共查询到19条相似文献，搜索用时 265 毫秒
1.
2.
3.
文章研究了羟乙基纤维素基高吸水性材料的合成及其性能.以过硫酸钾-亚硫酸氧钠为引发荆,N,N-亚甲基双丙烯酰胺为交联剂,采用溶液聚合法合成了聚丙烯酸/羟乙基纤维素吸水树脂.研究了交联剂、引发剂、羟乙基纤维素用量及丙烯酸中和度等因素对吸水树脂吸液率的影响.实验结果表明,最佳反应条件是:羟乙基纤维素质量含量为8%,丙烯酸中和度为60%,交联剂和引发荆质量含量分别为0.2%和0.70%.高吸水性树脂吸蒸馏水和生理盐水分别为556倍和64倍. 相似文献
4.
纤维素分解菌的分离、筛选及其环境适应性初步研究 总被引：14，自引：0，他引：14
以滤纸平板和羧甲基纤维素钠培养基为基础培养基,从采集的样品中筛选出具有分解纤维素能力的38株菌株。采用纤维素刚果红培养基进行粗选,得到10株透明圈较大的菌株。将这10株菌株进行液体发酵培养,测定其酶活力,得到4株分解纤维素能力较强的菌株。对这4株菌株进行碳源、温度、pH值的适应性研究。结果发现,真菌3和真菌6的适应性都比较好。 相似文献
6.
7.
传统粘胶再生纤维素纤维作为纺织用纤维材料，已经有100多年的历史。2003年，我国再生粘胶纤维素纤维的生产总量已经达到380万吨。目前我国粘胶纤维素纤维的生产能力在全球再生纤维素纤维生产总量中都有举足轻重的地位。在新的世纪里，传统古老的粘胶纤维素纤维，仍然被纺织化学纤维界专家看作是很有生命力的纺织必用材料。 相似文献
8.
天然纤维素在生物降解过程中超分子结构的变化 总被引：1，自引：0，他引：1
纤维素是植物光合作用的主要产物,是地球上最丰富的可再生性能源物质,微生物对它的降解是自然界碳素循环的主要环节。对这个过程的有效利用可望为农业、畜牧业、发酵工业以及化学工业等持续提供廉价原料,对防治环境污染和建立良性生态系统也会发挥重要作用。作为植物的结构性材料,由β-1,4-糖苷键联结葡萄糖苷构成的纤维素,具有很难被微生物降解的特性,与由α-1,4-糖苷键联结葡萄糖苷组成的淀粉相比,纤维素酶的分子转换率要较淀粉酶低约两个数量级。 相似文献
10.
纤维素schiff碱是一种环保的纤维素衍生物,在很多行业具有很大的发展潜力。文章简述了纤维素schiff碱结构、性质及应用。 相似文献
11.
纤维素是自然界中最丰富的可再生资源,广泛应用于生产生活诸多领域。文章简单介绍了纤维素性质结构、原料来源,并着重介绍其功能化过程,功能材料与生物功能材料的种类,以及在各行各业中的应用,展示了其广阔的发展前景。 相似文献
12.
Qing-Fang Guan Zi-Meng Han Tong-Tong Luo Huai-Bin Yang Hai-Wei Liang Si-Ming Chen Guang-Sheng Wang Shu-Hong Yu 《国家科学评论(英文版)》2019,6(1):64
Although a variety of nanoparticles with better-than-bulk material performances can be synthesized, it remains a challenge to scale the extraordinary properties of individual nanoscale units to the macroscopic level for bulk nanostructured materials. Here, we report a general and scalable biosynthesis strategy that involves simultaneous growth of cellulose nanofibrils through microbial fermentation and co-deposition of various kinds of nanoscale building blocks (NBBs) through aerosol feeding on solid culture substrates. We employ this biosynthesis strategy to assemble a wide range of NBBs into cellulose nanofibril-based bulk nanocomposites. In particular, the biosynthesized carbon nanotubes/bacterial cellulose nanocomposites that consist of integrated 3D cellulose nanofibril networks simultaneously achieve an extremely high mechanical strength and electrical conductivity, and thus exhibit outstanding performance as high-strength lightweight electromagnetic interference shielding materials. The biosynthesis approach represents a general and efficient strategy for large-scale production of functional bulk nanocomposites with enhanced performances for practical applications. Industrial-scale production of these bulk nanocomposite materials for practical applications can be expected in the near future. 相似文献
13.
14.
15.
Huai-Ling Gao Ran Zhao Chen Cui Yin-Bo Zhu Si-Ming Chen Zhao Pan Yu-Feng Meng Shao-Meng Wen Chuang Liu Heng-An Wu Shu-Hong Yu 《国家科学评论(英文版)》2020,7(1):73
Bio-sourced nanocellulosic materials are promising candidates for spinning high-performance sustainable macrofibers for advanced applications. Various strategies have been pursued to gain nanocellulose-based macrofibers with improved strength. However, nearly all of them have been achieved at the expense of their elongation and toughness. Inspired by the widely existed hierarchical helical and nanocomposite structural features in biosynthesized fibers exhibiting exceptional combinations of strength and toughness, we report a design strategy to make nanocellulose-based macrofibers with similar characteristics. By combining a facile wet-spinning process with a subsequent multiple wet-twisting procedure, we successfully obtain biomimetic hierarchical helical nanocomposite macrofibers based on bacterial cellulose nanofibers, realizing impressive improvement in their tensile strength, elongation and toughness simultaneously. The achievement certifies the validity of the bioinspired hierarchical helical and nanocomposite structural design proposed here. This bioinspired design strategy provides a potential platform for further optimizing or creating many more strong and tough nanocomposite fiber materials for diverse applications. 相似文献
16.
纤维素作为世界上最丰富的可再生资源,将纤维素功能化是人们研究的热点之一,文章综述了纤维素智能化的设计原理、纤维素智能材料的种类、智能化研究进展。 相似文献
17.
18.
19.
文章介绍了几种纤维素类手性拆分剂以及其制备方法相关分离机理,综述了纤维素手性拆分剂的分离机理及其应用,重点地介绍纤维素手性固定相和纤维素膜的应用。 相似文献