Abstract: Microcrystalline cellulose PH-101 was dissolved by the ionic liquid 1-butyl-3-methylimidazolium chloride ([Bmim]Cl). Two kinds of regenerated cellulose with lower crystallinity (C1 and C2) were obtained by different regeneration methods. XRD was used to determine crystallinity of materials, thermogravimetric (TG) was used to determine thermal stability, and scanning electron microscopy (SEM) was used to observe the difference of morphology. The effect of crystallinity on pyrolysis characteristics of cellulose was obtained by analyzing the pyrolysis products from the cellulose with different degrees of crystallinity. Py-GC/MS results showed that the cellulose with lower degree of crystallinity had lower levoglucosan yield but higher yield of small molecule components.

Key words: cellulose, crystallization, crystallinity, ionic liquids, pyrolysis, pyrolysis characteristics

摘要： 利用离子液体1-丁基-3-甲基咪唑氯([Bmim]Cl)溶解PH-101微晶纤维素,通过不同的再生方法获得两种再生的纤维素,并利用XRD确定其结晶度,场发射扫描电镜(SEM)获得其形貌特征,热重(TG)分析表征其热稳定性.采用Py-GC/MS 对不同结晶度纤维素进行快速热解,并对热解挥发分进行在线分析,观察结晶度对纤维素热解特性的影响.研究表明左旋葡聚糖产率随结晶度降低而减少,而小分子产物随结晶度降低而增多.

关键词: 纤维素, 结晶, 结晶度, 离子液体, 热解, 热解特性