中文摘要：

采用普通研磨和液氮研磨两种方法对桉树木材进行研磨,用光学显微镜测量研磨后的木粉颗粒长度,用XRD测量木粉相对结晶度。结果表明：两种研磨条件下,随着研磨时间延长,木粉颗粒长度都有减小的趋势,且采用液氮研磨时木粉颗粒平均长度小于普通研磨的木粉颗粒平均长度;另外,两种研磨条件下木粉颗粒长度的变异系数都较大,但普通研磨时随着时间延长变异系数有下降趋势,而液氮研磨时没有明显规律。两种研磨条件下,随着研磨时间延长,木粉相对结晶度都呈现出减小的趋势,且在研磨时间为0-30 min,相同研磨时间,普通研磨的木粉相对结晶度低于液氮研磨的木粉相对结晶度;在研磨时间超过30 min以后,普通研磨和液氮研磨的木粉相对结晶度趋于一致。通过液氮研磨的方法,能有效改善桉树木粉的颗粒长度,且在一定时间内对其相对结晶度的改变较小。

英文摘要：

Particle length and relative crystallinity of eucalyptus powder obtained by common milling and liquid nitrogen milling were measured by light microscope and XRD. The results showed that the particle length of eucalyptus powder was decreased with increasing of milling time,and the average length of eucalyptus powder with liquid nitrogen milling was smaller. In addition,coefficient variation of particle length in eucalyptus powder was large under the two different milling conditions,and the coefficient variation of powder obtained by common milling was decreased with increasing of milling time,but there was no abvious regularity when the powder was obtained with liquid nitrogen milling. On the other hand,relative crystallinity of eucalyptus powder was decreased with extending milling time under the two different milling conditions. Moreover,relative crystallinity of eucalyptus powder with common milling was smaller in the first 30 minutes under the same milling time,but relative crystallinity of eucalyptus powder with common milling and liquid nitrogen milling were similar after 30 minutes. Particle length of eucalyptus powder could be improved extremely with liquid nitrogen milling,and relative crystallinity of it was changed very few in a certain period of some time.