泡桐和毛白杨的pH值与酸碱缓冲容量

The pH and Acid-Alkali Buffering Capacity of Paulownia tomentosa and Populus tomentosa

实测了河南巩义产泡桐和毛白杨木材的化学成分;分析了这两种速生材的pH值、酸碱缓冲容量及其对脲醛树脂胶凝胶时间的影响,同时与北京产的毛白杨作了相应性质的对比.研究结果表明,泡桐材的各种溶液抽出物的含量均较高;三个树种的pH值范围为5.19～6.28,为弱酸性;北京毛白杨的边、心材的酸缓冲容量存在较大差异;三个树种对脲醛树脂胶凝胶时间的影响程度基本是相同的.

The chemical components of wood for species of Paulownia tomentosa and Pop- ulus tomentosa growing in Gongyi county,Henan province were measured.The pH and acid- alkali buffering capacity of the species and the influence on the coagulation time for UF resin of them were analyzed.Meanwhile,their relative properties were contrasted with Populus tomentosa growing in Beijing.The results showed that.①There were more extractions with various solutions for Paulownia tomentosa than for others.②The wood of these three species showed a weak aid property,pH was 5.19～6.28.There was significant difference in acid- alkali buffering capacity between the sapwood and the heart wood for Populus tomentosa grow in Beijing.③Basically,the influence on the coagulation time for UF resin of these three species was the same.