共查询到14条相似文献,搜索用时 93 毫秒
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离子液体是纤维素的有效溶剂,可以实现快速溶解。以离子液体生产的再生纤维素纤维较多地保留了纤维素的天然特性,易于生物降解,产品性能优于传统的粘胶工艺。介绍了离子液体的物性、作为纤维素溶剂的优点、对纤维素的溶解机理、纺丝原液制备及纺丝工艺。 相似文献
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蔡涛 《纤维素科学与技术》2011,19(4):22-27
采用离子液体1-乙基-3-甲基咪唑醋酸盐([EMIM]Ac)为溶剂,制备了纤维素/[EMIM]Ac溶液,研究了该体系的流变性能,利用干喷湿纺的方式制备的新型再生纤维素纤维,并对纤维的结构与性能进行了分析。结果表明,纤维素/[EMIM]Ac溶液为典型的切力变稀流体,在较高剪切速率下,纺丝溶液的黏度变化较小;由该体系制备的新型再生纤维素纤维具有纤维素Ⅱ晶型的结构;随着拉伸比的提高,纤维的取向程度及结晶度增大,纤维力学性能提高。以离子液体为溶剂制备的再生纤维素纤维表面光滑,质地紧密。 相似文献
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首先概述了再生纤维素纤维制造技术的发展历史,总结了以天然纤维素为原料的黏胶纤维、Lyocell纤维和离子液体纤维(Ioncell)及其技术发展现状。重点介绍了这三种再生纤维素纤维的性能、应用领域及市场前景,并比较了其生产工艺,包括纺丝原液的制备、纺丝工艺、溶剂回收等。与黏胶纤维相比,Lyocell 纤维和Ioncell纤维在溶解纤维素及干喷湿纺纺丝方面具有独特的优势。进一步对该类技术的重点和难点,如纺丝原液的连续制备和溶剂的高效回收进行了分析。与Lyocell纤维使用的NMMO溶剂相比,Ioncell纤维使用的离子液体具有离子液体可设计等优点,可根据纤维素原料的不同来源,设计合成对纤维素具有更好的溶解能力而无降解特征且环境友好的离子液体溶剂,同时对温度、金属离子具有很好的稳定性,为发展新一代纤维素绿色制造技术提供了新途径。另外,对Ioncell纤维存在的问题也进行了详细的分析,提出了未来拟开展的重点研究方向和拟解决的关键难题。 相似文献
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两种咪唑型离子液体对纤维素的溶解及纺丝性能的比较 总被引:4,自引:2,他引:2
以1-乙基-3-甲基咪唑醋酸盐([EMIM]Ac)和1-丁基-3-甲基咪唑氯盐([BMIM]CI)两种咪唑型离子液体为溶剂,研究比较了它们对纤维素的溶解性能及其溶液的纺丝加工性能。结果发现:两种离子液体均能在一定条件下溶解纤维素,但[EMIM]Ac较[BMIM]Cl对纤维素具有更低的溶解温度和更快的溶解速率。从流变分析还发现:纤维素/[EMIM]Ac溶液与纤维素/[BMIMCl溶液均为切力变稀流体,相同条件下纤维素/[EMIM]Ac溶液的黏度远低于纤维素/[BMIM]Cl溶液,使其可在相对低的温度下纺丝。此外,GPC分析结果表明:纤维素在用[EMIM]Ac溶解及纺丝过程中降解程度较小,而用[BMIM]Cl进行溶解纺丝时,降解作用则较明显。对纤维结构与力学性能的分析结果进一步表明:与相同喷头拉伸比下制得的[EMIM]Ac法再生纤维素纤维相比,[BMIM]Cl法再生纤维素纤维的聚集态结构相对较完善,结晶度与取向度更高些,从而使其力学性能也相对较好。 相似文献
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将羊毛脱脂去除后溶解,制备蛋白质溶液,再与纤维素粘胶溶液混合制成纺丝溶液,以适当的纺丝凝固溶纺制蛋白质纤维素纤维。 相似文献
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以离子液体为溶剂的纤维素纤维的结构与性能 总被引:1,自引:0,他引:1
以离子液体氯化1-丁基-3-甲基咪唑([BMIM]Cl)为溶剂,制备了纤维素/[BMIM]Cl溶液,探讨了该体系的流变性能,并对所纺得的纤维素纤维的结构与性能进行了分析。结果表明:纤维素/[BMIM]Cl溶液为切力变稀流体,当剪切速率较大时,温度对体系黏度几乎没有影响,因此可以在较高剪切速率下降低纺丝温度;由该体系纺制的纤维具有纤维素II晶型的结构;随着拉伸比的提高,纤维的取向程度及结晶度增大,从而使纤维力学性能提高,所得纤维的表面光滑、结构致密,其染色性能及抗原纤化性能与Lyocell纤维基本相近。从而证明了用离子液体[BMIM]Cl所纺制的纤维素纤维性能良好,可望成为继Lyocell纤维之后的又一新型绿色纤维素纤维。 相似文献
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The processing of cellulose dissolved in ionic liquids (ILs) enables the development of new materials. Besides the established production of cellulosic fiber products, interesting technical applications are developed like super micro filament fibers, cellulose/chitin blend fibers, precursors for carbon fibers, and all‐cellulose composites. This review provides a detailed summary of these new developments and describes how ILs are selected for the processing of cellulose with a particular emphasis on industrial realization. State‐of‐the‐art spinning processes are reviewed and it is illustrated how uniquely selected ILs can be used not only for established fiber spinning but for the development of new cellulose‐based materials. 相似文献
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The acetylation of cellulose in ionic liquids (ILs) and the subsequent dry/wet spinning of these processing solutions were investigated. The homogeneous acetylation in ILs was carried out using different molar ratios of acetic anhydride to the anhydroglucose unit (AGU). The obtained solutions of cellulose acetates were characterised analytically by means of rheological methods. DS and of the prepared cellulose acetates were determined. Furthermore the processing solutions of the acetylation were shaped by means of a dry/wet spinning process to fibres with varied properties. The resulting fibre properties were discussed in consideration of the DS and in comparison with unsubstituted cellulose fibres.
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In this study, 1-ethyl-3-methylimidazolium diethyl phosphate, having the advantages of regulating the performance of cellulose dissolution and degradation, simplicity in synthesis, is chosen as solvent to dissolve wood pulp cellulose for regenerated cellulose fibers (RCFs) manufacture using dry-jet wet spinning equipment. The effect of draw ratios on RCFs’ mechanical properties in three bathes, including coagulation bath, stretch bath, and washing bath is investigated and a series of RCFs with high strength are obtained. The morphology, crystallinity, thermal stability, and dyeing behavior of the prepared RCFs are analyzed and discussed. More importantly, the biocompatibility of the RCFs, which is first performed, demonstrated that the toxicity of RCFs is as low as the viscose fibers. These RCFs could be easily dyed by natural turmeric and antibacterial fibers are obtained finally. In conclusion, this work provides tools for achievement of RCFs with good strength and environmental friendliness by changing the draw ratios, and also further develops a new green process for fabricating RCFs based on ionic liquids. 相似文献
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Mehmet Isik Haritz Sardon David Mecerreyes 《International journal of molecular sciences》2014,15(7):11922-11940
Due to its abundance and a wide range of beneficial physical and chemical properties, cellulose has become very popular in order to produce materials for various applications. This review summarizes the recent advances in the development of new cellulose materials and technologies using ionic liquids. Dissolution of cellulose in ionic liquids has been used to develop new processing technologies, cellulose functionalization methods and new cellulose materials including blends, composites, fibers and ion gels. 相似文献