams prepared from such liquefied wood polyols obtained by microwave-assistant liquefaction exhibited excellent mechanical properties.

关键词： polyurethane foam liquefaction microwave southern pine mechanical properties

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