【摘要】 用SEM、XRD和偏光显微镜研究了软木纤维素的形态、结构以及针叶木浆板的硝化反应性能。结果表明,软木纤维素比棉纤维素的结晶度低,木浆纤维结构更加疏松;不同硝化试剂在木浆板中的扩散速度不同,CH2Cl2-HNO3硝化剂在木桨板中的扩散速度更快;木浆板在CH2Cl2-HNO3中的反应是二级反应,40min是适宜的反应时间;硝化反应分为两个阶段,且有各自的反应速率常数,第一阶段反应速率常数比第二阶段高两个数量级。更多还原

【Abstract】 The morphology and aggregated structure of soft pulp and the nitration of soft wood pulp board were investigated by SEM,XRD and micropolariscope.The results show that the soft wood pulp has lower crystallinity and looser morphology than refined cotton.Diffusion rate of different nitration reagent to soft wood pulp board is various.Compared with HNO3-H2SO4-H2O mixture,the diffusion rate of HNO3-CH2Cl2 mixture is fast.The reaction of soft wood pulp board with HNO3-CH2Cl2 is a second order reaction.The homogeneity and nitrogen content of product increase with the increase of time,considering that 40 minutes is appropriate reaction time.The nitration reaction contains two steps and each step has its own rate constant.The first rate constant is about two-order of magnitude larger than the second one.更多还原