北京林业大学学报2011，Vol.33Issue(2)：91-95,5.
不同干燥预处理对杨木应拉木孔隙结构的影响
Effects of different drying pretreatments on pore structure of poplar tension wood.
摘要
Abstract
In order to compare the effects of different drying pretreatments( CO2 supercritical drying, freeze drying and conventional drying) on pore structure of poplar tension wood, deformations of specimens before and after drying as well as nitrogen adsorption isotherms were measured, which would be expected to provide a theoretical basis for the quantitative characterization of micro-pore structure of tension wood. The results showed that poplar tension wood under CO2 supercritical drying had intact mesoporosity( pore size 2 - 50 nm). BET specific surface area and mesopore volumn were much higher than those of samples under freeze drying and conventional drying. Freeze drying and conventional drying could cause significant shrinkage deformations of specimens in longitudinal and tangential directions, while CO2 supercritical drying could retain the porous texture quite intact by avoiding the pore collapse phenomenon induced by interface tension. CO2 supercritical drying is suggested to be the best drying pretreatment to characterize the pore structure of tension wood.关键词
应拉木/孔隙结构/氮气吸附法/CO2超临界干燥/冷冻干燥/常规干燥Key words
tension wood/ pore structure/ nitrogen adsorption method/ CO2 supercritical drying/ freeze drying/ conventional drying分类
农业科技引用本文复制引用
苌姗姗,胡进波,赵广杰..不同干燥预处理对杨木应拉木孔隙结构的影响[J].北京林业大学学报,2011,33(2):91-95,5.基金项目
中南林业科技大学引进高层次人才科研启动基金项目(1040110)、湖南省教育厅资助科研项目(09C1007)、中南林业科技大学青年基金项目(2008030B). （1040110）
