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| 微晶纤维素制备过程中纤维素结构与形态特征的变化 |
| Changes of Structure and Morphological Characteristics of Cellulose during Preparation of Microcrystalline Cellulose |
| 收稿日期： |
| DOI：10.11980/j.issn.0254-508X.2016.06.006 |
| 关键词: 水解纤维素 选择性 结晶度 形态 结晶区 无定形区 |
| Key Words:hydrocellulose selectivity crystallinity morphology crystalline region amorphous region |
| 基金项目:教育部高校博士点专项基金(20126125130001)；陕西科技大学博士启动基金(BJ13-02)；陕西省大学生创新创业训练计划项目(1189)。 |
| 作者 | 单位 | | 张美云 | 陕西科技大学轻工与能源学院,陕西省造纸技术及特种纸品开发重点实验室,陕西西安,710021 | | 强丹丹* | 陕西科技大学轻工与能源学院,陕西省造纸技术及特种纸品开发重点实验室,陕西西安,710021 | | 李金宝 | 陕西科技大学轻工与能源学院,陕西省造纸技术及特种纸品开发重点实验室,陕西西安,710021 | | 吴修莉 | 陕西科技大学轻工与能源学院,陕西省造纸技术及特种纸品开发重点实验室,陕西西安,710021 |
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| 摘要:纤维素的超分子结构是由分子链排列整齐、有规则的结晶区和分子链排列松散、无规则的无定形区交错结合组成的。通过研究HCl在不同反应时间阶段(20～120 min)降解纤维素的特性,在HCl浓度2.5 mol/L,反应温度80℃,固液比1∶15,搅拌器转速120 r/min的条件下,纤维素选择性酸水解的最佳反应时间为60 min,此条件下水解纤维素的得率达96.04%,纤维素的聚合度、结晶度由661、58.92%变为99、76.01%。此外,长纤维和细小纤维平均长度分别为288、59 μm,细小纤维含量达90.31%。 |
| Abstract:The supramolecular structure of cellulose is consisted of the crystalline region and amorphous region, the molecular chains of the former are well-regulated, while that of the latter are ruleless. Based on the study of the properties of cellulose degraded by HCl in different reaction time stages (20～120 min), under the constant condition of HCl concentration 2.5 mol/L, reaction temperature 80℃, solid-to-liquid ratio 1∶15, rotating speed 120 r/min, the optimal reaction time was 60 min for selective hydrolysis of cellulose. The results showed that the yield of hydrocellulose could reach to 96.04%, its polymerization degree and crystallinity charged from 661 and 58.92% before hydrolysis to 99 and 76.01%, respectively, under the optimal reaction time of 60 min. Furthermore, the average length of fibers and fines were 288 μm, 59 μm, respectively, and the fines content reached to 90.13%. |
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