Morphology and mechanical properties of chitosan fibers obtained by gel-spinning: Influence of the dry-jet-stretching step and ageing
Morphology and mechanical properties of chitosan fibers obtained by gel-spinning: Influence of the dry-jet-stretching step and ageing
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DOI：
10.1016/j.actbio.2006.03.003
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发表时间：
2006-07-01
影响因子：
9.7
通讯作者：
Domard, Alain
中科院分区：
文献类型：
--
作者：
Notin, Laure;Viton, Christophe;Domard, Alain
报道了用凝胶纺丝法制备的壳聚糖纤维的形态结构和力学性能。目的是了解如何通过干喷拉伸步骤来改变纤维的微观结构以及如何改善机械性能。将来自鱿鱼围栏的具有高重均分子量（M-w = 540000 g/mol）的高度脱乙酰壳聚糖（乙酰化度= 2.7%）溶解在乙酸水溶液中，使用气态氨作为凝结剂进行纺丝，然后在热空气下直接干燥。需要1周的“后干燥”以使纤维在环境气氛中稳定。在单丝凝固过程中应用的干喷拉伸比（最大值为4.3）允许我们增加密度并有利于链沿着纤维轴的取向。这使我们能够改善纤维的机械性能（杨氏模量为82克/旦尼尔，韧度为2克/旦尼尔）。在环境气氛中的老化发挥了重要的作用，在晶体的微观结构中的关系：乙酸铵水解的动力学，形成一个弱的部分的无水异形的壳聚糖，和结晶度指数的增加，而杨氏模量增加，韧性略有降低。另外。凝胶喷射拉伸或干法喷射拉伸的纤维可以在环境大气中储存至少3个月而没有任何显著的降解。(c)2006 Acta Materialia Inc.由爱思唯尔有限公司出版。保留所有权利。
The morphology and mechanical properties of chitosan fibers obtained by gel-spinning are reported. The objectives were both to understand how the microstructure of the fibers could be modified and how the mechanical properties were improved by means of a dry-jet-stretching step. A highly deacetylated chitosan (degree of acetylation = 2.7%) from squid-pens, with a high weight-average molecular weight (M-w = 540000 g/mol) was dissolved in an aqueous acetic acid solution, spun using gaseous ammonia as the coagulant, and then directly dried under hot air. A "post-drying" of 1 week was necessary to stabilize the fibers in ambient atmosphere. A dry-jet-stretching ratio applied during the monofilament coagulation (maximal value of 4.3) allowed us to increase the density and favor the orientation of chains along the fiber axis. This allowed us to improve the mechanical properties of the fibers (Young's modulus of 82 g/denier and tenacity of 2 g/denier). The ageing in ambient atmosphere played an important role in the crystalline microstructure in relation to: the kinetics of ammonium acetate hydrolysis, the formation of a weak fraction of the anhydrous allomorph of chitosan, and an increase of the crystallinity index, whereas the Young's modulus was increased and the tenacity was slightly lowered. In addition. gel-jet-stretched or dry-jet-stretched fibers could be stored at least 3 months in ambient atmosphere without any significant degradation. (c) 2006 Acta Materialia Inc. Published by Elsevier Ltd. All rights reserved.