纤维素膜在离子液体中的制备及性能研究

发布时间：2018-01-12 06:18

  本文关键词：纤维素膜在离子液体中的制备及性能研究　出处：《内蒙古农业大学》2016年硕士论文　论文类型：学位论文

  更多相关文章： 木质纤维素 离子液体 再生纤维素膜 TiO_2 复合膜

【摘要】：本文以木质纤维素为原材料,[AMIM]C1和[BMIM]Cl两种咪唑型离子液体为溶剂,对其进行溶解性能研究；于[BMIM]C1离子液体中制备了纤维素膜,将其与NaOH/硫脲／尿素／水体系和氯化锂/DMAc体系制备的纤维素膜相比较,选出最适合制备纤维膜的溶剂体系,于其中制备二氧化钛／纤维素复合膜,并对其进行相应的研究。主要内容如下：1.研究了[AMIM]C1和[BMIM]C1两种离子液体对木质纤维素的溶解性能。结果表明,在对木质纤维素分子链破坏最小的情况下,[BMIM]C1离子液体对木质纤维素的溶解性能优于[AMIM]C1。纤维素在两种离子液体中溶解再生后没有发生衍生化反应,晶型由纤维素Ⅰ型变为Ⅱ型结构,并且结晶度和聚合度都有所降低。2.在NaOF/硫脲/尿素,水溶解体系、氯化锂/DMAc溶解体系和[BMIM]C1离子液体三种溶解体系中制备再生纤维素膜,研究发现,[BMIM]C1离子液体中再生的纤维素膜具有较高的聚合度、较好的柔韧性,且平整度高以及透明度好等优势,其拉伸强度可达79.1MPa,但是热稳定性较低。3.采用TEMPO氧化方法对纤维素结构单元上C6上的羟基进行氧化,同时利用凝胶-溶胶法成功制备了纳米TiO2,将其沉积在羧基化纤维素的表面,于[BMIM]C1离子液体中制备了TiO2/纤维素复合膜。结果表明：加入Ti02粒子后,复合膜对紫外线具有较强的吸收,但是薄膜的亲水性和力学性能随着TiO2粒子的增加呈下降趋势。
[Abstract]:In this paper, lignocellulose was used as raw material. [AMIM] C1 and. [BMIM] Cl two imidazole-type ionic liquids were used as solvents to study their solubility. [Cellulose membranes were prepared in BMIM] C1 ionic liquids and compared with cellulose membranes prepared in NaOH / thiourea / urea / water system and lithium chloride / DMAc system. The best solvent system for preparing fiber membrane was selected to prepare titanium dioxide / cellulose composite membrane, and the corresponding research was carried out. The main contents were as follows: 1. [AMIM] C1 and. [The solubility of BMIM] C1 ionic liquids to lignocellulose was studied. The results showed that, when the molecular chain of lignocellulose was destroyed least, [The solubility of BMIM] C1 ionic liquid to lignocellulose is better than that of Cellulose. [AMIM] C1.Cellulose was dissolved and regenerated in two kinds of ionic liquids without derivatization reaction, and the crystal form changed from cellulose type 鈪，

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